Question

Java 关于getText()取不到值的问题

以下是代码，主要问题是当点击“新建”弹出dialog后，在NameFrame里输了string，可是为什么getText()取不到呢，internalframe的名称总是空的，是不是顺序错了还是少什么？应该怎么改，各位大神帮帮忙啊~~

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Test extends JFrame {

JDesktopPane desktoppane = new JDesktopPane();
String Name;

public Test(){

Container contentPane = this.getContentPane();
contentPane.add(desktoppane);
creatMenu();
setTitle("Test");
setSize(500, 600);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}

//创建菜单栏
public void creatMenu(){

JMenuBar MyJMenuBar = new JMenuBar();
JMenu file = new JMenu("文件");
MyJMenuBar.add(file);
JMenuItem build = new JMenuItem("新建");
file.add(build);

this.setJMenuBar(MyJMenuBar);

build.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){
creatDialog();
}
});
}

//创建对话框
public void creatDialog(){

final JDialog dialog = new JDialog(this,"对话框");
dialog.setLayout(new GridBagLayout());
JLabel blank1 = new JLabel(" ");
JLabel name = new JLabel("名称：");
JTextField NameFrame = new JTextField(10);
JButton button1 = new JButton("提交");

GridBagConstraints c = new GridBagConstraints();

dialog.getContentPane().add(name,c);
dialog.getContentPane().add(NameFrame,c);
c.gridy=1;
dialog.getContentPane().add(button1,c);

Name = NameFrame.getText().trim();
// System.out.println(Name);
NameFrame.setText("");

dialog.setSize(300,350);
dialog.setLocation(550,150);
dialog.setVisible(true);

button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
creatInternalframe();
dialog.dispose();
}
});
}

//创建内部窗口
public void creatInternalframe(){

JInternalFrame internalframe = new JInternalFrame(Name,true,true,true,true);
// internalframe.setTitle(Name);
internalframe.setSize(400,400);
internalframe.setVisible(true);
Container icontentPane = internalframe.getContentPane();
icontentPane.add(new JEditorPane());
desktoppane.add(internalframe);
}

public static void main(String[] args) {

Test designer = new Test();
}
}

Answer 1

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Test extends JFrame {

JDesktopPane desktoppane = new JDesktopPane();
String Name;

public Test(){

Container contentPane = this.getContentPane();
contentPane.add(desktoppane);
creatMenu();
setTitle("Test");
setSize(500, 600);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}

//创建菜单栏
public void creatMenu(){

JMenuBar MyJMenuBar = new JMenuBar();
JMenu file = new JMenu("文件");
MyJMenuBar.add(file);
JMenuItem build = new JMenuItem("新建");
file.add(build);

this.setJMenuBar(MyJMenuBar);

build.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){
creatDialog();
}
});
}

//创建对话框
public void creatDialog(){

final JDialog dialog = new JDialog(this,"对话框");
dialog.setLayout(new GridBagLayout());
JLabel blank1 = new JLabel(" ");
JLabel name = new JLabel("名称：");
final JTextField NameFrame = new JTextField(10);
JButton button1 = new JButton("提交");

GridBagConstraints c = new GridBagConstraints();

dialog.getContentPane().add(name,c);
dialog.getContentPane().add(NameFrame,c);
c.gridy=1;
dialog.getContentPane().add(button1,c);

NameFrame.setText("");

dialog.setSize(300,350);
dialog.setLocation(550,150);
dialog.setVisible(true);

button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
Name = NameFrame.getText().trim();
System.out.println(Name);
creatInternalframe();
dialog.dispose();
}
});
}

//创建内部窗口
public void creatInternalframe(){

JInternalFrame internalframe = new JInternalFrame(Name,true,true,true,true);
// internalframe.setTitle(Name);
internalframe.setSize(400,400);
internalframe.setVisible(true);
Container icontentPane = internalframe.getContentPane();
icontentPane.add(new JEditorPane());
desktoppane.add(internalframe);
}

public static void main(String[] args) {

Test designer = new Test();
}
}
帮你调好了，你这是逻辑错误，getText()是要在Button触发监听之后执行才是有效的，希望及时采纳

追问

谢谢你~~我把你的复制过去以后NameFrame有问题，这是为什么，然后只能把NameFrame设成public，能出结果，但是显示有错误。。您好人做到底啊。。

Answer 2

你试一下：Name = dialog.NameFrame.getText().trim();
要不然就把dialog 写成内部类，把NameFrame放进去再取。