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Question

public class X extends Frame {
    public X() {
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                X.this.dispose();
            }
        });
    }
}public class X extends JFrame {
    public X() {
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    }
}

Answer 1

Button b=new Button("EXIT");
b.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
   System.exit(0); 
}
});

Answer 2

我要不是退出程序
只要把窗口关闭
不用setvesible