您可以使用
GridBagLayout和适当的权重来获得所需的结果：
public class Snippet { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { Jframe f = new Jframe(); f.setDefaultCloseOperation(Jframe.DISPOSE_ON_CLOSE); JPanel leftBorder = new JPanel(); JPanel rightBorder = new JPanel(); leftBorder.setBackground(Color.black); rightBorder.setBackground(Color.black); JPanel center = new JPanel(); center.setBackground(Color.red); f.setLayout(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); gbc.fill = GridBagConstraints.BOTH; gbc.weighty = 1.0; gbc.gridy = 0; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.gridx = 0; gbc.weightx = 0.1; f.add(leftBorder, gbc); gbc.gridx = 1; gbc.weightx = 0.8; f.add(center, gbc); gbc.gridx = 2; gbc.weightx = 0.1; f.add(rightBorder, gbc); f.pack(); f.setVisible(true); } }); }}
