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I am trying to simulate a coin flipper using Java and window builder. I have a button called "Flip" when that button is pressed the coin image changes depending on which number the random generator I created generates.

I now am trying to figure out a way to display the number of times the coin lands a heads or a tails in their respective JTextFields. I was thinking of using a counter, but I am struggling with how to update that into the text field, so far it only puts in that I have flipped each coin once.

I am very new to programming so any advice or guidance is much appreciated.

// this button flips the coin
btnFlip = new JButton("Flip");
btnFlip.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent arg0) {
        int headCounter = 0;
        int tails = 0; 
        // this implements the random flip of the coin when the checkbox Run Multiple
        // flips is unchecked
        if (chckbxNewCheckBox.isSelected() == false) {

            Random r = new Random();
            int flipper = r.nextInt(2);
            if (flipper == 1) { 
                lblImages.setIcon(new ImageIcon(FinalPrep.class.getResource("/finalPrep/heads.png")));
                textFieldHeads.setText(String.valueOf(headCounter));

            } else {
                lblImages.setIcon(new ImageIcon(FinalPrep.class.getResource("/finalPrep/tails.png")));
                textFieldTails.setText(String.valueOf(tails));
            }
        }
    }
});
btnFlip.setFont(new Font("Tahoma", Font.PLAIN, 15));
panel_1.add(btnFlip);
DAIRAV
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amiej33
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  • Please post some of your code. It is hard to give an answer without it. – agillgilla Jul 30 '18 at 21:05
  • Perhaps something like this: declare two class fields of integer data type, one named **HEADS** and the other named **TAILS**. These would be considered Class Global, initialize both to 0. Random should be either 0 or 1 and is generated upon the button click. If random value = **0** then `TAILS++;`. If random value = **1** then `HEADS++;`. The JTextFields could very well be JLabels since they're only used for display purposes, never the less, at the end but within the button click event: `headsTextField.setText(String.valueOf(HEADS));` and `tailsTextField.setText(String.valueOf(TAILS));`. – DevilsHnd - 退職した Jul 30 '18 at 21:17
  • Hmm, @DevilsHnd I had the same thought, maybe I am not writing all the code correctly. I am going to post what I have so far. – amiej33 Jul 30 '18 at 21:31
  • Good idea @AmieJensen. That way we can see where the problem may be lurking. – DevilsHnd - 退職した Jul 30 '18 at 21:33
  • @DevilsHnd Ok there is what I thought could potentially work and after I set the textField to the counter I originally had headCounter++; but it only incremented the heads textfield to one and stayed that way even when I pressed flip again and again – amiej33 Jul 30 '18 at 21:39
  • @DevilsHnd goodness! I reread your first comment and I was declaring and initializing with in the button method. I only needed to do what you said and make the fields that way they are global, now they work :) thank you for your help, much appreciated – amiej33 Jul 30 '18 at 21:42
  • Exactly! :) Glad that worked out for you. – DevilsHnd - 退職した Jul 30 '18 at 21:47
  • Well the by far easiest solution would be to simply put the two variables as fields into your anonymous class instead of making them local to the method. – Voo Jul 31 '18 at 06:46

1 Answers1

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You have to create something like 2 layers. One that contains the window itself along with the title (think of it like a receptor) then you have to create another "layer" that contains the buttons and the textfields. Something like this:

import javax.swing.*;

public class MyFrame extends JFrame {

    private JPanel panel;
    private JTextField textField;
    private JButton button;

    public MyFrame(){

        panel = new JPanel(); //Step 1. Creation of a receptor

        tfCount = new JTextField(10); //Step 2.
        button = new JButton("Press Me"); //Creation of buttons & textfields.

        panel.add(tfCount); //Step 3.
        panel.add(button); //Add those graphics to the receptor  

        this.setContentPane(panel); //Step 4 Adjust the receptor to the object

        this.setVisible(true);
        this.setSize(400, 400);
        this.setTitle("My 1st GUI!");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

(Sorry for the random example but you did not post any sample of code so I am trying to explain as best as I can)

Then you should put a "flag" depending of the number that was generated for example:

    boolean flag = true; //Flag

    int counter = 0; //The counter for the heads

    int x; //The number you received from the generator

    int counter_b; //The counter for the tails

    if(x%2 == 0){ //If the number is even
        flag = false; // You set down the flag
        counter++; //And counter raises its value
    }
    else
        counter_b++;


    tfCount.setEditable(true); //This makes your textfield editable
    tfCount.setText(String.valueOf(counter)); //And this prints the counter's value

Keep in mind that the counters for the tails and the heads are just examples for you to understand how to use "flags". I hope that I was able to help you because I am new too!! :)

Stavros
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