STRINGS AND STRINGBUILDERS. Spring 2019
|
|
- Andrew Dennis
- 5 years ago
- Views:
Transcription
1 STRINGS AND STRINGBUILDERS Spring 2019
2 STRING BASICS In Java, a string is an object. Three important pre-built classes used in string processing: the String class used to create and store immutable strings the StringBuilder class strings that can be modified the StringTokenizer class a utility class used to extract tokens from a string
3 THE String CLASS Part of the java.lang package 13 constructors and nearly 50 methods API from Oracle full listing of class features Strings are immutable, which means that once you build a String object, it is fixed it cannot be changed The only methods that can alter or set the instance variables are the constructors. Any non-constructor method that seems to change a string actually returns a new String object You can assign a String reference variable to a new string, discarding the old one
4 CONSTRUCTING A STRING One constructor allows you to use a string literal as a parameter. Examples: String greeting = new String( Hello, World! ); String subject = new String( Math ); You can also use the following shorthand notation: String sentence = The quick brown fox sat around for a while ;
5 COMMON String CLASS METHODS equals() returns true if two strings are the same, false otherwise if (str1.equals(str2)) System.out.print( The strings are the same ); compareto() good for comparing two strings, good for sorting (similar to strcmp in C) if (str1.compareto(str2) < 0) System.out.print("str1 comes before str2 in lexicographic ordering"); else if (str1.compareto(str2) == 0) System.out.print("str1 is the same as str2"); else if (str1.compareto(str2) > 0) System.out.print("str2 comes before str1 in lexicographic ordering"); equalsignorecase() just like equals()except the case doesn t matter in making a match. There are other comparison methods such as regionmatches, startswith, and endswith. See the API for details. Note: Don t try to compare strings using ==, <, >, etc. This only compares their reference variables, not the objects themselves Here is an example of string comparisons (note: comparisons are lexicographic ordering, not alphabetic)
6 COMMON String CLASS METHODS concat() Returns a concatenation of two strings String s1 = "Dog"; String s2 = "food"; String s3 = s1.concat(s2); // s3 now stores the string //"Dogfood" // note: s1 and s2 are NOT changed The + symbol also performs concatenation String s1 = "Cat"; String s2 = "nap"; String s3 = s1 + s2; // s3 now stores "Catnap //(s1 and s2 unchanged)
7 COMMON String CLASS METHODS substring() extracts part of a string and returns it. Takes two parameters (begin index and end index) or 1 parameter (begin index). Strings are 0 -indexed. Substring returned is [begin, end). String s1 = "Hello, World"; String s2 = s1.substring(0,5); // s2 is now "Hello". // picks up indices 0 4 String s3 = s1.substring(0,7) + "Dolly"; System.out.print(s3); // prints "Hello, Dolly" System.out.print(s3.substring(4)); // prints "o, Dolly" // can even use substring on string literals String s4 = "What's up doc?".substring(10,13); // s4 = "doc" length() return s a string s length (number of characters)
8 COMMON String CLASS METHODS charat() returns the character at a given index String s1 = "Rumplestiltskin"; System.out.print(s1.charAt(5)); // output: e Some conversion methods tolowercase() returns lower case version of string touppercase() returns upper case version of string trim() returns a string that eliminates leading and trailing blank characters replace() returns a string with one character replaced with a new one String s1 = "Zebra"; String s2 = s1.tolowercase(); // s2 is "zebra" String s3 = s1.touppercase(); // s3 is "ZEBRA" String s4 = " Apple "; String s5 = s4.trim(); // s5 is "Apple" String s6 = s5.replace('e', 'y'); // s6 is "Apply"
9 COMMON String CLASS METHODS valueof() There are several overloaded versions of this. They are static methods used for converting other values to String objects int x = 12345; String s7 = String.valueOf(4.56); // s7 is "4.56" String s8 = String.valueOf(16); // s8 is "16" String s9 = String.valueOf(x); // s9 is "12345" format() Static method that takes 1 or more parameters that returns a String formatted as if you had passed the parameters to a call to printf() isempty() Returns true if the string is the empty string (length of 0) isblank() Returns true if the string contains only whitespace characters This example has some String class method calls
10 SWITCH STATEMENTS Beginning with Java 7, you are allowed to use a String object in the expression of a switch statement This means you can also use String literals for the case labels Each case label is compared to the String object using the String.equals() method
