Why Doesn't My JFormattedTextField Clear Properly in a Sudoku Solver?

JFormattedTextField is not properly cleared

Problem Statement:

In a sudoku solver application, the text boxes designed to display each cell's value do not properly clear when invalid values are entered. Even after setting an invalid value to 0, the previous valid value reappears when tabbing forward.

Issue Analysis:

The issue seems to arise from the assignment of "SudokuTextBox extends JFormattedTextField." This results in a JFormattedTextField for each TextBox, which enforces specific formatting rules and validation. In the case of Sudoku, only single integer values are allowed.

Potential Solution:

To overcome this limitation and allow for custom validation while still maintaining the desired square shape and single-integer input restriction, it is recommended to use a custom component that extends JPanel or another more suitable container. This approach provides greater control over input handling.

Here's an example of a custom component that mimics the behavior of a JFormattedTextField with enhanced input handling:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SudokuTextBox extends JPanel {

    private JTextField textField;

    public SudokuTextBox() {
        textField = new JTextField();
        textField.setHorizontalAlignment(JTextField.CENTER);
        textField.setInputVerifier(new InputVerifier() {
            @Override
            public boolean verify(JComponent input) {
                String text = ((JTextField) input).getText();
                return text.matches("[1-9]");
            }
        });

        this.add(textField, BorderLayout.CENTER);
        this.setPreferredSize(new Dimension(32, 32));
    }

    public String getText() {
        return textField.getText();
    }

    public void setText(String text) {
        textField.setText(text);
    }
}

This custom component enforces the validation of single-integer input using an InputVerifier. It also maintains the square shape and a centered text field to simulate the appearance of JFormattedTextField while allowing for flexible input handling.

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