例7-19.java

医院无线局域网设计方案 医院无线局域网设计方案

//example 7-19
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class tt extends Applet implements ActionListener
{
   TextField text1,text2,text3;
   Label label1,label2,label3;
   String s;  int i;  float f;
   public void init()
   {
   	  label1=new Label("Enter A String:");add(label1);
   	  text1=new TextField("",20);text1.addActionListener(this);add(text1);
   	  label2=new Label("Enter a Integer:");add(label2);
   	  text2=new TextField("0",20);text2.addActionListener(this);add(text2);
   	  label3=new Label("Enter a Float:");add(label3);
   	  text3=new TextField("0.0",20);text3.addActionListener(this);add(text3);
   }
   public void paint(Graphics g)
   {
     g.drawString("string="+s,10,120);
     g.drawString("int  ="+i,10,140);
     g.drawString("float="+f,10,160);
   }
   public void actionPerformed(ActionEvent e)
   {
   	 s=text1.getText();i=Integer.parseInt(text2.getText());
   	 f=(Float.valueOf(text3.getText())).floatValue();
   	 repaint();
   }
}