Java Vector
Vector is like the dynamic array which can grow or shrink its size. Unlike
array, we can store n-number of elements in it as there is no size limit. It
is a part of Java Collection framework since Java 1.2. It is found in
the java.util package.
Java Vector Example
1. import java.util.*;
2. public class VectorExample {
3. public static void main(String args[]) {
4. //Create a vector
5. Vector<String> vec = new Vector<String>();
6. //Adding elements using add() method of List
7. vec.add("Tiger");
8. vec.add("Lion");
9. vec.add("Dog");
10. vec.add("Elephant");
11. //Adding elements using addElement() method of Vector
12. vec.addElement("Rat");
13. vec.addElement("Cat");
14. vec.addElement("Deer");
15.
16. System.out.println("Elements are: "+vec);
17. }
18. }
Output:
Elements are: [Tiger, Lion, Dog, Elephant, Rat, Cat, Deer]
Java Vector Example 2
1. import java.util.*;
2. public class VectorExample1 {
3. public static void main(String args[]) {
4. //Create an empty vector with initial capacity 4
5. Vector<String> vec = new Vector<String>(4);
6. //Adding elements to a vector
7. vec.add("Tiger");
8. vec.add("Lion");
9. vec.add("Dog");
10. vec.add("Elephant");
11. //Check size and capacity
12. System.out.println("Size is: "+vec.size());
13. System.out.println("Default capacity is: "+vec.capacity());
14. //Display Vector elements
15. System.out.println("Vector element is: "+vec);
16. vec.addElement("Rat");
17. vec.addElement("Cat");
18. vec.addElement("Deer");
19. //Again check size and capacity after two insertions
20. System.out.println("Size after addition: "+vec.size());
21. System.out.println("Capacity after addition is: "+vec.capacity());
22. //Display Vector elements again
23. System.out.println("Elements are: "+vec);
24. //Checking if Tiger is present or not in this vector
25. if(vec.contains("Tiger"))
26. {
27. System.out.println("Tiger is present at the index " +vec.indexOf("Tig
er"));
28. }
29. else
30. {
31. System.out.println("Tiger is not present in the list.");
32. }
33. //Get the first element
34. System.out.println("The first animal of the vector is = "+vec.firstElem
ent());
35. //Get the last element
36. System.out.println("The last animal of the vector is = "+vec.lastElem
ent());
37. }
38. }
Output:
Size is: 4
Default capacity is: 4
Vector element is: [Tiger, Lion, Dog, Elephant]
Size after addition: 7
Capacity after addition is: 8
Elements are: [Tiger, Lion, Dog, Elephant, Rat, Cat, Deer]
Tiger is present at the index 0
The first animal of the vector is = Tiger
The last animal of the vector is = Deer
