怎样用java关机_java简单实现关机

package test;

import java.awt.*;import java.awt.event.*;import java.io.*;import javax.swing.*;public class Close implements ItemListener{         JFrame f=null;         JRadioButton r1=null;         JRadioButton r2=null;         JRadioButton r3=null;         JButton bt1=null;         public Close()         {        f = new JFrame("关机小程序：Black-love");             Container contentPane = f.getContentPane();             contentPane.setLayout(new GridLayout(2,1));             JPanel p1 = new JPanel();             JPanel p2=new JPanel();             p1.setLayout(new GridLayout(1,3));             p2.setLayout(new FlowLayout() );             p1.setBorder(BorderFactory.createTitledBorder("请选择"));               r1 = new JRadioButton("关机");              r2 = new JRadioButton("重启");              r3 = new JRadioButton("注销");              r1.addItemListener(this);              r2.addItemListener(this);              r3.addItemListener(this);             p1.add(r1);             p1.add(r2);             p1.add(r3);             bt1=new JButton("确定");             p2.add(bt1);             contentPane.add(p1);             contentPane.add(p2);             f.setSize(200,150);             f.show();            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         }

public void itemStateChanged(ItemEvent e) {   // TODO Auto-generated method stub   if(e.getSource() == r1)//关闭   {    bt1.addActionListener(new ActionListener()//监听事件     {       public void actionPerformed(ActionEvent event)       {         try {            Runtime.getRuntime().exec("shutdown -s");           } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();           }      }     }     );       }   else if(e.getSource()==r2)//重启   {    bt1.addActionListener(new ActionListener()//监听事件     {       public void actionPerformed(ActionEvent event)       {          try {             Runtime.getRuntime().exec("shutdown -r");            } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();            }      }     }     );   }   else if(e.getSource()==r3)//注销   {    bt1.addActionListener(new ActionListener()//监听事件     {       public void actionPerformed(ActionEvent event)       {        try {           Runtime.getRuntime().exec("shutdown -l");          } catch (IOException e) {           // TODO Auto-generated catch block           e.printStackTrace();          }      }     }     );   }}   public static void main(String[] args) {        new Close();                                                                   }

}

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