JAVA学习

				import java.applet.*;
				import java.awt.*;
				import java.awt.event.*;
				
				public class FontDemo extends Applet
				             implements ActionListener
				{
				   Font f,fo;
				   String msg="";
				   int i;
				   Button b1,b2,b3,b4;
				   
				   public void init()
					{
					    b1=new Button("Dialog");
					    b2=new Button("Times New Roman");
					    b3=new Button("Sans Serif");
					    b4=new Button("Serif");
				
				            add(b1);
					    add(b2);
					    add(b3);
					    add(b4);
				
					    b1.addActionListener(this);
					    b2.addActionListener(this);
					    b3.addActionListener(this);
					    b4.addActionListener(this);
				            
					    fo=new Font("Dialog", Font.PLAIN,12);
				        }
				   
				   public void actionPerformed (ActionEvent ae)
					{
					   if(ae.getSource()==b1)
						{
						  f=new Font("Dialog", Font.PLAIN,26);
						  setFont(f);
						  b1.setFont(fo);
						  msg="This is the Font Dialog";
						}
					   else if(ae.getSource()==b2)
						{
						  f=new Font("Times New Roman", Font.BOLD,26);
						  setFont(f);
						  b2.setFont(fo);
						  msg="This is the Font Times New Roman";
						}
					   else if(ae.getSource()==b3)
						{
						  f=new Font("Sans Serif", Font.ITALIC,26);
						  setFont(f);
						  b3.setFont(fo);
						  msg="This is the Font Sans Serif";
						}
					   else
					        {
						  f=new Font("Serif", Font.ITALIC|Font.BOLD,26);
						  setFont(f);
						  b4.setFont(fo);
						  msg="This is the Font Sans Serif";
						}
					  
					
					}
				   public void paint(Graphics g)
					{
					    g.drawString(msg,10,100);
					}
				   
				}