你可以在你的情況下使用的是

GridLayout,這里有兩個JButtons會在JFrame調整大小時自行調整大小.

import java.awt.GridLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;

public class Main extends JFrame {

public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable()

{

@Override

public void run()

{

JFrame window = new Main();

window.setVisible(true);

}

});

}

public Main() {

JButton east = new JButton("East");

JButton west = new JButton("West");

JPanel content = new JPanel();

content.setLayout(new GridLayout(1, 2));

content.add(east);

content.add(west);

setContentPane(content);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

pack();

}

}

此外,最好從EDT – Event Dispatch Thread運行與GUI相關的代碼,而不是從主線程運行.有關該主題的更多信息,請閱讀Concurrency in Swing.

最新編輯：根據要求的評論

使用GridBagLayout指定要提供的大小

import java.awt.Color;

import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;

public class Main extends JFrame {

public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable()

{

@Override

public void run()

{

JFrame window = new Main();

window.setVisible(true);

}

});

}

public Main() {

JPanel east = new JPanel();

east.setOpaque(true);

east.setBackground(Color.WHITE);

JPanel west = new JPanel();

west.setOpaque(true);

west.setBackground(Color.BLUE);

JPanel content = new JPanel();

content.setLayout(new GridBagLayout());

GridBagConstraints gbc = new GridBagConstraints();

gbc.anchor = GridBagConstraints.FIRST_LINE_START;

gbc.fill = GridBagConstraints.BOTH;

gbc.weightx = 0.3;

gbc.weighty = 1.0;

gbc.gridx = 0;

gbc.gridy = 0;

content.add(east, gbc);

gbc.weightx = 0.7;

gbc.gridx = 1;

content.add(west, gbc);

setContentPane(content);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

pack();

}

}

總結

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