HaE/src/main/java/hae/utils/UIEnhancer.java

package hae.utils;

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

public class UIEnhancer {
    public static void setTextFieldPlaceholder(JTextField textField, String placeholderText) {
        textField.setForeground(Color.GRAY);
        textField.setText(placeholderText);
        textField.addFocusListener(new FocusListener() {
            @Override
            public void focusGained(FocusEvent e) {
                if (textField.getText().equals(placeholderText)) {
                    textField.setText("");
                    textField.setForeground(Color.BLACK);
                }
            }

            @Override
            public void focusLost(FocusEvent e) {
                if (textField.getText().isEmpty()) {
                    textField.setForeground(Color.GRAY);
                    textField.setText(placeholderText);
                }
            }
        });
    }
}