Tutorials : Java by Example : Section 2 :

Operators and Methods

Using Methods and Basic Mouse Funtions - Con't

The expression "clicks=clicks+1;", which increments the variable "clicks", is usually written in short form: "clicks++", which we will also do from now on. The expression "clicks+=2" would increment it with 2 instead of 1.

//Sourcecode import java.awt.*; import java.applet.*; public class Project5 extends Applet { int mouseX, mouseY, clicks; boolean mouseIn; public boolean mouseDown(Event evt,int x,int y) { clicks=clicks+1; mouseX=x; mouseY=y; repaint(); return true; } public boolean mouseEnter(Event evt,int x,int y) { mouseIn=true; repaint(); return true; } public boolean mouseExit(Event evt,int x,int y) { mouseIn=false; repaint(); return true; } public void paint(Graphics g) { g.setFont(new Font("Helvetica",Font.PLAIN,13)); g.setColor(Color.black); g.drawString("Mouse clicks: "+clicks, 100,80); g.drawString("Mouseclick coordinates: x="+mouseX+", y="+mouseY, 40,110); if(mouseIn==true) { g.setColor(Color.red); g.drawString("Mouse is inside the applet",70,180); } else { g.setColor(Color.blue); g.drawString("Mouse is outside the applet",70,180); } } }

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