Java implementation of the method of counting the number of characters and substrings in a string

This paper describes the method of Java to count the number of characters and substrings in a string. Share with you for your reference, as follows:

Here, Java is used to count the number of characters (including numbers, uppercase letters, lowercase letters and other characters) in the string and the number of substrings of the string.

The operation effect diagram is as follows:

The specific codes are as follows:

PS: here are some online character statistics tools for your reference:

Online word count tool: http://tools.jb51.net/code/zishutongji

Online character statistics and editing tools: http://tools.jb51.net/code/char_tongji