uppercase java

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

1"Hello World".toUpperCase()

1public class Guru99 {   
2    public static void main(String args[]) {       
3        String S1 = new String("minúsculas convertidas en mayúsculas");       
4 
5        // Convertir a UpperCase    
6        System.out.println(S1.toUpperCase());   
7    }
8}
9

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