Java 8/Eclipse 图像不可见

Question

我正在尝试获取一个小动画的图像，但面板保持白色。图像与类位于同一文件夹中。

public class JBallonPanel extends JPanel implements Runnable{

private Image img;

private int x, y;

JBallonPanel(){

    setBackground(Color.white);

    img=Toolkit.getDefaultToolkit().createImage(".//Ball.jpg");

    x=this.getWidth()/2;

    y=this.getHeight()/2;

}

public void paintComponent(Graphics g){

    g.drawImage(img, x, y, 

            img.getWidth(this), img.getWidth(this), this);

}

Answer 1

看看下面，我只是做了一些调整，但你的代码正在工作。    import java.awt.Color;    import java.awt.Graphics;    import java.awt.Image;    import java.awt.Toolkit;    import javax.swing.JFrame;    import javax.swing.JPanel;    import javax.swing.WindowConstants;    //public class JBallonPanel extends JPanel implements Runnable {    //You can remove implements Runnable    public class JBallonPanel extends JPanel {    private Image img;    private int x, y;    JBallonPanel(){        setBackground(Color.white);        // your path should have \\ for example C:\\Ball.jpg or C:\\myImageFolder\\Ball.jpg         // but in your case, it works too.        img=Toolkit.getDefaultToolkit().createImage("C:\\Ball.jpg");        x=this.getWidth()/2;        y=this.getHeight()/2;    }    public void paintComponent(Graphics g){        g.drawImage(img, x, y, img.getWidth(this), img.getWidth(this),     this);    }    //And run like this    public static void main(String[] args) {        JFrame frame = new JFrame();        frame.getContentPane().add(new JBallonPanel());        frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);        frame.pack();        frame.setSize(800, 800);        frame.setVisible(true);    }}