How to extract numbers or alphabets from a String in Java?

#Java #SimpleProgrammingApproach

[sriharibabunidamanuri]

Simple and very helpful
System.out.println(input.replaceAll("[0-9]", ""));
System.out.println(input.replaceAll("[^0-9]", ""));

[f.a]

i have issue with extracting the first three elements in arraylist if anyone helps would be appreciated.