import java.awt.*;
import java.awt.event.*;
import java.util.Scanner;

public class Atest extends Frame {
Checkbox checkbox;
Checkbox checkbox2;
Panel panel ;
TextField textfield;

  public Atest(){
   checkbox=new Checkbox("boy"); 
   checkbox2=new Checkbox("girl");
   panel=new Panel();
   panel.add(checkbox);
   panel.add(checkbox2);
   panel.setLayout(new GridLayout(2,1));
    textfield=new TextField("请输入您的用户名",2);
    textfield.addActionListener(new ActionListener(){
     public void actionPerformed(ActionEvent aevt){
        Scanner reader=new Scanner(System.in);
        String input=reader.next();
        
        System.out.println("input"+input);
       reader.close();
      }
    });
    checkbox.addItemListener(itemlist);
    checkbox2.addItemListener(itemlist);
   add(panel,BorderLayout.WEST);
   add(textfield,BorderLayout.SOUTH);
   pack();
   
   setVisible(true);
  addWindowListener(new WindowAdapter(){
    public void windowClosing(WindowEvent evt){System.exit(0);}}); 
  }
  itemlistener itemlist=new itemlistener();
  class itemlistener implements ItemListener{
    public void itemStateChanged(ItemEvent evt){
      if(checkbox.getState()){checkbox2.setState(false);}
      if(checkbox2.getState())checkbox.setState(false);
      
      
      
    
    }
  }