Java 在 JLabel 上添加和删除图标

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时间:2020-08-13 05:04:44  来源:igfitidea点击:

Add and remove an icon on a JLabel

javauser-interface

提问by samuel

hi i have a label that i have set a icon for it, i want to remove this icon after clicking on a button, what is the method for it?

嗨,我有一个标签,我为它设置了一个图标,我想在点击一个按钮后删除这个图标,它的方法是什么?

回答by ndeuma

label.setIcon(null) 

in the event handler that handles the button click, if you're using Swing.

如果您使用的是 Swing,则在处理按钮单击的事件处理程序中。

回答by Adamski

// Create icon
Icon icon = new ImageIcon(getClass().getResource("/foo/bar/baz.png"));

// Create label
final JLabel lbl = new JLabel("Hello, World", icon, JLabel.LEFT_ALIGNMENT);

// Create button
JButton btn = new JButton("Click Me");
btn.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent evt) {
    // Remove icon when button is clicked.
    lbl.setIcon(null);

    // **IMPORTANT** to call revalidate() to cause JLabel to resize and be repainted.
    lbl.revalidate();
  }
});