checkbox1.java

学习java语言

import java.awt.*;
import java.awt.event.*;
class Mypanel1 extends Panel implements ItemListener {
    Checkbox box1, box2, box3;
    CheckboxGroup sex;
    TextArea text;
    Mypanel1(TextArea text) {
      this .text = text;
      sex =new CheckboxGroup();
      box1 = new Checkbox("boy",true,sex);
      box2 = new Checkbox("girl",false,sex);
      box1.addItemListener(this);
      box2.addItemListener(this);
      add(box1);
      add(box2);
    }
    public void itemStateChanged(ItemEvent e) {
      Checkbox box = (Checkbox)e.getSource();
      if(box.getState()){
        int n = text.getCaretPosition();
        text.insert(box.getLabel() + "\n",n);
      }
    }
}

class Mypanel2 extends Panel implements ItemListener {
    Checkbox box1, box2, box3;
    TextArea text;
    Mypanel2(TextArea text) {
      this .text = text;
      
      box1 = new Checkbox("zhansan");
      box2 = new Checkbox("li shi");
      box1.addItemListener(this);
      box2.addItemListener(this);
      add(box1);
      add(box2);
    }
    public void itemStateChanged(ItemEvent e) {
      Checkbox box = (Checkbox)e.getItemSelectable();
      if(box.getState()){
        int n = text.getCaretPosition();
        text.insert(box.getLabel() + "\n",n);
      }
    }
}

class WindowBox extends Frame{
   Mypanel1 panel1;
   Mypanel2 panel2;
   TextArea text;
   WindowBox() {
     text = new TextArea();
     panel1 = new Mypanel1(text);
     panel2 = new Mypanel2(text);
     add(panel1,BorderLayout.SOUTH);
     add(panel2,BorderLayout.NORTH);
     add(text,BorderLayout.CENTER);
     setSize(200,200);
     setVisible(true);
     validate();
   }
}
public class CheckBox1 {
  public static void main(String arg[]) {
    new WindowBox();
  }
}