What is the difference between length and length() ?

Question

I wanted to know what is the difference between the methods, length and length()

Answer 1

length: It is a final variable and only applicable for array. It represent size of array.

Example:

int[] a=new int[10]; System.out.println(a.length); // 10
System.out.println(a.length()); // compile time error

length(): It is the final method applicable only for String objects. It represents the number of characters present in the String.

Example:

String s="Java"; System.out.println(s.length()); // 4
System.out.println(s.length); // compile time error

Answer 2

length is used in a array

length() is used in string

ex
String[] ar = { "hello" , "world" };

System.out.println(ar.length);/// 2

System.out.println(ar[0].length());
/// prints the lengths of hello