Java equivalent for Vec and Matx?

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It that means I can replace them with native Java arrays? Like for instance:

Vec2i -> int[2]
Vec6d -> double[6]
Matx31f -> float[3][1]
Matx66d -> double[6][6]

Or it's better to create a generic class for each one, like:

public class Vec<T> {
  private int size;
  private Object[] data;

  public Vec(int size) {
    this.size = size;
    this.data = new Object[size];
  }

  // other methods
}

so Vec2i could be represented like: Vec<Integer> v = new Vec<Integer>(2) ?