Question

我正在学习Java课程，我们正在学习Swing（我知道，我知道，JavaFX是最新的......）。无论如何，我有GridBagLayout工作，但由于某种原因我的JMenuBar不会显示背景颜色。我做了一些挖掘，但没有找到任何东西。这是我的代码：

package com.company;

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

public class BasicGraphics {

public static void main(String[] args) {
    JFrame myframe = new JFrame("Pleasant's GUI");
    myframe.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    JMenuBar myMenu = new JMenuBar();
    myMenu.setBackground(Color.ORANGE);
    myMenu.setOpaque(true);
    myMenu.setPreferredSize(new Dimension(400,25));
    myframe.setJMenuBar(myMenu);
    Container contents = myframe.getContentPane();
    contents.setBackground(Color.blue);
    contents.setLayout(new GridBagLayout());
    GridBagConstraints c = new GridBagConstraints();
    c.fill = GridBagConstraints.HORIZONTAL;
    c.ipadx = 5;
    JLabel lblName = new JLabel("Name");
    c.gridx = 0;
    c.gridy = 0;
    c.weightx = 0.33;
    contents.add(lblName, c);
    JTextField tfName = new JTextField("Enter Name", 20);// columns and text
    c.gridx = 1;
    c.gridy = 0;
    c.weightx = 1;
    contents.add(tfName, c);
    JLabel lblPwd = new JLabel("Password");
    c.gridx = 0;
    c.gridy = 1;
    c.weightx = 0.33;
    contents.add(lblPwd, c);
    JPasswordField pwdPassWord = new JPasswordField(10);
    c.gridx = 1;
    c.gridy = 1;
    c.weightx = 1;
    contents.add(pwdPassWord, c);
    JLabel lblGender = new JLabel("Gender");
    c.gridx = 0;
    c.gridy = 2;
    c.weightx = 0.33;
    contents.add(lblGender, c);
    ButtonGroup bgGender = new ButtonGroup();
    JRadioButton rbMale = new JRadioButton("Male");
    JRadioButton rbFemale = new JRadioButton("Female");
    bgGender.add(rbMale);
    bgGender.add(rbFemale);
    c.gridx = 1;
    c.gridy = 2;
    c.weightx = 0.5;
    contents.add(rbMale, c);
    c.gridy = 3;
    contents.add(rbFemale, c);
    //add to panel and show flow layout by changing order
    //& resize window.  Change BorderLayout to CENTER
    myframe.pack();
    myframe.setVisible(true);
}
}

谢谢！

Answer 1

这是我的代码，它在窗口7中使用jdk 1.8，它也为JMenuBar以及JMenu着色。

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

    public class BasicGraphics
    {
        JFrame frame;
        JMenuBar menuBar;
        JMenu fileMenu;
        JMenu editMenu;
        public BasicGraphics()
        {
            frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            menuBar = new JMenuBar();
            menuBar.setOpaque(true);
            menuBar.setBackground(Color.BLUE);

            fileMenu = new JMenu("File");
            fileMenu.setBackground(Color.RED);

            editMenu = new JMenu("Edit");
            editMenu.setBackground(Color.YELLOW);

            menuBar.add(fileMenu);
            menuBar.add(editMenu);

            frame.setJMenuBar(menuBar);
            frame.setVisible(true);
            frame.pack();
        }
        public static void main(String args[]) {
            new BasicGraphics();
    }
 }

setOpaque(true);绝对是有效的，它为JMenuBar着色，我不明白为什么你的计算机无法正常工作。你的代码也是橙色JMenuBar的颜色。这里是图像

JMenuBar背景颜色不显示

1 个答案: