string touppercase 28 29 method in java

1string s="hello";
2s = Character.toUpperCase(s.charAt(0)) + s.substring(1);
3The output will be: Hello

1"Hello World".toUpperCase()

1public class StringToUppercaseDemo
2{
3   public static void main(String[] args)
4   {
5      String str = "flower brackets";
6      String strUpper = str.toUpperCase();
7      System.out.println(strUpper);
8   }
9}

1String var_name = "Jerry";
2System.out.println(var_name.toUpperCase()); //JERRY