Question

JDialog打开位置问题

在一个JFrame里点击一个按钮打开一个JDialog
要怎么设置JDialog打开的位置在JFrame的正中心
最好有个例子

若以下回答无法解决问题，邀请你更新回答

Answer 1

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;

public class DialogTest extends JFrame implements ActionListener{

/**
* @param args
*/
private JButton b;
private JDialog jd;

public DialogTest(){
this.setSize(300,500);
this.setLayout(new FlowLayout());
b = new JButton("测试JDialog位置问题");
b.addActionListener(this);
this.add(b);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
}

public static void main(String[] args) {
new DialogTest();
}

@Override
public void actionPerformed(ActionEvent e) {
jd = new JDialog(this);
jd.setSize(100,200);
jd.setLocation(this.getWidth()/2 - jd.getWidth()/2, this.getHeight()/2 - jd.getHeight()/2);
jd.setVisible(true);
}

}

追问

JFrame移动后 点击按钮 JDialog位置不对！

追答

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;

public class DialogTest extends JFrame implements ActionListener{

/**
* @param args
*/
private JButton b;
private JDialog jd;

public DialogTest(){
this.setSize(300,500);
this.setLayout(new FlowLayout());
b = new JButton("测试JDialog位置问题");
b.addActionListener(this);
this.add(b);
this.setLocation(100, 100);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
}

public static void main(String[] args) {
new DialogTest();
}

@Override
public void actionPerformed(ActionEvent e) {
jd = new JDialog(this);
jd.setSize(100,200);
jd.setLocation(this.getX() + this.getWidth()/2 - jd.getWidth()/2, this.getY() +this.getHeight()/2 - jd.getHeight()/2);
jd.setVisible(true);
}

}