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What are the differences between length and length () in Java?
The length is an instance variable of an array in Java whereas length() is a method of String class.
length
- An array is an object that holds a fixed number of values of the same type.
- The length variable in an array returns the length of an array i.e. a number of elements stored in an array.
- Once arrays are initialized, its length cannot be changed, so the length variable can directly be used to get the length of an array.
- The length variable is used only for an array.
Example
public class ArrayLengthTest {
public static void main(String args[]) {
int array[] = {1, 2, 3, 4, 5, 6, 7};
System.out.println("Length of an array is: " + array.length);
}
}Output
Length of an array is: 7
length()
- The length() method is a static method of String class.
- The length() returns the length of a string object i.e. the number of characters stored in an object.
- String class uses this method because the length of a string can be modified using the various operations on an object.
- The String class internally uses a char[] array that it does not expose to the outside world.
Example
public class StringLengthMethodTest {
public static void main(String args[]) {
String str = "Welcome to Tutorials Point";
System.out.println("Length of String using length() method is: " + str.length());
}
}Output
Length of String using length() method is: 26
Updated on: 30-Jul-2019
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