[英]I can't make my program to wait until GUI has finished gathering requested info (Java)
I am quite new to Java and before I end up asking this question I searched and searched SO, but I don't seem to get my head around it. 我对Java还是很陌生,在最终问这个问题之前,我进行了搜索和SO搜索,但是我似乎并没有解决这个问题。 As you will see I have a class that creates a GUI, asks for some input and stores that input in a returnable String[].
正如您将看到的,我有一个创建GUI的类,要求提供一些输入并将该输入存储在可返回的String []中。
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class InputConsole {
final static boolean shouldFill = true;
final static boolean shouldWeightX = true;
final static boolean RIGHT_TO_LEFT = false;
public static String[] details = new String[3];
public static JButton btn2013;
public static JButton btn2014;
public static JButton btn2015;
public static JButton btn2016;
public static JButton btnGo;
public static JTextField textField2;
public static JTextField textField4;
public static void addComponentsToPane(Container pane) {
if (RIGHT_TO_LEFT) {
pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
}
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
if (shouldFill) {
c.fill = GridBagConstraints.HORIZONTAL;
}
btn2013 = new JButton("ZMR 2013");
btn2013.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
details[2] = "2013";
btn2014.setEnabled(false);
btn2015.setEnabled(false);
btn2016.setEnabled(false);
textField2.requestFocusInWindow();
}
});
if (shouldWeightX) {
c.weightx = 0.0;
}
c.fill = GridBagConstraints.HORIZONTAL;
c.insets = new Insets(10, 0, 0, 0);
c.gridx = 0;
c.gridy = 0;
pane.add(btn2013, c);
btn2014 = new JButton("ZMR 2014");
btn2014.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
details[2] = "2014";
btn2013.setEnabled(false);
btn2015.setEnabled(false);
btn2016.setEnabled(false);
textField2.requestFocusInWindow();
}
});
c.fill = GridBagConstraints.HORIZONTAL;
c.insets = new Insets(10, 10, 0, 0);
c.weightx = 0.0;
c.gridx = 1;
c.gridy = 0;
pane.add(btn2014, c);
btn2015 = new JButton("ZMR 2015");
btn2015.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
details[2] = "2015";
btn2013.setEnabled(false);
btn2014.setEnabled(false);
btn2016.setEnabled(false);
textField2.requestFocusInWindow();
}
});
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0.0;
c.gridx = 2;
c.gridy = 0;
pane.add(btn2015, c);
btn2016 = new JButton("ZMR 2016");
btn2016.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
details[2] = "2016";
btn2013.setEnabled(false);
btn2014.setEnabled(false);
btn2015.setEnabled(false);
textField2.requestFocusInWindow();
}
});
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0.0;
c.gridx = 3;
c.gridy = 0;
pane.add(btn2016, c);
JLabel textField1 = new JLabel("What was your Bib number? : ");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 2;
pane.add(textField1, c);
textField2 = new JTextField(10);
textField2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
details[0] = textField2.getText();
textField4.requestFocusInWindow();
}
});
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 2;
c.gridy = 2;
pane.add(textField2, c);
JLabel textField3 = new JLabel("What is your email address : ");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 3;
c.gridwidth = 2;
pane.add(textField3, c);
textField4 = new JTextField(15);
textField4.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
details[1] = textField4.getText();
btnGo.setEnabled(true);
btnGo.requestFocusInWindow();
}
});
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 2;
c.gridy = 3;
pane.add(textField4, c);
btnGo = new JButton("Go And Get Me My Diploma!");
btnGo.setEnabled(false);
btnGo.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null, details[0] + " " + details[1] + " " + details[2]);
}
});
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 0;
c.weighty = 1.0;
c.anchor = GridBagConstraints.PAGE_END;
c.insets = new Insets(10, 0, 0, 0);
c.gridx = 0;
c.gridwidth = 4;
c.gridy = 4;
pane.add(btnGo, c);
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("Zagori Mountain Running Diploma Maker");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addComponentsToPane(frame.getContentPane());
frame.pack();
frame.setSize(500, 250);
frame.setVisible(true);
}
public String[] inputBib() {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
return details;
}
But when I call this GUI in another class 但是当我在另一个类中调用此GUI时
public class CheckFiles {
InputConsole bibInput = new InputConsole();
String[] detailsInput = bibInput.inputBib();
private static Scanner scanner;
public String bibCorrected() {
String yearToCheck = null;
{
if (detailsInput[2] == "2016") {
yearToCheck = "ZMR2016.txt";
} else if (detailsInput[2] == "2015") {
yearToCheck = "ZMR2015.txt";
} else if (detailsInput[2] == "2014") {
yearToCheck = "ZMR2014.txt";
} else {
yearToCheck = "ZMR2013.txt";
in order to obtain that String[], I get a java.lang.NullPointerException. 为了获得该String [],我得到了一个java.lang.NullPointerException。 I Know that I get this because the program does not wait for the GUI to get all the input and files the returnable String[] as null.
我知道我得到这个信息是因为程序不等待GUI获取所有输入,而是将可返回的String []归档为null。 I think I know that I have to do something with wait() and notify() but I do not seem to understand exactly what.
我想我知道我必须对wait()和notify()做些事情,但是我似乎并不太清楚。 Thank you in advance for any suggestions.
预先感谢您的任何建议。 (and very sorry for the long thread)
(对于长线程非常抱歉)
You could add a button on your GUI which will just call the bibCorrected() method. 您可以在GUI上添加一个按钮,该按钮将仅调用bibCorrected()方法。 Currently you are showing and then returning so the array is empty and arg 2 is none existent therefor throwing an NPE.
当前,您正在显示,然后返回,因此该数组为空,并且不存在arg 2,因此不会抛出NPE。 This would probably be the easiest way to resolve the issue.
这可能是解决问题的最简单方法。
Also, it's better to use String.equals(String) rather than ==. 另外,最好使用String.equals(String)而不是==。 Read this StackOverflow post What is the difference between == vs equals() in Java?
阅读此StackOverflow帖子, 在Java中==与equals()之间有什么区别?
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