11 THE StringBuilder CLASS Part of java.lang package API from Oracle full listing of class features A StringBuilder object is mutable (can be changed) StringBuilder objects have both length (number of characters) and capacity (current memory allocated) Some example constructions: // creates an empty string buffer with initial capacity of 16 // characters StringBuilder buf1 = new StringBuilder(); // creates empty string buffer with initial capacity given in // parameter StringBuilder buf2 = new StringBuilder(50); // creates string buffer filled with argument -- initial capacity // is length of given string plus 16 StringBuilder buf3 = new StringBuilder("Hello, World");
12 COMMON StringBuilder CLASS METHODS append() adds data to string in the buffer, several versions for different parameter types (see API for full set) StringBuilder buf1 = new StringBuilder(); buf1.append("hello"); buf1.append(','); buf1.append(" world!"); // buf1 is now "Hello, world!" buf1.append(' '); buf1.append(123.45); // buf1 is now "Hello, world! " insert() inserts data at a certain starting index. Multiple versions for different data types StringBuilder buf2 = new StringBuilder(); buf2.append("welcome home"); // buf2 now "Welcome home" buf2.insert(8,"to my humble "); // buf2 = "Welcome to my humble home"
13 COMMON StringBuilder CLASS METHODS delete(begin, end) deletes data from a string buffer StringBuilder buf3 = new StringBuilder("abcdefghijklm"); buf3.delete(4,9); // deletes indices 4-8. // buf3 is now "abcdjklm" deletecharat() delete a character at a specified index StringBuilder buf4 = new StringBuilder("abcdefg"); buf4.deletecharat(3); // buf4 is now "abcefg" buf4.deletecharat(1); // buf4 is now "acefg" Here is an example containing some inserts and deletes
14 COMMON StringBuilder CLASS METHODS reverse() reverses the contents of the string buffer setcharat() sets a character at the specified index (similar to deletecharat) capacity() returns the capacity of the buffer length() returns the length of the current string in buffer (<= capacity) setlength() sets the exact length of the string in the buffer to the new value (parameter). This is the string itself, not the capacity. If the new length is smaller than previous length, characters are truncated. If new length is bigger, null characters are appended. charat() returns character at a specified index (parameter)
15 THE StringTokenizer CLASS Part of java.util package API from Oracle full listing of class features The tokens are chunks of the string broken apart based on a set of delimiters Class contains methods that allow specifying the delimiter characters, separating a string into tokens, and counting the tokens
16 THE StringTokenizer CLASS Example usage: String s1 = "The quick brown fox jumped over the lazy dog."; StringTokenizer st = new StringTokenizer(s1); // default delimiters are space, tab, newline, carriage return System.out.print("Number of words = " + st.counttokens()); // prints "Number of words = 9" String s2 = st.nexttoken(); String s3 = st.nexttoken(); String s4 = st.nexttoken(); // s2 = "The" // s3 = "quick" // s4 = "brown You can also tokenize strings without using a tokenizer if you want to use the default delimiters Example of tokenizing a string without a tokenizer
17 COMMAND LINE ARGUMENTS Recall that the main method of a Java program looks like this: public static void main(string[] args) The String[] args part allows a set of arguments to be passed into the program from the command line. Suppose we execute the following command: java MyProgram file1.txt output lazy Inside the main program, the arguments are stored in an array of strings: args[0] is file1.txt args[1] is output args[2] is lazy args.length stores the number of parameters passed (3 here) More String examples (Deitel chapter 14)
Intro to Strings. Lecture 7 COP 3252 Summer May 23, 2017
Intro to Strings Lecture 7 COP 3252 Summer 2017 May 23, 2017 Strings in Java In Java, a string is an object. It is not a primitive type. The String class is used to create and store immutable strings.
More informationMore on Strings. Lecture 10 CGS 3416 Fall October 13, 2015
More on Strings Lecture 10 CGS 3416 Fall 2015 October 13, 2015 What we know so far In Java, a string is an object. The String class is used to create and store immutable strings. Some String class methods
More informationIntro to Strings. Lecture 7 CGS 3416 Spring February 13, Lecture 7 CGS 3416 Spring 2017 Intro to Strings February 13, / 16
Intro to Strings Lecture 7 CGS 3416 Spring 2017 February 13, 2017 Lecture 7 CGS 3416 Spring 2017 Intro to Strings February 13, 2017 1 / 16 Strings in Java In Java, a string is an object. It is not a primitive
More informationString. Other languages that implement strings as character arrays
1. length() 2. tostring() 3. charat() 4. getchars() 5. getbytes() 6. tochararray() 7. equals() 8. equalsignorecase() 9. regionmatches() 10. startswith() 11. endswith() 12. compareto() 13. indexof() 14.
