The Java Boutique: Java Tutorial: Java by Example: Operators and Methods

Tutorials : Java by Example : Section 2 :

Section Two Contents

Operators and Methods

Methods With and Without a Return Value - Con't

The following applet demonstrates the subject, see the sourcecode to see what's going on:

//Sourcecode

import java.awt.*; import java.applet.*; public class Project5F extends Applet { Integer c; int addNumbers(int x, int y) { return x+y; } boolean compareNumbers(int x, int y) { if(x<y) return true; else return false; } String testNumber(int x) { if(x<100) return "The number is less than 100"; //here we omit the word "else", it is not neccessary return "The number is greater or equal 100"; } //passing an argument by reference void incrementNumber(Integer x) { int y=x.intValue(); y++; c=new Integer(y); } public void paint(Graphics g) { c=new Integer(3); boolean x=false; int a=4; int b=5; g.setFont(new Font("Helvetica",Font.PLAIN,16)); g.drawString("a="+a+", b="+b,100,30); int k=addNumbers(a, b); g.drawString("a+b="+k,110,50); x=compareNumbers(a,b); g.drawString(""+x,120,70); g.drawString(testNumber(a),50,90); a+=100; g.drawString(testNumber(a),20,110); g.drawString("c="+c,120,130); incrementNumber(c); g.drawString("now c="+c,100,150); } }

Applet Index
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The Java Source
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How to Add Java Applets to Your Site

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