弹窗

弹窗

//主窗口
public class DialogDemo extends JFrame {
    public DialogDemo() throws HeadlessException {
        this.setVisible(true);
        this.setSize(500,500);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //JFrame 放容器
        Container container = this.getContentPane();
        //绝对布局
        container.setLayout(null);
        //按钮
        JButton button = new JButton("弹出对话框！");
        button.setBounds(30,30,200,100);
        //点击按钮时，弹出一个弹窗
        button.addActionListener(new ActionListener() { //监听器
            @Override
            public void actionPerformed(ActionEvent e) {
                //弹窗
                new MyDialogDemo();
            }
        });
        container.add(button);
    }

    public static void main(String[] args) {
        new DialogDemo();
    }
}

//弹窗
class MyDialogDemo extends JDialog{
        public MyDialogDemo(){
            this.setVisible(true);
            this.setBounds(100,100,500,500);
 			// this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);   
            this.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
            //JDialog退出只能是D0_ONTHING,HIDE,DISPOSE这三个中的一种
            //应该是默认就有关闭事件
            Container contentPane = this.getContentPane();
            contentPane.setLayout(null);
            Label label = new Label("test!");
            label.setBackground(Color.CYAN);
            label.setBounds(50,50,200,200);  //标签设置大小才能显示
            contentPane.add(label);
        }
}