通过实例可以更好的了解java

10-例子1 
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Example10_1 extends Applet implements ActionListener
{  Label label1,label2; TextField text1,text2;Button button;
  public void init()
  { label1=new Label("我是第一个标签",Label.CENTER);
    label2=new Label("我是第二个标签",Label.LEFT);
    text1=new TextField(10);    　　text2=new TextField(10);
    button=new Button("确定");    add(label1);add(label2);
    add(text1);add(text2); add(button);
    button.addActionListener(this); 
  }   
  public void actionPerformed(ActionEvent e)
  { if(e.getSource()==button)
    { text1.setText(label1.getText());  text2.setText(label2.getText());
    }
   else
    {}
  }
}




10-例子2
import java.applet.*;
import java.awt.*;
public class Example10_2 extends Applet 
{ Label label1,label2;  TextField text1,text2;
  public void init()
  { label1=new Label("输入姓名");
　label2=new Label("输入性别");
　label1.setBackground(Color.red);label1.setForeground(Color.blue);
    text1=new TextField(10);   text2=new TextField(10);
    add(label1);  add(text1);add(label2); add(text2);
  }   
}



10-例子3

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
class MyLabel extends Label implements ActionListener
{TextField text1;TextArea text2;int k=0;
 MyLabel(String s)
 {super(s);
  text1=new TextField(10); text2=new TextArea(10,10);
  text1.addActionListener(this); //标签作为文本框的监视器。
 }
 public void actionPerformed(ActionEvent e)
 { double n=0;text2.setText(null);
   try{n=Double.valueOf(text1.getText()).doubleValue();
        for(int i=1;i<=n;i++)
           {if(n%i==0)
              text2.append("\n"+i);
           }
      }
   catch(NumberFormatException e1)
      {text1.setText("请输入数字字符");
      }
   if(n%2==0)
    {this.setBackground(Color.green);}
   else 
    {this.setBackground(Color.yellow);}
 }
}
public class Example10_3  extends Applet
{ MyLabel lab;
  public void init()
  {lab=new MyLabel("请输入一个数后按回车键");
   add(lab);add(lab.text1);add(lab.text2);
  }
}



10-例子4
import java.awt.*;import java.applet.*;
public class Example10_3 extends Applet 
{public void init()
  {MyLabel mylabel=new MyLabel();setLayout(null);
   setLocation(12,12);add(mylabel);
  }
}
class MyLabel extends Label
{ MyLabel()
  {setSize(20,160);setBackground(Color.white);
  }
  public void paint(Graphics g)
  {g.drawString("我",2,14);  //在标签上写"我"。
   g.drawString("是",2,34);
   g.drawString("一",2,54);
   g.drawString("个",2,74);
   g.drawString("竖",2,94);
   g.drawString("标",2,114);
   g.drawString("签",2,134);
   g.drawString("!",2,154);
  }
}