Collections Java Tutorial

public  boolean containsAll(Collection c)
This method takes a Collection as its argument, (not necessarily) a Vector, and reports
if the elements of the collection are a subset of the vector's elements.

import java.util.Vector;
public class MainClass {
  public static void main(String args[]) {
    Vector v = new Vector();
    v.add("A");
    v.add("B");
    Vector v2 = new Vector();
    v2.add("A");
    v2.add("B");
    v2.add("C");
    boolean isContaining = v2.containsAll(v);
    System.out.println(isContaining);
  }
}
true