What is the difference between length and length() in java?

length: Length is a variable in java which is used to find the length of the array. Example:

int[] a = new int[6];
int l = a.length;     // l = 6

length(): It is a final method of String class which is used to find the length of the string. Example:

String s = "Vinay";
int l = s.length(); //l=5;