我想在 Jframe 中添加背景图像 [重复]

Question

我只是在制作 kmap 程序，但代码有问题。我使用 JFrame，在其上使用 JLabel 设置背景图像，并使用另一个 JPanel，在其上使用 gridlayout 制作 4x4 表格。我添加了两个 JButton 计算和重置以及 8 个指示位置的 JLabel（A'B' 等）。但是背景图片出现在按钮标签和表格的前面。

package kmap;

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

class kmapping extends JFrame {

    static String output = "";
    static int Arr[][] = new int[4][4];
    static int checked[][] = new int[4][4];
    static int value[] = new int[16];
    JButton btn[] = new JButton[16];
    JLabel lbl[] = new JLabel[10];
    JPanel table;
    ;
        JLabel text, bg;
    JButton compute, reset;

    kmapping() {
        JFrame f = new JFrame();
        f.setTitle("KARNAUGH MAP");
        f.setSize(580, 430);
        f.setVisible(true);
        f.setLocation(300, 50);
        f.setDefaultCloseOperation(EXIT_ON_CLOSE);
        f.setResizable(false);
        f.setLayout(null);
        bg = new JLabel(new ImageIcon("C:\\Documents and Settings\\user\\My Documents\\NetBeansProjects\\kmap\\background.png"));
        bg.setBounds(0, 0, 579, 429);
        f.add(bg);
        table = new JPanel();
        text = new JLabel();
        table.setBounds(140, 30, 400, 300);
        table.setBackground(Color.white);

        text.setBounds(50, 300, 620, 110);
        text.setBackground(Color.blue);
        //adding button in table
        table.setLayout(new GridLayout(4, 4));

        for (int i = 0; i < 16; i++) {
            btn[i] = new JButton();
            btn[i].setIcon(new ImageIcon("C:\\Documents and Settings\\user\\My Documents\\NetBeansProjects\\kmap\\images\\x.png"));
            table.add(btn[i]);
            table.validate();
            value[i] = 2;
        }
        //
        lbl[0] = new JLabel("A'B'");
        lbl[0].setBounds(110, 30, 30, 75);
        f.add(lbl[0]);
        lbl[1] = new JLabel("A'B");
        lbl[1].setBounds(110, 105, 30, 75);
        f.add(lbl[1]);
        lbl[2] = new JLabel("AB");
        lbl[2].setBounds(110, 180, 30, 75);
        f.add(lbl[2]);
        lbl[3] = new JLabel("AB'");
        lbl[3].setBounds(110, 255, 30, 75);
        f.add(lbl[3]);
        lbl[4] = new JLabel("C'D'");
        lbl[4].setBounds(160, 0, 80, 30);
        f.add(lbl[4]);
        lbl[5] = new JLabel("C'D");
        lbl[5].setBounds(260, 0, 80, 30);
        f.add(lbl[5]);
        lbl[6] = new JLabel("CD");
        lbl[6].setBounds(360, 0, 80, 30);
        f.add(lbl[6]);
        lbl[7] = new JLabel("CD'");
        lbl[7].setBounds(460, 0, 80, 30);
        f.add(lbl[7]);
        f.validate();

        compute = new JButton("COMPUTE");
        compute.setBounds(5, 100, 100, 40);
        f.add(compute);
        reset = new JButton("RESET");
        reset.setBounds(5, 160, 100, 40);
        f.add(reset);
        f.add(table);
        compute.validate();
        reset.validate();
        f.add(text);
        f.validate();

Answer 1

try this ..thanks  


1. Create a subclass of JComponent.
2. Override the paintComponent(Graphics g) method to paint the image that you want to display.
3. Set the content pane of the JFrame to be this subclass.
   // elsewhere

      BufferedImage myImage = ImageIO.load(...);
        JFrame myJFrame = new JFrame("Image pane");
        myJFrame.setContentPane(new ImagePanel(myImage));

Answer 2

别担心，问题是你的背景 JLabel 应该是你放在构造函数上的最后一件事 不需要做大的改变 试试这个希望它有效，根据我的经验，我总是这样做我的 JFrame 上的地面图像。

package kmap;

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

class kmapping extends JFrame {

static String output = "";
static int Arr[][] = new int[4][4];
static int checked[][] = new int[4][4];
static int value[] = new int[16];
JButton btn[] = new JButton[16];
JLabel lbl[] = new JLabel[10];
JPanel table;
;
    JLabel text, bg;
JButton compute, reset;

kmapping() {
    JFrame f = new JFrame();
    f.setTitle("KARNAUGH MAP");
    f.setSize(580, 430);
    f.setVisible(true);
    f.setLocation(300, 50);
    f.setDefaultCloseOperation(EXIT_ON_CLOSE);
    f.setResizable(false);
    f.setLayout(null);
    table = new JPanel();
    text = new JLabel();
    table.setBounds(140, 30, 400, 300);
    table.setBackground(Color.white);

    text.setBounds(50, 300, 620, 110);
    text.setBackground(Color.blue);
    //adding button in table
    table.setLayout(new GridLayout(4, 4));

    for (int i = 0; i < 16; i++) {
        btn[i] = new JButton();
        btn[i].setIcon(new ImageIcon("C:\\Documents and Settings\\user\\My Documents\\NetBeansProjects\\kmap\\images\\x.png"));
        table.add(btn[i]);
        table.validate();
        value[i] = 2;
    }
    //
    lbl[0] = new JLabel("A'B'");
    lbl[0].setBounds(110, 30, 30, 75);
    f.add(lbl[0]);
    lbl[1] = new JLabel("A'B");
    lbl[1].setBounds(110, 105, 30, 75);
    f.add(lbl[1]);
    lbl[2] = new JLabel("AB");
    lbl[2].setBounds(110, 180, 30, 75);
    f.add(lbl[2]);
    lbl[3] = new JLabel("AB'");
    lbl[3].setBounds(110, 255, 30, 75);
    f.add(lbl[3]);
    lbl[4] = new JLabel("C'D'");
    lbl[4].setBounds(160, 0, 80, 30);
    f.add(lbl[4]);
    lbl[5] = new JLabel("C'D");
    lbl[5].setBounds(260, 0, 80, 30);
    f.add(lbl[5]);
    lbl[6] = new JLabel("CD");
    lbl[6].setBounds(360, 0, 80, 30);
    f.add(lbl[6]);
    lbl[7] = new JLabel("CD'");
    lbl[7].setBounds(460, 0, 80, 30);
    f.add(lbl[7]);
    f.validate();

    compute = new JButton("COMPUTE");
    compute.setBounds(5, 100, 100, 40);
    f.add(compute);
    reset = new JButton("RESET");
    reset.setBounds(5, 160, 100, 40);
    f.add(reset);
    f.add(table);
    compute.validate();
    reset.validate();
    f.add(text);
    f.validate();
//Setting up the background
bg = new JLabel(new ImageIcon("C:\\Documents and Settings\\user\\My  Documents\\NetBeansProjects\\kmap\\background.png"));
    bg.setBounds(0, 0, 579, 429);
    f.add(bg);

这现在可以工作了，你所有的组件都将在你的背景之上