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Java vectors

Creating Vectors public Vector() public Vector(int initialCapacity) public Vector(int initialCapacity, int capacityIncrement) The reason for the different constructors is basically performance. 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.add(i);     }     System.out.println(v);   } } [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]