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Copy Objects from One Vector to Another Vector using Java

>> Sunday, October 17, 2010

Copy Elements of One Java Vector to Another Java Vector Example

This java example shows how to copy all elements of one Java Vector object to
another Java Vector object using copy method of Collections class.
    import java.util.Collections;
    import java.util.Vector;
    public class CopyElementsOfVectorToVectorExample {
    public static void main(String[] args) {
    //create first Vector object
    Vector v1 = new Vector();
    //Add elements to Vector
    v1.add("1");
    v1.add("2");
    v1.add("3");
    //create another Vector object
    Vector v2 = new Vector();
    //Add elements to Vector
    v2.add("One");
    v2.add("Two");
    v2.add("Three");
    v2.add("Four");
    v2.add("Five");
    System.out.println("Before copy, Second Vector Contains : " + v2);
    //copy all elements of Vector to another Vector using copy
    //method of Collections class
    Collections.copy(v2,v1);
    System.out.println("After copy, Second Vector Contains : " + v2);
    }
  }

To copy elements of one Java Vector to another use,
static void copy(List dstList, List sourceList) method of Collections class.
This method copies all elements of source list to destination list. After copy
index of the elements in both source and destination lists would be identical.
The destination list must be long enough to hold all copied elements.
If it islonger than that, the rest of the destination list's elments would remain unaffected.

Please note that, If destination Vector object is not long enough to hold all elements of source Vector,it throws IndexOutOfBoundsException.

Output would be


Before copy, Second Vector Contains : [One, Two, Three, Four, Five]

After copy, Second Vector Contains : [1, 2, 3, Four, Five]

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