Java

Random Creating simple games with Java Methods and Parameters

Agenda ,[object Object],[object Object]

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object]

The Structure of a Java Program ,[object Object],[object Object],[object Object],[object Object],[object Object]

A Java Program Class1 Class 2 Class N A Java Program static var instance var static var instance var static var instance var Method 1 statement1; statement2; statementN; Method N statement1; statement2; statementN; Method 1 statement1; statement2; statementN; Method N statement1; statement2; statementN; Method 1 statement1; statement2; statementN; Method N statement1; statement2; statementN;

Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A Java Program - a Set of Classes ,[object Object],[object Object],[object Object]

Syntax for a Java Class ,[object Object],[object Object],[object Object],[object Object],[object Object],class end delimiter class name class start delimiter class comment body of the class goes here start comment delimiter end comment delimiter visibility modifier class keyword

A Java Class - a Set of Methods ,[object Object],[object Object],One Java Class A Java Method A Java Method A Java Method A Java Method

Two Kinds of Java Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Syntax for a Java Method ,[object Object],[object Object],[object Object],[object Object],[object Object],method end delimiter method name method start delimiter method comment visibility modifier static keyword return type parameter list body of the method goes here

A Java Method - Statements ,[object Object],[object Object],A Java Method A Java Statement A Java Statement A Java Statement A Java Statement

Java Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Invoking an instance method ,[object Object],[object Object],[object Object],[object Object]

Example 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example 2 ,[object Object],String Class public String toUpperCase() { /* … class of receiver is String empty argument list empty parameter list “ HELLO” Note: returns a String – see method signature! message name is toUpperCase

Example 3 ,[object Object],Note: does not return anything – see method signature! PrintStream Class public void print(String aString) { /* … class of receiver is PrintStream message name is print one argument class String one parameter class String

Parameters ,[object Object],[object Object],[object Object]

Declaring Parameters ,[object Object],[object Object],[object Object],Parameter declaration

Parameters & Local Variables ,[object Object],[object Object],[object Object],[object Object],[object Object]

Initializing Parameters ,[object Object],[object Object],[object Object],[object Object],[object Object],1 index 1 number 1 number

An Example using Primitive Data Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object]

“ Real Programmers always confuse Christmas and Halloween because Oct31 == Dec25” --Andrew Rutherford

Java

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