如何刷新JFrame？

Question

So in my program I set in the beginning a JLabel to it so now an image is on it. Now I need to remove that JLabel and put a new one instead of it. So I did:

frame.remove(test_loadingJL);
frame.add(test_lockScreenJL);

But when I look, it is still the first image and it doesn't update until I resize the actual window manually. Is there a way to update the frame so I don't have to do that?

Answer 1

这应该可以工作frame.revalidate()

Answer 2

Your Choices:

 1.SwingUtilities.updateComponentTreeUI(name of Component(in your example is frame)

SwingUtilities.updateComponentTreeUI(frame);

2.frame.dispose();

frame.setVisible(true);

3.revalidate();

  revalidate();//<------------needed when add/remove components
  repaint();//sometimes needed also, sometimes not

Also check this link possible dublicate question same question here

These should work

Answer 3

在添加组件之前，请尝试调用frame.setVisible（true）。