Java 如何使用swing添加图像，以及如何使其与窗口大小相同？

我尝试将图像添加到我的窗口，使其与窗口大小相同，但项目不会运行，也不会出现图像，当我在使用图像之前，它不会是屏幕的大小，即使我使用了窗口所用的

WIDTH

和

HEIGHT

import javax.swing.*;

public class Main {

    public static int WIDTH = 1000;
    public static int HEIGHT = 368;

    public static JFrame window = new JFrame();

    public static void main(String[] args) {
         CreateWindow();
    }

    public static void CreateWindow() {
        window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        window.setSize(WIDTH, HEIGHT);
        BackgroundImage();
        window.setVisible(true);
    }

    public static void BackgroundImage() {
        ImageIcon image = new ImageIcon("C:\\Users\\SamBr\\Pictures\\image.png");
        window.add(image)
        image.setSize(WIDTH, HEIGHT);
    }

}

---

使用

JLabel

显示图像，并使用

getScaledInstance（）

方法调整图像大小

import java.awt.Image;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.WindowConstants;

public class Main {

    public static int WIDTH = 1000;
    public static int HEIGHT = 368;

    public static JFrame window = new JFrame();

    public static void main(String[] args) {
        CreateWindow();
    }

    public static void CreateWindow() {
        window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        window.setSize(WIDTH, HEIGHT);
        BackgroundImage();
        window.pack();
        window.setVisible(true);
    }

    public static void BackgroundImage() {
        ImageIcon imageIcon = new ImageIcon("C:\\Users\\SamBr\\Pictures\\image.png");
        ImageIcon scaledImage = new ImageIcon(
                imageIcon.getImage().getScaledInstance(WIDTH, HEIGHT, Image.SCALE_SMOOTH));
        JLabel label = new JLabel();
        label.setIcon(scaledImage);
        window.add(label);
    }

}

---

使用

JLabel

显示图像，并使用

getScaledInstance（）

方法调整图像大小

import java.awt.Image;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.WindowConstants;

public class Main {

    public static int WIDTH = 1000;
    public static int HEIGHT = 368;

    public static JFrame window = new JFrame();

    public static void main(String[] args) {
        CreateWindow();
    }

    public static void CreateWindow() {
        window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        window.setSize(WIDTH, HEIGHT);
        BackgroundImage();
        window.pack();
        window.setVisible(true);
    }

    public static void BackgroundImage() {
        ImageIcon imageIcon = new ImageIcon("C:\\Users\\SamBr\\Pictures\\image.png");
        ImageIcon scaledImage = new ImageIcon(
                imageIcon.getImage().getScaledInstance(WIDTH, HEIGHT, Image.SCALE_SMOOTH));
        JLabel label = new JLabel();
        label.setIcon(scaledImage);
        window.add(label);
    }

}