To change the case of string to upper case: public String toUpperCase() method of String class.

    

public class Main {

  public static void main(String[] args) {
    String str = "string";
    String strUpper = str.toUpperCase();
    System.out.println(str);
    System.out.println(strUpper);
  }
}
/*
string
STRING
*/

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To change the case of string to upper case: public String toUpperCase() method of String class. : String Convert « Data Type « Java

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