String Methods for Character Extraction in Java

Java Tutorial String Methods in Java

String Searching Methods in Java

Java - Create a String with the contents of a character array

[Hackerrank] - Making Anagrams Solution – Study Algorithms

Remove minimum characters so that two strings become anagram - GeeksforGeeks

Java String concat() Method with Examples - GeeksforGeeks

Java - Concatenate a string to the end of another string

String Concatenation