Java是一门面向对象编程语言，不仅吸收了C++语言的各种优点，还摒弃了C++里难以理解的多继承、指针等概念，因此Java语言具有功能强大和简单易用两个特征。
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。如果文件不存在或文件为空时，length()方法返回0。
File file = new File("D:\\test.txt");
if(!file.exists() || file.length)() == 0) {
System.out.println("文件为空！");
}Java文件类以抽象的方式代表文件名和目录路径名。File类主要用于文件和目录的创建、文件的查找和文件的删除等。File对象代表磁盘中实际存在的文件和目录。
length() 方法用于返回字符串的长度。长度等于字符串中 16 位 Unicode 代码单元的数量。
语法：
public int length()
更多java知识请关注java基础教程。
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