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Java Swing - 如何调整JDialog框的大小

jdialog 【jdialog】
我们想知道如何调整JDialog框的大小。
代码展示 运行结果 
import java.awt.BorderLayout;
import java.awt.GridLayout;

import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.TitledBorder;

public class Main {

  public static void main(String[] args) {
    JTextField account = new JTextField(10);
    JPanel accountPanel = new JPanel(new GridLayout());
    accountPanel.add(account);
    accountPanel.setBorder(new TitledBorder("Account"));

    String[] firstDigitList = { "0", "1", "2", "3", "4", "5", "6", "7", "8",
        "9" };

    JLabel firstDigitListLabel = new JLabel("Leading Digit Change");
    JPanel firstDigitListPanel = new JPanel(new BorderLayout(4, 2));
    firstDigitListPanel.add(firstDigitListLabel, BorderLayout.WEST);
    JComboBox firstDigitCombo = new JComboBox(firstDigitList);
    firstDigitListPanel.add(firstDigitCombo);
    firstDigitCombo.setSelectedIndex(0);
    firstDigitListPanel.setBorder(new TitledBorder("LDC"));

    JPanel panel = new JPanel();
    panel.add(accountPanel);
    panel.add(firstDigitListPanel);

    int result = JOptionPane.showConfirmDialog(null, panel,
        "Please Enter Values", JOptionPane.OK_CANCEL_OPTION);
  }
}