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);

    }

}