c23.java

这是一些学生的JAVA课程设计

/*<applet code="c23.class" width=300 height=300>
</applet>
*/

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class c23 extends Applet
      implements ActionListener,Runnable
{
Button btn1;
Label btn;
TextField t1,t2,t3;
Thread t=null,ttext=null;
String str;
Choice c;
Image imgs[]=new Image[3];
String text=" ";
int n=0,pos=0;
int len=this.getSize().width;
public void start()
{
ttext=new Thread(this);
t=new Thread(this);
n=0;
t.start();
}
public void init()
{
setBackground(Color.blue);
t1=new TextField(6);
t2=new TextField(6);
t3 =new TextField(15);
t1.setBackground(Color.lightGray);
t2.setBackground(Color.lightGray);
t3.setBackground(Color.lightGray);
 for(int i=0;i<3;i++)
   { 

    
       imgs[i]=getImage(getCodeBase(),String.valueOf(i+1)+".gif");
      
     
    }
c=new Choice();
c.add("+");
c.add("-");
c.add("*");
c.add("/");
c.add("%");
//c.addItemListener(this);
add(t1);
add(c);
add(t2);
btn=new Label("=");
add(btn);

add(t3);

btn1=new Button("查看结果");
add(btn1);
btn1.addActionListener(this);
	
}

/*public void itemStateChanged(ItemEvent e)
{
  str=(String)e.getItem();
} */
public String getResult()
{
 if(c.getSelectedItem()=="+")
    return String.valueOf(Integer.parseInt(t1.getText())+Integer.parseInt(t2.getText()));  
 if(c.getSelectedItem()=="-")
    return String.valueOf(Integer.parseInt(t1.getText())-Integer.parseInt(t2.getText()));  
 if(c.getSelectedItem()=="*")
    return String.valueOf(Integer.parseInt(t1.getText())*Integer.parseInt(t2.getText()));  
 if(c.getSelectedItem()=="/")
    return String.valueOf(Integer.parseInt(t1.getText())/Integer.parseInt(t2.getText())); 
 else
    return String.valueOf(Integer.parseInt(t1.getText())%Integer.parseInt(t2.getText()));  
}
public void run()
{
while(t==Thread.currentThread())
{
  try
    { 
      t.sleep(300);
      repaint();
      n++;     
 }catch(Exception e){}
 if(n>2) n=0;
 
}
while(ttext==Thread.currentThread())
{
 try
   { 
       ttext.sleep(300);
       repaint();
       pos+=5;
   }catch(Exception e){}
  if(pos>550)
   ttext=null;
}
}
 
public void paint(Graphics g)
{
float rr=(float)Math.random();
float gg=(float)Math.random();
float bb=(float)Math.random();
g.setColor(new Color(rr,gg,bb));
g.setFont(new Font("宋体",Font.BOLD+Font.ITALIC,36));
g.drawString(text,this.getSize().width-2*pos,this.getSize().height/2-30);
g.drawImage(imgs[n],this.getSize().width/2-100,this.getSize().height/2,230,200,this);
g.fillOval(100,150,80,80);}
public void actionPerformed(ActionEvent e)
{
   
 String s=t3.getText();
 if(e.getSource()==btn1)
   {
   if(s.equals(getResult()))
     {
      
     
      
       ttext=new Thread(this);
    ttext.start();  
      text="真聪明!!";     
}
   else
     {
     
     
        ttext=new Thread(this); 
       ttext.start(); 
   
      text="你好笨!!^_^糗大了!!哈哈!!";
     }
  }
}

}