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public String intern()

public class Test {
    public static void main(String args[]) {
        String Str1 = new String("www.tutorialpro.org");
        String Str2 = new String("WWW.tutorialpro.org");

        System.out.print("Canonical Representation: ");
        System.out.println(Str1.intern());

        System.out.print("Canonical Representation: ");
        System.out.println(Str2.intern());
    }
}

Canonical Representation: www.tutorialpro.org
Canonical Representation: WWW.tutorialpro.org