How to convert a string totally into upper case?

Following example changes the case of a string to upper case by using String toUpperCase() method.

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);

The above code sample will produce the following result.

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

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