Adding Another Collection

For adding a collection we use addAll(collection) method.

import java.util.Vector;

public class MainClass {
public static void main(String args[]) {
Vector v = new Vector(5);
for (int i = 0; i < 10; i++) {
v.insertElementAt(i,0);
}
System.out.println(v);

Vector v2 = new Vector();
v2.addAll(v);
v2.addAll(v);

System.out.println(v2);
}
}

o/p:

[9, 8, 7, 6, 5, 4, 3, 2, 1, 0] [9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]

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