[英]Understanding “ImageIO.read(getClass().getResource(path))”
My question is about the following code-example: 我的问题是关于以下代码示例:
public class BufferedImageLoader {
private BufferedImage image;
public BufferedImage loadImage(String path) throws IOException {
image = ImageIO.read(getClass().getResource(path));
return image;
}
}
I looked in the Java-API and found 3 different read() methods in the ImageIO Class: 我查看了Java-API并在ImageIO类中找到了3种不同的read()方法:
1.: read(File input) 1:读(文件输入)
2.: read(ImageInputStream stream) 2:read(ImageInputStream流)
3.: read(InputStream input) 3:读(InputStream输入)
4.: read(URL input) 4:读取(URL输入)
My question is: Which of them four methods is used in this example? 我的问题是:在这个例子中使用了哪四种方法? I'm a little bit confused, because in the example stands 我有点困惑,因为在示例中站立
read(getClass().getResource(path));
"getClass()" returns here "BufferedImageLoader", right? “getClass()”在这里返回“BufferedImageLoader”,对吧? Then we call the method "read(getClass().getResource(path))", which must stand in the BufferedImageLoader Class, but this is not the case! 然后我们调用方法“read(getClass()。getResource(path))”,它必须位于BufferedImageLoader类中,但事实并非如此!
Where i'm wrong? 哪里我错了?
getClass().getResource(path))
returns a URL
, so in this case, it would using ImageIO.read(URL)
getClass().getResource(path))
返回一个URL
,所以在这种情况下,它会使用ImageIO.read(URL)
In addition, if you used Class#getResourceAsInputStream
, it would return an InputStream
, meaning it would be using ImageIO.read(InputStream)
instead 另外,如果您使用Class#getResourceAsInputStream
,它将返回一个InputStream
,这意味着它将使用ImageIO.read(InputStream)
代替
getClass() returns an typed instance of java.lang.Class , in your case Class<? extends BufferedImageLoader>
getClass()返回java.lang.Class的类型化实例,在你的情况下Class<? extends BufferedImageLoader>
Class<? extends BufferedImageLoader>
which represent the BufferedImageLoader
class. Class<? extends BufferedImageLoader>
,它代表BufferedImageLoader
类。 This method is inherited from java.lang.Object and returns the runtime class of the object. 此方法继承自java.lang.Object并返回该对象的运行时类。
The getResource(path) method of java.lang.Class
returns an instance of java.net.URL java.lang.Class
的getResource(path)方法返回java.net.URL的实例
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