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Java Swing - 如何在TRAILING FlowLayout中设置JButtons位置

layout 【layout】
我们想知道如何在TRAILING FlowLayout中设置JButtons位置。
代码展示 运行结果 
import java.awt.FlowLayout;
import java.awt.GridBagLayout;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class Main extends JPanel {
  public Main() {
    JLabel label = new JLabel("Text Field");
    JTextField textField = new JTextField(20);
    JRadioButton rb1 = new JRadioButton("Radio 1");
    JRadioButton rb2 = new JRadioButton("Radio 2");
    JButton button = new JButton("Button");

    JPanel panel1 = new JPanel();
    panel1.add(label);
    panel1.add(textField);

    JPanel panel2 = new JPanel();
    panel2.add(rb1);
    panel2.add(rb2);

    JPanel panel3 = new JPanel(new FlowLayout(FlowLayout.TRAILING));
    panel3.add(button);

    JPanel panel4 = new JPanel(new GridLayout(3, 1));
    panel4.add(panel1);
    panel4.add(panel2);
    panel4.add(panel3);

    setLayout(new GridBagLayout());
    add(panel4);
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.add(new Main());
    frame.pack();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }
}