我是Java的新手，我只是在寻求一些帮助。我试图创建一个程序，允许用户输入gui的名称和＆gt; ＆gt;百货商店的位置。它允许这样但是程序不等待输入＆gt;细节它只是初始化Gui类并继续使用＆gt;处理将输入Gui的细节添加到数组列表中。但尚未输入＆gt;详细信息，因此它创建了一个空值，因为它已经跳过了>提前。
那么我怎样才能让它停下来等到输入值然后再提交？
以下是代码的Gui组件：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class guiDepartment extends JFrame
{
private String depName;
private String depLocation;
private static Department newDepartment;
private JTextField departmentDetails1;
private JTextField departmentDetails2;
private JTextField departmentDetails3;
private Employee worksInInTheDepartment;
public guiDepartment()
{
System.out.println("bob the builder ");
JButton submit;
JButton b1;
JFrame frame = new JFrame();
departmentDetails1 = new JTextField(10);
departmentDetails2 = new JTextField(10);
departmentDetails3 = new JTextField(10);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(new Dimension(320, 75));
frame.setTitle("Department Details");
frame.setLayout(new FlowLayout());
frame.add(new JLabel("Please enter department Name: "));
frame.add(departmentDetails1);
ButtonListenerDepName dListener = new ButtonListenerDepName();
System.out.println(depName);
frame.add(new JLabel("Please enter department location: "));
frame.add(departmentDetails2);
ButtonListenerDepName1 dListener1 = new ButtonListenerDepName1();
b1 = new JButton ("Submit");
ButtonListener listener = new ButtonListener();
b1.addActionListener(listener);
b1.addActionListener(dListener);
b1.addActionListener(dListener1);
frame.add(b1);
frame.pack();
frame.setSize(300,300);
frame.setVisible(true);
}
public class ButtonListenerDepName implements ActionListener
{
public void actionPerformed (ActionEvent e )
{
depName = departmentDetails1.getText();
System.out.println("and This is the departments name :"+ depName);
}
}
public class ButtonListenerDepName1 implements ActionListener
{
public void actionPerformed (ActionEvent e )
{
depLocation = departmentDetails2.getText();
System.out.println("and This is the departments location :"+ depLocation);
}
}
public class ButtonListener implements ActionListener
{
public void actionPerformed (ActionEvent e )
{
//create a new department and then adds it to thee system
newDepartment = new Department(depName, depLocation);
}
}
public static Department getDepartment()
{
return newDepartment;
}
}
>>and this is the Main class
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class MainWelcomeGui1
{
JFrame frame = new JFrame();
JButton b1 ;
JButton b2 ;
JButton b3 ;
JButton b4 ;
JButton b5 ;
JButton b6 ;
JButton b7 ;
JButton b8 ;
JButton b9 ;
JButton b10 ;
JButton b11 ;
JButton b12 ;
private String fName;
private String sName;
private String gender;
private String pLevel;
private String empIDnumber;
private int dPayLevel;
private static ArrayList<Employee> allEmployees = new ArrayList<Employee>();
private static ArrayList<Department> allDepartments = new ArrayList<Department>();
public MainWelcomeGui1()
{
frame.setTitle("Human Resources allocation screen");
JLabel hdr = new JLabel ("Welcome to the Human Resources employee control system");
b1 = new JButton ("Add a new department");
ButtonListener listener = new ButtonListener();
b1.addActionListener(listener);
// addDepartmentToSystem();
b2 = new JButton ("Add a new employee to the system");
ButtonListener listener1 = new ButtonListener();
b2.addActionListener(listener1);
b3 = new JButton ("Alter a employees details");
ButtonListener listener2 = new ButtonListener();
b3.addActionListener(listener2);
b4 = new JButton ("Add a employee to a department of my choice");
ButtonListener listener3 = new ButtonListener();
b4.addActionListener(listener3);
b5 = new JButton ("Assign a employee to a department");
b6 = new JButton ("Designate a employee as department head");
b7 = new JButton ("Delete a department");
b8 = new JButton ("To delete an employee from the system");
b9 = new JButton ("To see a list of all employees assigned to a particular department");
