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public String toUpperCase()

or

public String toUpperCase(Locale locale)

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

        System.out.print("Return Value :" );
        System.out.println( Str.toUpperCase() );
    }
}

Return Value :WWW.tutorialpro.org