Tutorials : Java by Example : Section 3 :

Fonts and Graphics

Fonts, Random Numbers and Timers - Con't

//Sourcecode import java.awt.*; import java.applet.*; //demonstrates the use of random numbers //this program produces a number between 1 and 6 when you click public class Project7 extends Applet { int randomNumber; public boolean mouseDown(Event evt,int x,int y) { //here it all happens.. Math.random() returns a floating point number //between 0 and 1, so you have to multiply with an integer to produce //integer random numbers and finally add 1 to exclude the 0 randomNumber=(int)(Math.random()*6)+1; repaint(); return true; } public void paint(Graphics g) { g.setColor(Color.red); g.setFont(new Font("Helvetica",Font.PLAIN,12)); g.drawString ("Click for random number between 1 and 6", 30,20); g.setColor(Color.blue); g.setFont(new Font("Helvetica",Font.BOLD,180)); //in the beginning randomNumber is 0, so we suppress it here if(randomNumber!=0) g.drawString(""+randomNumber, 100,210); } }

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