当我在JButton和JLabel中使用setBounds方法时，什么也没有

Question

when i use setBounds(); on JLabel or JButton nothing happen ?

public Window() {

    this.setExtendedState(Window.MAXIMIZED_BOTH);
    this.setDefaultCloseOperation(Window.EXIT_ON_CLOSE);

    setUndecorated(true);          
    hideMoue();

    JLabel back=new JLabel(new ImageIcon("D:\\Java\\stone\\background.png"));
    add(back);
    back.setLayout(new FlowLayout());

    l1=new JLabel("Label");
    b1=new JButton("Button");
    l1.setBounds(483, 513, 400, 60);
    l1.setBounds(483, 443, 400, 60);
    back.add(l1);
    back.add(b1);

    setSize(1366,768);  

    setVisible(true);

}

i think the problem in the layout manager but i can not find the solution !!

Answer 1

That is the expected function for the Layout that you are using ie FlowLayout . If you want setBounds() to take effect than setLayout(null); Having said this it is highly recommended not to use null layout. How the components are placed and arranged should be left with Layout Manager

Answer 2

Change your back JLabel to null layout.

...
JLabel back=new JLabel(new ImageIcon("D:\\Java\\stone\\background.png"));
add(back);
back.setLayout(null);    
...

Keep an eye on your second setBounds() command. You set both commands on l1 .