Commons Lang, a package of Java utility classes for the classes that are in java.lang s hierarchy, or are considered to be so standard as to justify existence in java.lang.-Commons Lang, a package of Java utility classes for the class

读入一个txt文件，实现对文本对其 左对齐实现了，居中和右对齐还有些问题存在-justify text, left justify

文件比较程序，比较两个文件是否相同(txt文件)，可判断是否有更改-file compare program，it can be used to justify whether the file is changed(mainly for txt file)