Password Validation regex in Android

Password and Confirm Password Validation in HTML CSS & JavaScript

SOLVED: In Java, write a class named Password with a String field and a constructor that accepts a String object as its argument and sets the String field. The class should have a method named isValidCount that returns true if the number of 'a', 'b', and 'c' in the String field is at least 4, otherwise returns false.

Java Identifiers (Variables Naming) - GeeksforGeeks