More informationAssoc. Prof. Marenglen Biba. (C) 2010 Pearson Education, Inc. All rights reserved.
Assoc. Prof. Marenglen Biba (C) 2010 Pearson Education, Inc. All Advanced Java This chapter discusses class String, class StringBuilder and class Character from the java.lang package. These classes provide
More informationAssoc. Prof. Marenglen Biba. (C) 2010 Pearson Education, Inc. All rights reserved.
Assoc. Prof. Marenglen Biba (C) 2010 Pearson Education, Inc. All This chapter discusses class String, from the java.lang package. These classes provide the foundation for string and character manipulation
More informationString related classes
Java Strings String related classes Java provides three String related classes java.lang package String class: Storing and processing Strings but Strings created using the String class cannot be modified
More informationLab 14 & 15: String Handling
Lab 14 & 15: String Handling Prof. Navrati Saxena TA: Rochak Sachan String Handling 9/11/2012 22 String Handling Java implements strings as objects of type String. Once a String object has been created,
More informationStrings. Strings and their methods. Dr. Siobhán Drohan. Produced by: Department of Computing and Mathematics
Strings Strings and their methods Produced by: Dr. Siobhán Drohan Department of Computing and Mathematics http://www.wit.ie/ Topics list Primitive Types: char Object Types: String Primitive vs Object Types
More informationJava Foundations: Unit 3. Parts of a Java Program
Java Foundations: Unit 3 Parts of a Java Program class + name public class HelloWorld public static void main( String[] args ) System.out.println( Hello world! ); A class creates a new type, something
More information2. All the strings gets collected in a special memory are for Strings called " String constant pool".
Basics about Strings in Java 1. You can create Strings in various ways:- a) By Creating a String Object String s=new String("abcdef"); b) By just creating object and then referring to string String a=new
More informationCreating Strings. String Length
Strings Strings, which are widely used in Java programming, are a sequence of characters. In the Java programming language, strings are objects. The Java platform provides the String class to create and
More informationCST242 Strings and Characters Page 1
CST242 Strings and Characters Page 1 1 2 3 4 5 6 Strings, Characters and Regular Expressions CST242 char and String Variables A char is a Java data type (a primitive numeric) that uses two bytes (16 bits)
More informationSTUDENT LESSON A10 The String Class
STUDENT LESSON A10 The String Class Java Curriculum for AP Computer Science, Student Lesson A10 1 STUDENT LESSON A10 The String Class INTRODUCTION: Strings are needed in many programming tasks. Much of
More informationString Objects: The string class library
String Objects: The string class library Lecture 23 COP 3014 Spring 2017 March 7, 2017 C-strings vs. string objects In C++ (and C), there is no built-in string type Basic strings (C-strings) are implemented
More informationStrings in Java String Methods. The only operator that can be applied to String objects is concatenation (+) for combining one or more strings.
The only operator that can be applied to String objects is concatenation (+) for combining one or more strings. Java also provides many methods with the String class to allow us to manipulate text. These
More informationAppendix 3. Description: Syntax: Parameters: Return Value: Example: Java - String charat() Method
Appendix 3 Java - String charat() Method This method returns the character located at the String's specified index. The string indexes start from zero. public char charat(int index) index -- Index of the
More informationClass Library java.lang Package. Bok, Jong Soon
Class Library java.lang Package Bok, Jong Soon javaexpert@nate.com www.javaexpert.co.kr Object class Is the root of the class hierarchy. Every class has Object as a superclass. If no inheritance is specified
More informationIntroductory Mobile Application Development
Notes Quick Links Introductory Mobile Application Development 152-160 Java Syntax Part 2 - Activity String Class Add section on Parse ArrayList Class methods. Book page 95. Toast Page 129 240 242 String
More informationFall 2017 CISC124 10/1/2017
CISC124 Today First onq quiz this week write in lab. More details in last Wednesday s lecture. Repeated: The quiz availability times will change to match each lab as the week progresses. Useful Java classes:
