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try() {} catch {} ===> try with resources资源自动释放

try with resources资源自动释放特性

@org.junit.Test
public void testTryCatchSource() {
	try(
		InputStream fis = new FileInputStream(sourceFile);
		OutputStream fos = new FileOutputStream(targetFile)
	) {
		byte[] buf = new byte[8192];
		int i;
		while ((i = fis.read(buf)) != -1) {
			fos.write(buf, 0, i);
		}
	        
	} catch (Exception e) {
		e.printStackTrace();
	}
}

在 try 代码块退出的时候会自动调用相应的 close() 方法，关闭相应资源