Simple Java Program. public class HelloWorld {
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- Jody Campbell
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2 Simple Java Program file: HelloWorld.java public class HelloWorld { } public static void main (String[] args) { //our instructions go here System.out.println("Hello, World!"); } Each word of this should make sense by the semester's end! For now it is boilerplate code just the template we'll use to write code.
3 Whitespace Whitespace means the 'blank' characters: space, tab, newline characters. White Space is (almost) irrelevant in Java. spaces used to separate idencfiers (int x vs intx) we can't span lines within Strings. (no typing <enter> between " ") Syntax is not based on indentacons but indentacon is highly recommended! (required for class)
4 Bad Whitespace Example #1 public Spacey { public stacc Valid, but horribly wriven, code. (excessive, meaningless spacing) class void main(string[ ] args ){ System. out.println("weirdly-spaced code scll runs!" );}}
5 Bad Whitespace Example #2 Valid, but horribly wriven, code. (one-liners aren't always best!) public class Spacey2{public static void main(string[]args){system.out. println("space-devoid code also runs...");}} (the above is all on one line of text in Spacey2.java) Code like this might not receive any credit! Seriously, don't do this in anything you ever turn in. Never make the grader unhappy.
6 Good Whitespace Example public class GoodSpacing {" public static void main (String[] args) {" int x = 5;" int y = 12;" System.out.println("x+y = "+ (x+y));" }" } indentagon levels for each block: class, method definigons, control structures
7 Identifiers Identifiers are the 'names' we choose for variables, methods, classes, interfaces, etc. An identifier can be made up of letters, digits, the underscore character ( _ ), and the dollar sign ($) Identifiers cannot begin with a digit Java is case sensitive - Total, total, and TOTAL are different identifiers 1-7
8 Identifiers Identifiers cannot be keywords By convention, programmers use different case styles for different types of identifiers, such as lower case for variables response, previousindex title case for class names Person, MasonStudent upper case for constants MASON, MAX_INT
9 IdenCfier Examples Legal IdenCfier Examples: Illegal IdenCfier Examples: hello camelcasename $_09abizzare user_input18 anyarbitrarilylongname two words Extra-Characters! 1st_char_a_number transient (it's a keyword) Dots.And.Hooks?
10 Java Keywords Keywords are idencfiers that have meanings in the language definicon. They cannot be used by programmers as new idencfiers.
11 Types! Java is strongly typed: every expression has a specific type that is known at compile Cme, and never changes. (whether it's a variable, literal value, method call, or any other expression) Java has two kinds of types: primi3ve types (containing literal values) reference types (containing objects of some class).
12 PrimiCve Types PrimiCve Types contain the basic values of the language, such as numbers, characters, and booleans. boolean: truth values. Only possible values: true, false. char: one character in single-quotes: 'a' 'H' '\n' '5' numbers: there are many versions of integers (all with limited ranges), and two versions of real numbers (different precision/ranges).
13 Specific Integer Types Java provides integral numbers of different 'widths' (different numbers of bits), and different ranges of values: byte (8 bits) -128 to 127 short (16 bits) to int (32 bits) to long (64 bits) (-2 63 ) to (2 63-1) char (16 bits) 0 to (all posicve) (can edit char as its Unicode #, but it sgll is printed as its current character, not the code number) The compiler doesn't allow too-big numbers in each type. To specify long values, add an 'L' to the end: (or 'l', which looks like a 1) L 037L 0x345L L
14 Literal Integer RepresentaCon Integers can be represented in decimal, hexadecimal, or octal. (different representagons of the same values!) decimal: start with 1-9, followed by 0-9. (or just the 0 value.) hexadecimal (base 16): prefix 0x, followed by one or more of ABCDEF. (also, a-f are equivalent to A-F).
15 Note on Different RepresentaCons All three inputs are alternacves you can use to describe the same values. You also know: Roman Numerals tally-marks (e.g., XLVI) (base 1 councng) à All of these represent integers! Don't confuse representacon with meaning.
16 FloaCng Point Numbers Approxima3ng the real #s: called floacng point numbers. We just write things in normal base 10 as always. internal sign binary exponent representacon: fraccon like sciencfic notacon. S: sign bit. E: bias-adjusted exponent. M: adjusted fracconal value. value = (-1) S * 2 E * M Also representable: infinity (+/ ), NaN ("not a
17 RepresenCng FloaCng Point Numbers FloaCng Point numbers: - may have a decimal point followed by digits may be wriven in sciencfic notacon: 2.32e5 = 2.32x10 5 = may be very large: 2E35F 2e250-2e250 float: use f suffix (or F) to indicate float. 0f f -2E3F 59023f double: floacng point numbers are doubles by default E30
18 PracCce Problem To what types can these numbers be stored? char byte short int long float double e200 0x3F 371F float char short int long float double double double byte short int long float double double
19 CreaCng Variables Variables must be declared and ini3alized before use. Declara3on: creates the variable. It includes a type and a name. The variable can only hold values of that type. int x; char c; boolean ok; Person p; Ini3aliza3on: assign an expr. of the variable's type to it. x=7+8; c='m'; ok = true; p = new Person(); Both: we can declare and instancate all at once: int x = 5; char c = 'S'; Person p = new Person();
20 CasCng With all these numerical types, changing between them is possible, and has implicacons. a cast is a conversion from one type to another. We cast things by placing the type in parentheses in front of it: (int) 3.14f One use: forcing floacng-point division. int x=3, y=4; double z = ((double)x)/y; System.out.println(z); //prints 0.75
21 Java Comments There are two main styles of comments in Java: Single-Line: from // to the end of the line. Mul3-Line: all content between /* and */, whether it spans mulcple lines or part of one line. JavaDoc: convengon of commengng style that helps generate code documentagon/api. More on this later.
22 Expressions, Statements Expression: a representacon of a calculacon that can be evaluated to result in a single value. There is no indicacon what to do with the value. Statement: a command, or instruccon, for the computer to perform some accon. Statements oen contain expressions.
23 Basic Expressions literals (all our numbers, booleans, characters) operacon exprs: < <= > >= ==!= (relaconal ops) + - * / % (math ops) &&! (boolean ops) e? e : e (ternary condiconal expr) variables parenthesized expressions ( expr )
24 CondiConal Expression The?: ternary operator is a condiconal expression: it evaluates the boolean expression, and then results in the middle expression when true, and the last expression when false. boolexpr? expr : expr We must have all three parts, and the 2 nd and 3 rd expressions' types must agree with (fit in) the resulcng type of the encre expression.
25 Expression Examples Legal: 4+5 (3>x) && (! true) x%2==1 (x<y)&&(y<z) numpeople drawcard() (2+3)*4 y!=z Illegal (these aren't expressions): x>y>z 4 && false x=3 7(x+y)
26 Basic Statements DeclaraCon: announce that a variable exists. Assignment: store an expression's result into a variable. method invocacons (may be stand-alone) blocks: mulcple statements in { }'s control-flow: if-else, for, while, (next lecture)
27 Statement Examples int x; // declare x x = 15; // assignment to x int y = 7; // decl./assign. of y x = y+((3*x) 5); // assign. with operators x++; // increment stmt (x = x+1) System.out.println(x); // method invocacon if (x>50) { x = x 50; } else { y = y+1; } //if-else statement
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