More informationCS 1301 Ch 8, Part A
CS 1301 Ch 8, Part A Sections Pages Review Questions Programming Exercises 8.1 8.8 264 291 1 30 2,4,6,8,10,12,14,16,18,24,28 This section of notes discusses the String class. The String Class 1. A String
More informationString is one of mostly used Object in Java. And this is the reason why String has unique handling in Java(String Pool). The String class represents
String is one of mostly used Object in Java. And this is the reason why String has unique handling in Java(String Pool). The String class represents character strings. All string literals in Java programs,
More informationChapter 12 Strings and Characters. Dr. Hikmat Jaber
Chapter 12 Strings and Characters Dr. Hikmat Jaber 1 The String Class Constructing a String: String message = "Welcome to Java ; String message = new String("Welcome to Java ); String s = new String();
More informationCS1150 Principles of Computer Science Math Functions, Characters and Strings (Part II)
CS1150 Principles of Computer Science Math Functions, Characters and Strings (Part II) Yanyan Zhuang Department of Computer Science http://www.cs.uccs.edu/~yzhuang CS1150 UC. Colorado Springs How to generate
More informationUSING LIBRARY CLASSES
USING LIBRARY CLASSES Simple input, output. String, static variables and static methods, packages and import statements. Q. What is the difference between byte oriented IO and character oriented IO? How
More informationAbout Codefrux While the current trends around the world are based on the internet, mobile and its applications, we try to make the most out of it. As for us, we are a well established IT professionals
More informationClass. Chapter 6: Data Abstraction. Example. Class
Chapter 6: Data Abstraction In Java, there are three types of data values primitives arrays objects actually, arrays are a special type of object Class In Java, objects are used to represent data values
More informationLecture Notes for CS 150 Fall 2009; Version 0.5
for CS 150 Fall 2009; Version 0.5 Draft! Do not distribute without prior permission. Copyright 2001-2009 by Mark Holliday Comments, corrections, and other feedback appreciated holliday@email.wcu.edu Chapter
More informationCS251L REVIEW Derek Trumbo UNM
CS251L REVIEW 2010.8.30 Derek Trumbo UNM Arrays Example of array thought process in Eclipse Arrays Multi-dimensional arrays are also supported by most PL s 2-dimensional arrays are just like a matrix (monthly
More informationIndex COPYRIGHTED MATERIAL
Index COPYRIGHTED MATERIAL Note to the Reader: Throughout this index boldfaced page numbers indicate primary discussions of a topic. Italicized page numbers indicate illustrations. A abstract classes
More informationChapter 10: Text Processing and More about Wrapper Classes
Chapter 10: Text Processing and More about Wrapper Classes Starting Out with Java: From Control Structures through Objects Fourth Edition by Tony Gaddis Addison Wesley is an imprint of 2010 Pearson Addison-Wesley.
More informationCPS 109 Lab 2 Alexander Ferworn Updated Fall 05. Ryerson University. School of Computer Science CPS109. Lab 2
Ryerson University Chapter 2: Using Objects Lab Exercises School of Computer Science CPS109 Lab 2 Objects, Classes and Methods 1. The String class provides methods that you can apply to String objects.
More informationA couple of decent C++ web resources you might want to bookmark:
CS106X Handout 10 Autumn 2012 September 28 th, 2012 C++ and CS106 Library Reference Written by Julie Zelenski and revised by Jerry. A couple of decent C++ web resources you might want to bookmark: http://www.cppreference.com
More informationChapter 29: String and Object References Bradley Kjell (Revised 06/15/2008)
Chapter 29: String and Object References Bradley Kjell (Revised 06/15/2008) In previous chapters, methods were called with parameters that were primitive data types. This chapter discusses how to use object
More informationFull file at
Java Programming: From Problem Analysis to Program Design, 3 rd Edition 2-1 Chapter 2 Basic Elements of Java At a Glance Instructor s Manual Table of Contents Overview Objectives s Quick Quizzes Class
More informationChapter 8 Strings. Chapter 8 Strings
Chapter 8 Strings Chapter 6 Arrays Chapter 7 Objects and Classes Chapter 8 Strings Chapter 9 Inheritance and Polymorphism GUI can be covered after 10.2, Abstract Classes Chapter 12 GUI Basics 10.2, Abstract
More informationJava Programming. String Processing. 1 Copyright 2013, Oracle and/or its affiliates. All rights reserved.