b10 = new JButton ("To see the amounts needed to be paid fortnightly");
b11 = new JButton ("To chane an employees pay level");
b12 = new JButton ("To change an employees name");
frame.setLayout (new GridLayout (6, 6));
frame.setBackground (Color.green);
frame.add(hdr,BorderLayout.NORTH);
frame.add (b1);
frame.add (b2);
frame.add (b3);
frame.add (b4);
frame.add (b5);
frame.add (b6);
frame.add (b7);
frame.add (b8);
frame.add (b9);
frame.add (b10);
frame.add (b11);
frame.add (b12);
frame.setSize(400, 100);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args)
{
new MainWelcomeGui1();
}
private class ButtonListener implements ActionListener
{
public void actionPerformed (ActionEvent e )
{
if (e.getSource() == b1)
{
guiDepartment guiDepartment = new guiDepartment();
System.out.println("i should really come after bob the builder");
addDepartmentToSystem();
}
else if (e.getSource() == b2)
{
guiEmployee1 theGuiEmployee = new guiEmployee1();
}
else if (e.getSource() == b3)
{
System.out.println("hello1 button 2");
}
else if (e.getSource() == b4)
{
System.out.println("hello button 3");
}
else if (e.getSource() == b5)
{
guiEmployee1 theGuiEmployee = new guiEmployee1();
}
else if (e.getSource() == b6)
{
System.out.println("hello1 button 2");
}
else if (e.getSource() == b7)
{
System.out.println("hello button 3");
}
}
}
public void addDepartmentToSystem()
{
Department departmentToAdd = new Department("berel","sam") ;
System.out.println("to two");
System.out.println(departmentToAdd);
departmentToAdd = guiDepartment.getDepartment();
System.out.println("got to three");
allDepartments.add(departmentToAdd);
System.out.println("to four+");
System.out.println(allDepartments);
}
}
答案 0 :(得分：5)
你不应该让JFrame启动其他JFrame，特别是如果你希望子窗口像一个模态对话框一样 - 一个对话框，它会停止启动窗口中的代码，直到完全处理完为止。在这种情况下，通过使用模态JDialogs代替对话框窗口的JFrames，使对话框窗口对话框。
例如：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MainWelcomeGui2 {
public static void main(String[] args) {
final JFrame frame = new JFrame("Main GUI");
JButton addDeptButtonLaunchJFrame = new JButton(
"Add a New Department, Launch JFrame");
JButton addDeptButtonLaunchJDialog = new JButton(
"Add a New Department, Launch JDialog");
addDeptButtonLaunchJDialog.addActionListener(new LaunchJDialogListener(
frame));
addDeptButtonLaunchJFrame.addActionListener(new LaunchJFrameListener());
JPanel panel = new JPanel();
panel.add(addDeptButtonLaunchJDialog);
panel.add(addDeptButtonLaunchJFrame);
frame.add(panel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
class LaunchJDialogListener implements ActionListener {
JDialog dialog;
public LaunchJDialogListener(JFrame parentFrame) {
JButton doneButton = new JButton(new AbstractAction("Done") {
public void actionPerformed(ActionEvent e) {
dialog.dispose();
}
});
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(100, 100));
panel.add(doneButton);
dialog = new JDialog(parentFrame, "Dialog", true);
dialog.add(panel);
dialog.pack();
dialog.setLocationRelativeTo(null);
}
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("called before setting dialog visible");
dialog.setVisible(true);
System.out
.println("called after setting dialog visible. Note that this line doesn't show until the dialog disappears");
}
}
class LaunchJFrameListener implements ActionListener {
JFrame frame;
public LaunchJFrameListener() {
JButton doneButton = new JButton(new AbstractAction("Done") {
public void actionPerformed(ActionEvent e) {
frame.dispose();
}
});
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(100, 100));
panel.add(doneButton);
frame = new JFrame("JFrame");
frame.add(panel);
frame.pack();
frame.setLocationRelativeTo(null);
}
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("called before setting frame visible");
frame.setVisible(true);
System.out
.println("called after setting frame visible. Note that this line shows up immediately.");
}
}