length() is function which is defined for string class whereas length is used only for array.

Both returns an int value.length parameter is used with String array to get the number of elements of array and length()method is used with String Buffer to get the length.

length - keyword , find out the array length

// length() - method , find out the String length

length()is a method that is defined in String class whenever length is a property of array that is defined in JVM. because in java array is dynamic , means array are object and contain memory at runtime.

length is an instance variable of array and it returns the number of elements in that array, while length() is a method of String class. length() method returns the length of the string which is equal to the Unicode code units in that string.

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