length method vs length() method in Java.(Different Type to use length & length() in String & Array in JAVA)

CODING:
class length
{
public static void main(String[] args)
    {
        int i;
        String[] a = { "Programming", "Example", "Of","JAVA" };
        for(i=0;i<a.length;i++){
        System.out.println("Index[" + i +"]=" + a[i]);
          }   
        System.out.println("The size of the array is " + a.length);
        for(i=0;i<a.length;i++){
     
        System.out.println(a[i] + " length is "+ a[i].length());
          }
        String s = "Programming Example Of JAVA";
        System.out.println(s);
        System.out.println("The size of the String is " + s.length());
    }
}