public class IntVectorTest
{
  public static void main( String[] args)
  {
    // Declaring arrays for IntVectors
    int[] array1 = { 1, 2, 3, 4};
    int[] array2 = { 5, 6, 7, 8, 9, 10};

    // Declaring new IntVectors
    IntVector vector1 = new IntVector( array1);
    IntVector vector2 = new IntVector( array2);

    // Print new IntVectors.
    System.out.println( "Vector 1: " + vector1);
    System.out.println( "Vector 2: " + vector2);
    System.out.println();

    // Add vector2 to vector1 and print IntVectors again.
    vector1.add( vector2);
    System.out.println( "Vector 1: " + vector1);
    System.out.println( "Vector 2: " + vector2);
    System.out.println();

    // Create two new IntVectors by using = operator and clone method. Then add a new element to vector2 to see the difference.
    IntVector vector3 = vector2;
    IntVector vector4 = vector2.clone();
    vector2.addElement( 11);

    // Print these vectors
    System.out.println( "Vector 2: " + vector2);
    System.out.println( "Vector 3 (=): " + vector3); // Therefore we have created vector3 by using = operator, it refers to the same object with vector2.
    System.out.println( "Vector 4 (clone):" + vector4); // Therefore we have created vector4 by using clone method, it's a new object and it has an independent array from vector2.
    System.out.println();

    // Declare a new IntVector with a null array
    IntVector vector5 = new IntVector();

    // Try to print that IntVector
    System.out.println( "Vector 5: " + vector5); // Therefore, we've checked if array is null in our IntVector class methods. This line won't give any errors.

    // Try to add a new element and print
    vector5.addElement( 100); // Null check in class method again. Otherwise it will give an error.
    System.out.println( "Vector 5: " + vector5);
  }
}