Java Programming String Processing 1 Copyright 2013, Oracle and/or its affiliates. All rights Overview This lesson covers the following topics: Read, search, and parse Strings Use StringBuilder to create
More informationOhad Barzilay and Oranit Dror
The String Class Represents a character string (e.g. "Hi") Implicit constructor: String quote = "Hello World"; string literal All string literals are String instances Object has a tostring() method More
More informationJava s String Class. in simplest form, just quoted text. used as parameters to. "This is a string" "So is this" "hi"
1 Java s String Class in simplest form, just quoted text "This is a string" "So is this" "hi" used as parameters to Text constructor System.out.println 2 The Empty String smallest possible string made
More informationMathematical Functions, Characters, and Strings. CSE 114, Computer Science 1 Stony Brook University
Mathematical Functions, Characters, and Strings CSE 114, Computer Science 1 Stony Brook University http://www.cs.stonybrook.edu/~cse114 1 Static methods Remember the main method header? public static void
More informationReview Chapters 1 to 4. Instructor: Scott Kristjanson CMPT 125/125 SFU Burnaby, Fall 2013
Review Chapters 1 to 4 Instructor: Scott Kristjanson CMPT 125/125 SFU Burnaby, Fall 2013 Introduction to Java Chapters 1 and 2 The Java Language Section 1.1 Data & Expressions Sections 2.1 2.5 Instructor:
More informationChapter 11 Object-Oriented Design Exception and binary I/O can be covered after Chapter 9
CHAPTER 8 STRINGS Chapter 6 Arrays Chapter 7 Objects and Classes Chapter 8 Strings Chapter 9 Inheritance and Polymorphism GUI can be covered after 10.2, Abstract Classes Chapter 12 GUI Basics 10.2, Abstract
More informationCS106X Handout 04 Winter 2018 January 8 th, 2018 C++ Strings
CS106X Handout 04 Winter 2018 January 8 th, 2018 C++ Strings C++ Strings Original handout written by Neal Kanodia and Steve Jacobson. One of the most useful data types supplied in the C++ libraries is
More informationAssignment 5: MyString COP3330 Fall 2017
Assignment 5: MyString COP3330 Fall 2017 Due: Wednesday, November 15, 2017 at 11:59 PM Objective This assignment will provide experience in managing dynamic memory allocation inside a class as well as
More informationStrings. Strings and their methods. Mairead Meagher Dr. Siobhán Drohan. Produced by: Department of Computing and Mathematics
Strings Strings and their methods Produced by: Mairead Meagher Dr. Siobhán Drohan Department of Computing and Mathematics http://www.wit.ie/ Topics list Primitive Types: char Object Types: String Primitive
More information5/23/2015. Core Java Syllabus. VikRam ShaRma
5/23/2015 Core Java Syllabus VikRam ShaRma Basic Concepts of Core Java 1 Introduction to Java 1.1 Need of java i.e. History 1.2 What is java? 1.3 Java Buzzwords 1.4 JDK JRE JVM JIT - Java Compiler 1.5
More informationLECTURE 15. String I/O and cstring library
LECTURE 15 String I/O and cstring library RECAP Recall that a C-style string is a character array that ends with the null character. Character literals in single quotes: 'a', '\n', '$ String literals in
More informationChapter 2 Part 2 Edited by JJ Shepherd, James O Reilly
Basic Computation Chapter 2 Part 2 Edited by JJ Shepherd, James O Reilly Parentheses and Precedence Parentheses can communicate the order in which arithmetic operations are performed examples: (cost +
More informationIntroduction to Computer Programming
Introduction to Computer Programming Lecture #8 - Stringing Along Using Character and String Data How Do Computer Handle Character Data? Like all other data that a computer handles, characters are stored
More informationSlide 1 CS 170 Java Programming 1 More on Strings Duration: 00:00:47 Advance mode: Auto
CS 170 Java Programming 1 More on Strings Working with the String class Slide 1 CS 170 Java Programming 1 More on Strings Duration: 00:00:47 What are Strings in Java? Immutable sequences of 0 n characters
More informationSearching and Strings. IST 256 Application Programming for Information Systems
Searching and Strings IST 256 Application Programming for Information Systems Searching for Strings In an array, we do a simple linear search for an item by going through the array in order from the first
More informationProgramming with Java
Programming with Java String & Making Decision Lecture 05 First stage Software Engineering Dep. Saman M. Omer 2017-2018 Objectives By the end of this lecture you should be able to : Understand another
More informationExam 1 Prep. Dr. Demetrios Glinos University of Central Florida. COP3330 Object Oriented Programming
Exam 1 Prep Dr. Demetrios Glinos University of Central Florida COP3330 Object Oriented Programming Progress Exam 1 is a Timed Webcourses Quiz You can find it from the "Assignments" link on Webcourses choose
More informationCSE1710. Big Picture. Today is last day covering Ch 6. Tuesday, Dec 02 is designated as a study day. No classes. Thursday, Dec 04 is last lecture.
