array.length: length is the last variable that applies to the array. With the help of variable length we can determine the size of the array.
string.length(): The long() method is the last variable that applies to a String object. The long() method returns the number of characters present in the string.
length vs length():
// length can be used for int[], double[], String[] // to know the length of the arrays. // length() can be used for String, StringBuilder, etc // String class related Objects to know the length of the String
3. We can use .length for direct access to array field elements; .Length() calls the method to access the field element.
Example:
// Java program to illustrate the // concept of length // and length() public class Test { public static void main(String[] args) { // Here array is the array name of int type int[] array = new int[4]; System.out.println("The size of the array is " + array.length); // Here str is a string object String str = "GeeksforGeeks"; System.out.println("The size of the String is " + str.length()); } }
Output
The size of the array is 4 The size of the String is 13
Practice Questions based on the concept of length vs length()
Let’s have a look at the output of the following programs:
public class Test { public static void main(String[] args) { // Here str is the array name of String type. String[] str = { "GEEKS", "FOR", "GEEKS" }; System.out.println(str.length); } }
Output
3
Explanation: Here str is an array of type string and therefore str.length is used to specify the length.
public class Test { public static void main(String[] args) { // Here str[0] pointing to a string i.e. GEEKS String[] str = { "GEEKS", "FOR", "GEEKS" }; System.out.println(str.length()); } }
Output:
error: cannot find symbol symbol: method length() location: variable str of type String[]
Explanation: Here the str is an array of type string and that’s why str.length() CANNOT be used to find its length.
public class Test { public static void main(String[] args) { // Here str[0] pointing to String i.e. GEEKS String[] str = { "GEEKS", "FOR", "GEEKS" }; System.out.println(str[0].length()); } }
Output
5
Explanation:
Here str[0] points to a string, i.e. GEEKS and hence can be called via .length()