Swing窗体放大后标签怎么保持居中

Question

Swing窗体放大后标签怎么保持居中

Answer 1

private JPanel contentPane;
private JLabel jl;

//增加一个面板监听事件，监听面板改变大小。
contentPane.addComponentListener(new ComponentListener() {
            
            @Override
            public void componentShown(ComponentEvent e) {
                // TODO Auto-generated method stub
                
            }
            
            @Override
            public void componentResized(ComponentEvent e) {    //如果面板大小发生变化，做如下事情。
                // TODO Auto-generated method stub
                //从新设置lable的位置，x轴为窗体宽减lable宽除以2，y轴为窗体高减lable高除以2，宽、高位原lable宽高。
                jl.setBounds((contentPane.getWidth()-jl.getWidth())/2, (contentPane.getHeight()-jl.getHeight())/2, jl.getWidth(),jl.getHeight());
                //更新视图
                contentPane.updateUI();
            }
            
            @Override
            public void componentMoved(ComponentEvent e) {
                // TODO Auto-generated method stub
                
            }
            
            @Override
            public void componentHidden(ComponentEvent e) {
                // TODO Auto-generated method stub
                
            }
        });