Java string not converted to lower case [duplicate]

Question

Why does the string s print "Hello, World" after converting to lower case?

public class Practice {
    public static void main(String[] args){
        String s = "Hello, World";
        s.toLowerCase();
        System.out.println(s);
    }
}

Answer 1

Strings are immutable. You need to re assign the result of String#toLowerCase to the variable:

s = s.toLowerCase();