如何在单击exit菜单项时关闭程序

Question

我正在学习如何使用GUI管理器在Java中创建GUI。我试图有它的地方，如果菜单项exit被点击程序将关闭。老实说，我一点也不知道该怎么做。这是我到目前为止写的

package week3lab;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class posGUI extends javax.swing.JFrame {
    /**
     * Creates new form posGUI
     */
    public posGUI() {
        initComponents();
    }
    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
        jPanel1 = new javax.swing.JPanel();
        jMenuBar1 = new javax.swing.JMenuBar();
        jMenu1 = new javax.swing.JMenu();
        exitbtn = new javax.swing.JMenuItem();
        jMenu2 = new javax.swing.JMenu();
        addbtn = new javax.swing.JMenuItem();
        nextbtn = new javax.swing.JMenuItem();
        newbtn = new javax.swing.JMenuItem();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 277, Short.MAX_VALUE)
        );
        jMenu1.setText("File");
        exitbtn.setText("Exit");
        jMenu1.add(exitbtn);
        jMenuBar1.add(jMenu1);
        jMenu2.setText("Order");
        addbtn.setText("Add to Order");
        jMenu2.add(addbtn);
        nextbtn.setText("Clear for Next Item");
        jMenu2.add(nextbtn);
        newbtn.setText("New Order");
        jMenu2.add(newbtn);
        jMenuBar1.add(jMenu2);
        setJMenuBar(jMenuBar1);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        pack();
    }// </editor-fold>                        
    /**
     * @param args the command line arguments
     */

    @Override
    public void getInput (ActionEvent e)
    {
    }
    // Variables declaration - do not modify                     
    private javax.swing.JMenuItem addbtn;
    private javax.swing.JMenuItem exitbtn;
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenu jMenu2;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JMenuItem newbtn;
    private javax.swing.JMenuItem nextbtn;
    // End of variables declaration                   
}

Answer 1

创建onClickListener并使用活动的方法this.finishAffinity();