GUI(二)

来源：互联网发布：网络安装系统编辑：程序博客网时间：2024/04/30 11:33

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Gui{
JCheckBox right1=new JCheckBox("1");
JCheckBox right2=new JCheckBox("2");
JCheckBox right4=new JCheckBox("4");
JCheckBox right8=new JCheckBox("8");
    StringBuffer choices;
    JFrame frame=new JFrame("CheckBoxDemo");
    JLabel displayLabel;
    Gui()
   {

      right1.setMnemonic(KeyEvent.VK_4);
      right1.setSelected(true);

      right2.setMnemonic(KeyEvent.VK_3);
      right2.setSelected(true);

      right4.setMnemonic(KeyEvent.VK_2);
      right4.setSelected(true);

      right8.setMnemonic(KeyEvent.VK_1);
      right8.setSelected(true);





      CheckBoxListener myListener=new CheckBoxListener();

      right1.addItemListener(myListener);
      right2.addItemListener(myListener);
      right4.addItemListener(myListener);
      right8.addItemListener(myListener);
      choices=new StringBuffer("0000");
      displayLabel=new JLabel(choices.toString());

      JPanel checkPanel=new JPanel();
      checkPanel.setLayout(new GridLayout(0,1));
      checkPanel.add(right1);
      checkPanel.add(right2);
      checkPanel.add(right4);
      checkPanel.add(right8);

      frame.getContentPane().setLayout(new BorderLayout());
      frame.getContentPane().add(checkPanel,BorderLayout.WEST);
      frame.getContentPane().add(displayLabel,BorderLayout.CENTER);
      frame.setSize(500,500);

      frame.addWindowListener(new WindowAdapter(){
      public void windowClosing(WindowEvent e)
      { System.exit(0);
      }
      });
    // frame.pack(); 此处不用使用这个方法
     frame.setVisible(true);

}

     class CheckBoxListener implements ItemListener
      { public void itemStateChanged(ItemEvent e)
        { int index=0;
          char c='-';
          Object source =e.getItemSelectable();
          if(source==right8)
          { index=0;
            c='8';
          }else if (source==right4)
          { index=1;
            c='4';
          }
          else if (source==right2)
          { index=2;
            c='2';
          }
          else if (source==right1)
          { index=3;
            c='1';
          }
          if(e.getStateChange()==ItemEvent.DESELECTED)
            c='-';
          choices.setCharAt(index,c);
          displayLabel.setText(choices.toString());
        }
      }


    public static void main(String s[])
      { new Gui();
      }

}