JLabel and swap the text it holds via the JLabel's setText(…) method

问题

The question field should contain 36 questions, the answer to these question are on the 36 buttons in the grid.

i am having a problem getting question field to display 36 question starting with what is 0 + 1 when the user clicks the correct button it then shows question 2 shows in the field which is what is 1+1 and so till question 36

so how do i get one question JLabel and swap the text it holds via the JLabel's setText(...) method

here is my code

import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
import java.util.*;
import javax.swing.*;
class NewClass {
    final int ROWS = 6;
    final int COLUMNS = 6;
    JButton[] buttons = new JButton[ROWS*COLUMNS];
    JLabel statusLabel = new JLabel("",JLabel.CENTER);
    java.util.List<Integer> buttonNumbers = new ArrayList<Integer>();
    int buttonCounter = 1;
    public NewClass()  {
        JPanel buttonPanel = new JPanel(new GridLayout(ROWS,COLUMNS));
        ButtonListener listener = new ButtonListener(NewClass.this);
        for(int x = 0, y = ROWS*COLUMNS; x < y; x++){
            buttons[x] = new JButton();
            buttons[x].addActionListener(listener);
            buttonPanel.add(buttons[x]);
            buttonNumbers.add(new Integer(x+1));
        }
        reset();
        JFrame frame = new JFrame();
        frame.getContentPane().add(statusLabel,BorderLayout.NORTH);
        frame.getContentPane().add(buttonPanel,BorderLayout.CENTER);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
    public void reset(){
        Collections.shuffle(buttonNumbers);
        for(int x = 0, y = ROWS*COLUMNS; x < y; x++){
            buttons[x].setText(String.valueOf(buttonNumbers.get(x)));
        }
        buttonCounter = 1;
        statusLabel.setText("what is 0+ 1  " + buttonCounter);
    }
    public static void main(String[] args) {
        new NewClass();
    }
}
class ButtonListener implements ActionListener {
    NewClass gui;
    ButtonListener(NewClass g){
        gui = g;
    }
    public void actionPerformed(ActionEvent e) {
        JButton buttonClicked = (JButton)e.getSource();
        int clickedNumber = Integer.parseInt(buttonClicked.getText());
        if(clickedNumber == gui.buttonCounter){
            gui.buttonCounter++;
            buttonClicked.setText("");//optional - clears correct selection
            if(gui.buttonCounter > gui.ROWS*gui.COLUMNS) gui.reset();
            gui.statusLabel.setText("what is 0+ 1" + gui.buttonCounter);
        }
        else {
            gui.reset();
            gui.statusLabel.setText("Incorrect button clicked, start again: what is 0+ 1");
        }
    }
}

回答1:

Change one line of code in the action listener. Change this:

gui.statusLabel.setText("what is 0+ 1" + gui.buttonCounter);

to this:

gui.statusLabel.setText("what is " + gui.buttonCounter + "+ 1");

Now it will ask:

what is 0+ 1
what is 1+ 1
what is 2+ 1
what is 3+ 1

..........................................
what is 1937655087345+ 1

来源：https://stackoverflow.com/questions/22977030/jlabel-and-swap-the-text-it-holds-via-the-jlabels-settext-method

标签

java

arrays

swing

jbutton