作为参考，以下是显示基本方法的脚本validate()。这个更精致的示例显示了两个要求：它更改布局并动态添加组件。
import java.awt.*;import java.awt.event.ActionEvent;import javax.swing.*;public class DynamicLayout extends JPanel { private static final LayoutManager H = new GridLayout(1, 0); private static final LayoutManager V = new GridLayout(0, 1); public DynamicLayout() { this.setLayout(H); this.setPreferredSize(new Dimension(320, 240)); for (int i = 0; i < 3; i++) { this.add(new JLabel("Label " + String.valueOf(i), JLabel.CENTER)); } } private void display() { Jframe f = new Jframe("DynamicLayout"); f.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); f.add(this); JPanel p = new JPanel(); p.add(new JButton(new AbstractAction("Horizontal") { @Override public void actionPerformed(ActionEvent e) { DynamicLayout.this.setLayout(H); DynamicLayout.this.validate(); } })); p.add(new JButton(new AbstractAction("Vertical") { @Override public void actionPerformed(ActionEvent e) { DynamicLayout.this.setLayout(V); DynamicLayout.this.validate(); } })); f.add(p, BorderLayout.SOUTH); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { new DynamicLayout().display(); } }); }}
