app.java

一个简单的APPLET程序。可以对字体进行放大或者缩小

import  java.applet. Applet;
import  java.awt. event.*;
import  java.awt.*;
public class App extends Applet implements ActionListener
{


int i=20;

Label l1=new Label();
Label l2=new Label();
Label l3=new Label();
Panel p;
Button b1=new Button("放大");
Button b2=new Button("缩小");
public void init ()
{


p=new Panel();
b1.addActionListener(this);
b2.addActionListener(this);
p.setLayout(new GridLayout(1,5));
this.setLayout(new BorderLayout());
p.add(l1);
p.add(b1);
p.add(l2);		
p.add(b2);
p.add(l3);
add(p,"South");
}
 public void paint(Graphics g){
Font f;

//Color c;

//c=new Color(r,m,b);
 f=new Font("TimesRoman",Font.PLAIN,3+i);
 g.setColor(Color.purple);
 g.setFont(f);
 g.drawString("老师辛苦了!",50,100);}

public void actionPerformed(ActionEvent e)
{
if(e.getActionCommand()==("放大")){
	i=i+5;
	repaint();
}
if(e.getActionCommand()==("缩小"))

i=i-5;




repaint();
}

}