How to convert a string totally into upper case?

JAVA Program

public class StringToUpperCaseEmp {
	public static void main(String[] args) {
		String str = "string abc touppercase ";
		String strUpper = str.toUpperCase();
		System.out.println("Original String: " + str);
		System.out.println("String changed to upper case: "+ strUpper);
	}
}

Output

Original String: string abc touppercase 
String changed to upper case: STRING ABC TOUPPERCASE