本文介绍了如何在不等待用户的 Gui 输入的情况下阻止 Java 运行整个代码的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我对 Java 很陌生，我只是在寻求一点帮助
我正在尝试创建一个程序，该程序允许用户以 gui 的形式输入百货商店的名称和位置.它允许这样做，但程序不会等待输入 >details 它只是初始化 Gui 类并简单地继续 >processing 将输入到 Gui 中的详细信息添加到数组列表中.但是尚未输入>详细信息，因此它正在创建一个空值，因为它已经>向前跳跃.
Im fairly new to Java and im just looking for a little help
Im trying to create a program which allows the user to enter as a gui the name and> >location of a department store. It allows this but the program does not wait for the >details to be entered it just initializes the Gui class and simply continues on with the >processing Which is to add the details entered into the Gui into an array list. But the >details have not yet been entered yet so it is creating a null value because it has jumped >ahead.
那么我怎样才能让它停止并等到输入值然后提交呢?
So how can I make it stop and wait till the values have been entered and then submitted?
这里是代码的 Gui 组件:
Here is the Gui component of the code:
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);
}
}
推荐答案
你不应该让一个 JFrame 启动其他 JFrame，尤其是如果你希望子窗口表现得像一个模态对话框——一个暂停代码的对话框启动窗口，直到它被完全处理.在这种情况下，通过使用模态 JDialogs 代替对话框窗口的 JFrames 来制作对话框窗口 dialogs.
You shouldn't have a JFrame launching other JFrames, especially if you want the child windows to behave as a modal dialogs -- a dialog that halts the code in the launching window until it has been fully dealt with. When this is the case, make the dialog windows dialogs by using modal JDialogs in place of JFrames for the dialog windows.
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.");
}
}
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