CSE1710 Click to edit Master Week text 12, styles Lecture 23 Second level Third level Fourth level Fifth level Fall 2014! Thursday, Nov 27, 2014 1 Big Picture Today is last day covering Ch 6 Tuesday, Dec
More informationTEXT-BASED APPLICATIONS
Objectives 9 TEXT-BASED APPLICATIONS Write a program that uses command-line arguments and system properties Write a program that reads from standard input Write a program that can create, read, and write
More informationStrings! Today! CSE String Methods!
Strings CSE 1710 Lecture 14, 15 String Handling We have covered three chunks of material: Week 1: String Literals pp. 22-23; Fig 1.12; PT 1.8 Week 6: The String Class Section 6.1.1, pp. 219-220 The Masquerade
More informationMore on Strings. String methods and equality. Mairead Meagher Dr. Siobhán Drohan. Produced by: Department of Compu<ng and Mathema<cs h=p://www.wit.
More on Strings String methods and equality Produced by: Mairead Meagher Dr. Siobhán Drohan Department of Compu
More informationCharacters, Strings and Text Processing in Java
Characters, Strings and Text Processing in Java Concepts: Characters, Code Points, Encodings Unicode: A to Z and more Jonas Kvarnström.liu.se 2012 Jonas Kvarnström.liu.se 2012 Characters 3 Character Repertoires
More informationYou ll be reading more about tools for branching in Sections 3.4, and We are skipping Sections 3.5, 3.11 and 3.13-end of chapter.
CS 1050 - Preview for Session 6 You ll be reading more about tools for branching in Sections 3.4, 3.6-3.10 and 3.12. We are skipping Sections 3.5, 3.11 and 3.13-end of chapter. Section 3.4 Logical Operators
More informationMathematical Functions, Characters, and Strings. CSE 114, Computer Science 1 Stony Brook University
Mathematical Functions, Characters, and Strings CSE 114, Computer Science 1 Stony Brook University http://www.cs.stonybrook.edu/~cse114 1 Static methods Remember the main method header? public static void
More informationSYSC 2006 C Winter String Processing in C. D.L. Bailey, Systems and Computer Engineering, Carleton University
SYSC 2006 C Winter 2012 String Processing in C D.L. Bailey, Systems and Computer Engineering, Carleton University References Hanly & Koffman, Chapter 9 Some examples adapted from code in The C Programming
More informationANNA UNIVERSITY OF TECHNOLOGY COIMBATORE B.E./B.TECH DEGREE EXAMINATIONS: NOV/DEC JAVA PROGRAMMING
ANNA UNIVERSITY OF TECHNOLOGY COIMBATORE B.E./B.TECH DEGREE EXAMINATIONS: NOV/DEC 2010 080230021-JAVA PROGRAMMING 1. What are the Java Features? 1. Compiled and Interpreted 2. Platform Independent and
More informationC Style Strings. Lecture 11 COP 3014 Spring March 19, 2018
C Style Strings Lecture 11 COP 3014 Spring 2018 March 19, 2018 Recap Recall that a C-style string is a character array that ends with the null character Character literals in single quotes a, \n, $ string
More informationStrings. Strings, which are widely used in Java programming, are a sequence of characters. In the Java programming language, strings are objects.
