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1 Why Java? Lecture 2: Intro to Java Java features.! Widely available.! Widely used.! Variety of automatic checks for mistakes in programs.! Embraces full set of modern abstractions. Caveat.! No perfect language. Our approach.! Minimal subset of Java.! Develop general programming skills that are applicable to C, C++, C#, Python, Matlab, FORTRAN, A Subset of the Java Language Types System int double System.out.println() long System.out.print() char System.exit() Primitive Numeric Types Parsing + - * Integer.parseInt() / % + Double.parseDouble() + Long.parseLong() -- > < <= >= = = Boolean << >> && & ^! =! == Math Library Math.sin() Math.cos() Math.log() Math.exp() Math.sqrt() Math.pow() Math.min() Math.max() Math.abs() Math.PI Punctuation Flow Control { if else ( ) for while, ; do 2.1 Hello Java Arrays Objects + "" a[i] class static length() compareto() new public private charat() a.length to() equals() new main() 5

2 Programming in Java Programming in Java Programming in Java. 1. Create the program by typing it into a text editor, and save it as HelloWorld.java Programming in Java. 1. Create the program by typing it into a text editor, and save it as HelloWorld.java 2. Compile it by typing at the command line: javac HelloWorld.java /******************************************* * Prints "Hello, World" * Everyone's first program. *******************************************/ public class HelloWorld { System.out.println("Hello, World"); command prompt % javac HelloWorld.java This creates a Java bytecode file named: HelloWorld.class HelloWorld.java 7 8 Programming in Java Hello, World Programming in Java. 1. Create the program by typing it into a text editor, and save it as HelloWorld.java 2. Compile it by typing at the command line: javac HelloWorld.java 3. Execute it by typing at the command line: java HelloWorld A few remarks.! Name of class must match name of file.! Comments between /* and */ are ignored by computer.! Whitespace and indentation is for human readability.! Syntax coloration auto-generated by editor. command prompt % javac HelloWorld.java % java HelloWorld Hello, World /******************************************* * Prints "Hello, World" * Everyone's first program. *******************************************/ public class HelloWorld { System.out.println("Hello, World"); HelloWorld.java 9 10

3 "Primitive" Data Types 2.2 Primitive Data Types Data type.! A set of values.! A set of operations on those values. Data Type Description Example Common Operations char character 'A' '@' compare sequence of characters "Hello, World" "Programming is fun" concatenation, compare int integer add, subtract, multiply, multiply, remainder double boolean floating point number truth value add, subtract, multiply, divide not, and, or 12 The data type.! A sequence of characters.! Each character internally stored as a sequence of 16 bits: '1' in Unicode! Not technically a primitive type, but special language support.! Ex: generate subdivisions of a ruler. % javac Ruler.java % java Ruler public class Ruler { ruler1 = "1 "; ruler2 = ruler1 + "2 " + ruler1; ruler3 = ruler2 + "3 " + ruler2; ruler4 = ruler3 + "4 " + ruler3; ruler5 = ruler4 + "5 " + ruler4; System.out.println(ruler5); string concatenation

4 Int Initializing Variables The int data type ! Represents integers between and ! Internally stored as a sequence of 32 bits: What happens if I forget to initialize the variable a or b?! Java compiler does not allow this.! Caveat: in other languages, variable initialized with "random" bits ! Useful when expressing algorithms Q. What is the default initialization value for Registrar's room assignment variables? public class IntOps { int a = 1234; int b = 99; int sum = a + b; int prod = a * b; int quot = a / b; int rem = a % b; = 12* Double Command Line Arguments The double data type.! Represents floating point numbers.! Internally stored as a sequence of 64 bits using scientific notation.! Useful in scientific applications.! Ex: solve quadratic equation x bx + c = 0.! b ± b! 4c roots = 2 Command line arguments.! Simple method for processing a small amount of user input. % java Quadratic command line arguments x 2 3x + 2 public class Quadratic { double b = Double.parseDouble(args[0]); double c = Double.parseDouble(args[1]); double discriminant = Math.sqrt(b*b - 4.0*c); double root1 = (-b + discriminant) / 2.0; double root2 = (-b - discriminant) / 2.0; System.out.println(root1); System.out.println(root2); print them out read coefficients from command line calculate roots % java Quadratic golden ratio % java Quadratic NaN not a number NaN % java Quadratic 1.0 hello java.lang.numberformatexception: hello % java Quadratic 1.0 java.lang.arrayindexoutofboundsexception x 2 x - 1 x 2 + x

5 Booleans and Comparisons Booleans and Comparisons The boolean data type.! Has two values: or.! Internally represented as one bit. 0 1! Useful to control logic and flow of a program. Logic Operators Comparison Operators a b a && b a b Logic Operators a!a op Description == equal 2 == 2 2 == 3!= not equal 2!= 3 2!= 2 < less 2 < 3 3 < 2 <= less or equal 2 <= 3 3 <= 2 > greater 3 > 2 2 > 3 >= greater or equal 3 >= 3 2 >= 3 Is year y a leap year?! Yes if divisible by 4. Exception: divisible by 100. Exception to exception: divisible by 400. public class LeapYear { int y = Integer.parseInt(args[0]); boolean isleapyear; // divisible by 4 but not 100 isleapyear = (y % 4 == 0) && (y % 100!= 0); // or divisible by 400 isleapyear = isleapyear (y % 400 == 0); System.out.println(isLeapYear); % java LeapYear 2004 % java LeapYear 1900 % java LeapYear Type Conversion Summary Type conversion: convert from one type of data to another.! Automatic: no loss of precision or with s.! Explicit: cast or method. Ex: generate a pseudo-random number between 0 and N-1.! Math.random outputs a double between 0.0 and 1.0. public class RandomInteger { int N = Integer.parseInt(args[0]); double r = Math.random(); to int (method) int n = (int) (r * N); A data type is a set of values and operations on those values.! : text processing.! double, int: mathematical calculator.! boolean: basis for decision making. Be aware.! Declare type of values.! Convert between types when necessary. double to int (cast) int to double (automatic) System.out.println("random integer is: " + n); int to (automatic) 22 23

6 Flow-Of-Control 2.3 Flow Control Flow-of-control.! Sequence of statements that are actually executed in a program.! Conditionals and loops: enable us to harness power of the computer. statement 1 boolean 1 statement 2 statement 1 statement 3 boolean 2 statement 2 statement 4 statement 3 straight-line flow-of-control flow-of-control with conditionals and loops 25 If-Else If-Else: Leap Year The if-else statement is a common branching structure.! Check boolean condition.! If, execute some statements.! Otherwise, execute other statements. If-else example: print informative text.! Different operation is performed depending on value of variable. if isleapyear is, then print " is a " otherwise, print " isn't a " if (boolean expression) statement1 else statement2 if-else syntax can be a block of statements statement1 boolean expression statement2 System.out.println(year); if (isleapyear) { System.out.println(" is a "); else { System.out.println(" isn't a "); System.out.println("leap year"); if-else flow chart 26 27

7 Oblivious Sorting Read in 3 integers and rearrange ascending order. public class Sort3 { int A = Integer.parseInt(args[0]); int B = Integer.parseInt(args[1]); int C = Integer.parseInt(args[2]); if (B > A) { int t = B; B = A; A = t; if (C > B) { int t = C; C = B; B = t; if (B > A) { int t = B; B = A; A = t; read in 3 integers swap A and B System.out.println(A + " " + B + " " + C); % java Sort Puzzle 1: sort 4 integers with 5 compare-exchanges. Puzzle 2: sort 6 integers with 12. % java Sort

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