Java method for counting the number of occurrences of a specified element in a string

This article explains the method of counting the number of occurrences of a string in the text or the number of occurrences of specified elements in the string, which is shared for your reference. The specific contents are as follows

Operation effect diagram:

How many times does the program find the characters with "a" in this file

The specific codes are as follows

The above is the method of counting the number of occurrences of specified elements in Java string. I hope it will be helpful to everyone's learning.

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