Strings Strings, which are widely used in Java programming, are a sequence of characters. In the Java programming language, strings are objects. The Java platform provides the String class to create and
More informationC08c: A Few Classes in the Java Library (II)
CISC 3115 TY3 C08c: A Few Classes in the Java Library (II) Hui Chen Department of Computer & Information Science CUNY Brooklyn College 9/20/2018 CUNY Brooklyn College 1 Outline Discussed Concepts of two
More informationEngineering Problem Solving with C++, Etter
Engineering Problem Solving with C++, Etter Chapter 6 Strings 11-30-12 1 One Dimensional Arrays Character Strings The string Class. 2 C style strings functions defined in cstring CHARACTER STRINGS 3 C
More informationDiscussion 1H Notes (Week 4, April 22) TA: Brian Choi Section Webpage:
Discussion 1H Notes (Week 4, April 22) TA: Brian Choi (schoi@cs.ucla.edu) Section Webpage: http://www.cs.ucla.edu/~schoi/cs31 Passing Arguments By Value and By Reference So far, we have been passing in
More informationObjects and Classes 1: Encapsulation, Strings and Things CSC 121 Fall 2014 Howard Rosenthal
Objects and Classes 1: Encapsulation, Strings and Things CSC 121 Fall 2014 Howard Rosenthal Lesson Goals Understand objects and classes Understand Encapsulation Learn about additional Java classes The
More informationPace University. Fundamental Concepts of CS121 1
Pace University Fundamental Concepts of CS121 1 Dr. Lixin Tao http://csis.pace.edu/~lixin Computer Science Department Pace University October 12, 2005 This document complements my tutorial Introduction
More informationStrings. Upsorn Praphamontripong. Note: for reference when we practice loop. We ll discuss Strings in detail after Spring break
Note: for reference when we practice loop. We ll discuss Strings in detail after Spring break Strings Upsorn Praphamontripong CS 1111 Introduction to Programming Spring 2018 Strings Sequence of characters
More informationAny serious Java programmers should use the APIs to develop Java programs Best practices of using APIs
Ananda Gunawardena Java APIs Think Java API (Application Programming Interface) as a super dictionary of the Java language. It has a list of all Java packages, classes, and interfaces; along with all of
More informationAns: Store s as an expandable array of chars. (Double its size whenever we run out of space.) Cast the final array to a String.
CMSC 131: Chapter 21 (Supplement) Miscellany Miscellany Today we discuss a number of unrelated but useful topics that have just not fit into earlier lectures. These include: StringBuffer: A handy class
More informationProgramming Techniques
University of Malta Junior College Department of Computing and Information Technology Programming Techniques IT Advanced Level Course Notes Riccardo Flask 2 Programming Techniques IT Advanced Notes CONTENTS
More informationClasses Basic Overview
Final Review!!! Classes and Objects Program Statements (Arithmetic Operations) Program Flow String In-depth java.io (Input/Output) java.util (Utilities) Exceptions Classes Basic Overview A class is a container
More informationCMPT 125: Lecture 3 Data and Expressions
CMPT 125: Lecture 3 Data and Expressions Tamara Smyth, tamaras@cs.sfu.ca School of Computing Science, Simon Fraser University January 3, 2009 1 Character Strings A character string is an object in Java,
More informationMore non-primitive types Lesson 06
CSC110 2.0 Object Oriented Programming Ms. Gnanakanthi Makalanda Dept. of Computer Science University of Sri Jayewardenepura More non-primitive types Lesson 06 1 2 Outline 1. Two-dimensional arrays 2.
More informationCOMP 202. Built in Libraries and objects. CONTENTS: Introduction to objects Introduction to some basic Java libraries string
COMP 202 Built in Libraries and objects CONTENTS: Introduction to objects Introduction to some basic Java libraries string COMP 202 Objects and Built in Libraries 1 Classes and Objects An object is an
More informationScheme: Strings Scheme: I/O
Scheme: Strings Scheme: I/O CS F331 Programming Languages CSCE A331 Programming Language Concepts Lecture Slides Wednesday, April 5, 2017 Glenn G. Chappell Department of Computer Science University of
More informationTha Java Programming Language
Tha Java Programming Language Kozsik Tamás (2000-2001) kto@elte.hu http://www.elte.hu/~k to/ III. Arrays, collections and other baseclasses Some of the baseclasses Object String StringBuffer Integer, Double,...
