- Java.util Package Classes
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- Java.util - Vector
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- Java.util Package Extras
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- Java.util - Enumerations
- Java.util Useful Resources
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- Java.util - Discussion
Java Vector capacity() Method
Description
The Java Vector capacity() method is used to return the current capacity of a vector.Capacity is the length of the array kept in the vactor.
Declaration
Following is the declaration for java.util.Vector.capacity() method
public int capacity()
Parameters
This method does not take any parameter as input.
Return Value
The method returns the current capacity of the vector as an integer value.Here capacity means the length of its internal data array, kept in the field elementData of this vector.
Exception
NA
Getting Capacity of a Vector of Integer Example
The following example shows the usage of Java Vector capacity() method to get the capacity of the vector. We're adding couple of Integers to the Vector object using add() method calls per element and then print the vector capacity.
package com.tutorialspoint; import java.util.Vector; public class VectorDemo { public static void main(String[] args) { // create an empty array list Vector<Integer> vector = new Vector<>(); // use add() method to add elements in the vector vector.add(20); vector.add(30); vector.add(20); vector.add(30); vector.add(15); vector.add(22); vector.add(11); System.out.println("Vector capacity: " + vector.capacity()); } }
Output
Let us compile and run the above program, this will produce the following result −
Vector capacity: 10
Getting Capacity of a Vector of String Example
The following example shows the usage of Java Vector capacity() method to get the capacity of the vector. We're adding couple of Strings to the Vector object using add() method calls per element and then print the vector capacity.
package com.tutorialspoint; import java.util.Vector; public class VectorDemo { public static void main(String[] args) { // create an empty array list Vector<String> vector = new Vector<>(); // use add() method to add elements in the vector vector.add("Welcome"); vector.add("To"); vector.add("Tutorialspoint"); System.out.println("Vector capacity: " + vector.capacity()); } }
Output
Let us compile and run the above program, this will produce the following result −
Vector capacity: 10
Getting Capacity of a Vector of an Object Example
The following example shows the usage of Java Vector capacity() method to get the capacity of the vector. We're adding couple of Student objects to the Vector object using add() method calls per element and then print the vector capacity.
package com.tutorialspoint; import java.util.Vector; public class VectorDemo { public static void main(String[] args) { // create an empty vector Vector<Student> vector = new Vector<>(); // use add() method to add elements in the vector vector.add(new Student(1, "Julie")); vector.add(new Student(2, "Robert")); vector.add(new Student(3, "Adam")); System.out.println("Vector capacity: " + vector.capacity()); } } class Student { int rollNo; String name; Student(int rollNo, String name){ this.rollNo = rollNo; this.name = name; } @Override public String toString() { return "[ " + this.rollNo + ", " + this.name + " ]"; } }
Output
Let us compile and run the above program, this will produce the following result −
Vector capacity: 10