excise5_8.java

一个用JAVA 写的通过点击放大的缩小字体的程序

// <applet code = "excise5_8.class"  width=600 height=180   >
// </applet>
import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class excise5_8 extends Applet implements ActionListener
{
	private static final String text = "I hava a dream that one day I have a lot of money!";
	private Button inc = new Button("放大");
	private Button dec = new Button("缩小");
	static boolean chs = true;
	static int size = 12;
	final int INC = 2;
	public void init()
	{
		setLayout(new FlowLayout());
		add(inc);
		add(dec);
		inc.addActionListener(this);
		dec.addActionListener(this);
	}
    
	public void paint(Graphics g)
	{
		   g.setFont(new Font(text,Font.PLAIN,size));
		   g.drawString(text,20,80);
	}
	public void actionPerformed(ActionEvent e)
	{
		
		if(e.getSource() == inc)
		   size+=INC; 
		else if(e.getSource() == dec)
		   size-=INC; 
	   	repaint();
	}
}