More informationLists using LinkedList
Lists using LinkedList 1 LinkedList Apart from arrays and array lists, Java provides another class for handling lists, namely LinkedList. An instance of LinkedList is called a linked list. The constructors
More information- Thus there is a String class (a large class)
Strings - Strings in Java are objects - Thus there is a String class (a large class) - In a statement like this: System.out.println( Hello World ); the Java compiler creates a String object from the quoted
More informationUsing Java Classes Fall 2018 Margaret Reid-Miller
Using Java Classes 15-121 Fall 2018 Margaret Reid-Miller Today Strings I/O (using Scanner) Loops, Conditionals, Scope Math Class (random) Fall 2018 15-121 (Reid-Miller) 2 The Math Class The Math class
More informationCHAPTER 6 MOST COMMONLY USED LIBRARIES
LIBRARY CHAPTER 6 - A set of ready-made software routines (class definitions) that can be reused in new programs, is called a Library. - Some commonly used java libraries are : Math Library String Library
More informationCS112 Lecture: Characters and Strings
CS112 Lecture: Characters and Strings Objectives: Last Revised 3/21/06 1. To introduce the data type char and related basic information (escape sequences, Unicode). 2. To introduce the library classes
More informationwhat are strings today: strings strings: output strings: declaring and initializing what are strings and why to use them reading: textbook chapter 8
today: strings what are strings what are strings and why to use them reading: textbook chapter 8 a string in C++ is one of a special kind of data type called a class we will talk more about classes in
More informationappreciate the difference between a char and a string understand and use the String class methods
1 8 THE STRING CLASS Terry Marris 16 April 2001 8.1 OBJECTIVES By the end of this lesson the student should be able to appreciate the difference between a char and a string understand and use the String
More informationNotes from the Boards Set BN19 Page
1 The Class, String There are five programs in the class code folder Set17. The first one, String1 is discussed below. The folder StringInput shows simple string input from the keyboard. Processing is
More informationEng. Mohammed Abdualal
Islamic University of Gaza Faculty of Engineering Computer Engineering Department Computer Programming Lab (ECOM 2124) Lab 2 String & Character Eng. Mohammed Abdualal String Class In this lab, you have
More informationArray Initialization
Array Initialization Array declarations can specify initializations for the elements of the array: int primes[10] = { 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 ; initializes primes[0] to 2, primes[1] to 3, primes[2]
More informationCSE1710. Big Picture. Tuesday, Dec 02 is designated as a study day. No classes. Thursday, Dec 04 is last lecture.
CSE1710 Click to edit Master Week text 12, styles Lecture 22 Second level Third level Fourth level Fifth level Fall 2014 Tuesday, Nov 25, 2014 1 Big Picture Tuesday, Dec 02 is designated as a study day.
More informationBirkbeck (University of London) Software and Programming 1 In-class Test Mar 2018
Birkbeck (University of London) Software and Programming 1 In-class Test 2.1 22 Mar 2018 Student Name Student Number Answer ALL Questions 1. What output is produced when the following Java program fragment
More informationCharacter Strings COSC Yves Lespérance. Lecture Notes Week 6 Java Strings
COSC 1020 Yves Lespérance Character Strings A character string is a sequence of 0 or more characters. A string can contain a word, a sentence, or any amount of text. In Java, character strings are objects
More information8/25/17. Demo: Create application. CS2110, Recita.on 1. Arguments to method main, Packages, Wrapper Classes, Characters, Strings.
CS2110, Recita.on 1 Arguments to method main, Packages, Wrapper Classes, Characters, Strings Demo: Create application To create a new project that has a method called main with a body that contains the
More informationStrings and Loops CSE moodle.yorku.ca. moodle.yorku.ca CSE 1020
Strings and Loops CSE 1020 moodle.yorku.ca Strings Strings are immutable objects. The state of an immutable object cannot be changed. The String API does not contain any mutators. The StringBuffer class
More informationSOFTWARE DEVELOPMENT 1. Strings and Enumerations 2018W A. Ferscha (Institute of Pervasive Computing, JKU Linz)
SOFTWARE DEVELOPMENT 1 Strings and Enumerations 2018W (Institute of Pervasive Computing, JKU Linz) CHARACTER ENCODING On digital systems, each character is represented by a specific number. The character
More information1 Short Answer (10 Points Each)
1 Short Answer (10 Points Each) 1. Write a for loop that will calculate a factorial. Assume that the value n has been input by the user and have the loop create n! and store it in the variable fact. Recall
More informationGood Luck! CSC207, Fall 2012: Quiz 1 Duration 25 minutes Aids allowed: none. Student Number:
CSC207, Fall 2012: Quiz 1 Duration 25 minutes Aids allowed: none Student Number: Last Name: Lecture Section: L0101 First Name: Instructor: Horton Please fill out the identification section above as well
More informationCS61B Lecture #3. Homework: Please see Homework #1 on the lab page. Last modified: Wed Sep 10 20:34: CS61B: Lecture #3 1
CS61B Lecture #3 Reading: Please read Chapter4of the readerajava Reference for Friday (on Values, Types, and Containers). Labs: We are forgiving during the first week, but try to get your lab1 submitted
More informationJava String Java String provides a lot of concepts that can be performed on a string such as compare, concat, equals, split, length, replace,
Java String Java String provides a lot of concepts that can be performed on a string such as compare, concat, equals, split, length, replace, compareto, intern, substring etc. In java, string is basically
More informationUse of objects and variables
Unit 2 Use of objects and variables Summary Objects and classes The class String Method invocation Variables Assignment References to objects Creation of objects: invocation of constructors Immutable and
More information