java - 在 GUI 上更改颜色

Question

public ATMgui1() 
{
    setTitle("ATM Transactions");
    setSize(WIDTH, HEIGHT);
    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    JPanel contentPane = new JPanel();

    contentPane.setBackground(Color.PINK);
    setContentPane(contentPane);
    contentPane.setOpaque(false);

    JLabel pinLabel = new JLabel("Enter your Pin:");
    pinLabel.setOpaque(false);
    pinTextField = new JTextField();
    JButton pinButton = new JButton( "EnterPin OK");
    pinButton.setOpaque(false);

    JLabel pinChangeLabel = new JLabel("Enter your new Pin:");
    JTextField pinChangeTextField = new JTextField();
    JButton pinChangeButton = new JButton( "Change Pin");

    JButton exitButton = new JButton("EXIT");
    exitButton.addActionListener(e -> this.dispose());

    pinButton.addActionListener(this);

    JPanel pinPanel = new JPanel();
    pinPanel.setLayout(new GridLayout(3, 3));
    pinPanel.add(pinLabel);
    pinPanel.add(pinTextField);
    pinPanel.add(pinButton);
    pinPanel.add(pinChangeLabel);
    pinPanel.add(pinChangeTextField);
    pinPanel.add(pinChangeButton);

    pinPanel.add(exitButton);

    contentPane.add(pinPanel, BorderLayout.CENTER);

我尝试更改背景，但并没有完全改变，代码到处都是，我认为只有一个部分才是我正在努力解决的问题。

Answer 1

你看到了什么:

包含组件、JTextFields、标签和按钮的 JPanel 应该是透明的。对其调用 .setOpaque(false)，您应该会看到它下面的颜色。

例如:

import java.awt.Color;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class PinkBackground {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JPanel panel = new JPanel();
            panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));
            panel.add(new JTextField(10));
            panel.add(Box.createVerticalStrut(15));
            panel.add(new JTextField(10));
            panel.setBorder(BorderFactory.createEmptyBorder(15, 15, 15, 15));

            // panel.setOpaque(false);  // ******* uncomment this! **********

            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.getContentPane().setBackground(Color.PINK);
            frame.add(panel);
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        });
    }
}

使您的 pinPanel 不透明。 contentPane，您设置为粉红色的组件应保持不透明:

public ATMgui1() {

    setTitle("ATM Transactions");
    setSize(WIDTH, HEIGHT);
    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    JPanel contentPane = new JPanel();

    contentPane.setBackground(Color.PINK);
    setContentPane(contentPane);

    JLabel pinLabel = new JLabel("Enter your Pin:");
    // pinLabel.setOpaque(false);
    pinTextField = new JTextField();
    JButton pinButton = new JButton("EnterPin OK");
    // pinButton.setOpaque(false);

    JLabel pinChangeLabel = new JLabel("Enter your new Pin:");
    JTextField pinChangeTextField = new JTextField();
    JButton pinChangeButton = new JButton("Change Pin");

    JButton exitButton = new JButton("EXIT");
    exitButton.addActionListener(e -> this.dispose());

    pinButton.addActionListener(this);

    JPanel pinPanel = new JPanel();
    pinPanel.setOpaque(false); // !!
    pinPanel.setLayout(new GridLayout(3, 3));
    pinPanel.add(pinLabel);
    pinPanel.add(pinTextField);
    pinPanel.add(pinButton);
    pinPanel.add(pinChangeLabel);
    pinPanel.add(pinChangeTextField);
    pinPanel.add(pinChangeButton);

    pinPanel.add(exitButton);

    contentPane.add(pinPanel, BorderLayout.CENTER);
}