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Java Swing - 如何使用GridBagLayout设置高度百分比

layout 【layout】
我们想知道如何使用GridBagLayout设置高度百分比。
代码展示 运行结果 
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.Border;

public class Main extends JFrame {
  public Main() {
    getContentPane().setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    JPanel panel1 = new JPanel();
    Border eBorder = BorderFactory.createEtchedBorder();
    panel1.setBorder(BorderFactory.createTitledBorder(eBorder, "70pct"));
    gbc.gridx = gbc.gridy = 0;
    gbc.gridwidth = gbc.gridheight = 1;
    gbc.fill = GridBagConstraints.BOTH;
    gbc.anchor = GridBagConstraints.NORTHWEST;
    gbc.weightx = gbc.weighty = 70;
    getContentPane().add(panel1, gbc);
    JPanel panel2 = new JPanel();
    panel2.setBorder(BorderFactory.createTitledBorder(eBorder, "30pct"));
    gbc.gridy = 1;
    gbc.weightx = 30;
    gbc.weighty = 30;
    gbc.insets = new Insets(2, 2, 2, 2);
    getContentPane().add(panel2, gbc);
    pack();
  }
  public static void main(String[] args) {
    new Main().setVisible(true);
  }
}