How to determine whether a file is empty in java

在File类中并没有提供判断文件是否为空的方法，但可以借助length()方法的返回值进行判断。

length()方法定义为：

public long length()

如果文件不存在或文件为空时，length()方法返回0。

示例代码：

	File file = new File("D:\\test.txt");
	if(file.exists() && file.length)() == 0) {
		System.out.println("文件为空！");
	}

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