Question

我在这个示例的最后一行调用drawImage（）时得到一个NullPointerException，即使我没有给它一个null变量。帮助将不胜感激。

    BufferedImage image = null;
    System.out.println(image);

    try {

        image = ImageIO.read(getClass().getResource("/gameobjects/diaz.jpg"));
        System.out.println("eter");

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    System.out.println(image);
    Graphics g = mainPanel.getGraphics();
    g.drawImage(image, 50, 50, null);

和堆栈跟踪：

null
eter
BufferedImage@6a5f6303: type = 5 ColorModel: #pixelBits = 24 numComponents = 3 color space = java.awt.color.ICC_ColorSpace@1c5d9084 transparency = 1 has alpha = false isAlphaPre = false ByteInterleavedRaster: width = 384 height = 216 #numDataElements 3 dataOff[0] = 2
Exception in thread "main" java.lang.NullPointerException
    at Main.<init>(Main.java:41)
    at Main.main(Main.java:17)

Answer 1

我认为您需要将"/gameobjects/diaz.jpg"更改为"gameobjects/diaz.jpg'而不使用前导＆＃39; /＆＃39;。如果是这样的话，因为与绝对资源路径相比，它具有相对资源路径。＆＃39; /＆＃39;指定绝对，所以它正在寻找C：/ game ...（在Windows上）而不是/ game ...

从Java中的Graphics.drawImage获取NullPointerException

1 个答案: