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); 

我试图改变的背景，但它没有彻底改变，代码是有点所有的地方，我认为这只是一个部分，其实就是我挣扎。

Answer 1

你看到什么：

JPanel的持有你的组件，你的JTextField中，标签和按钮应该由非不透明的。打电话给.setOpaque(false)，你应该看到它下面的颜色。

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); 
     }); 
    } 
} 

让您pinPanel非不透明。的contentPane，那你设置粉色应保持不透明组件：

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); 
}