Adding method to a Vector issue

Question

I want to add randomly generated numbers to an vector with size that is determined by the user(xdata, ydata) by using my addInt method, it generates the required numbers in my debugging, but it only returns 0, 0, .. when I print it out

  System.out.println("Input the size of first array");
  int[] xdata = new int[sc.nextInt()];
  System.out.println("Input the size of second array");
  int[] ydata = new int[sc.nextInt()];

  /* this code got my desired results but I want to use a single method
  for(int i=0; i<xdata.length; i++)
     xdata[i]= (int)(Math.random() * 100);
  for(int i=0; i<ydata.length; i++)
     ydata[i]= (int)(Math.random() * 100);
     */

  IntVector x = new IntVector(xdata); //intVector is my class and contructor
  IntVector y = new IntVector(ydata); //I had to make for this

  x.addInt(xdata);
  y.addInt(ydata);

  System.out.println(x.toString()+"\nsorted: ");
  System.out.println(y.toString());



  ////*****my adding method********////
public class IntVector{
//vector constructor//
  public int[] addInt (int[] data){
  if (data.length == n) {  //n meaning my capacity
     IntVector tmp[] = new IntVector[n+10000]; 

     for(int i=0; i<data.length; i++)
        data[i]= (int)(Math.random() * 100);

    } return  data; 
      //all data[i] have randomly generated numbers
      //but it only prints out 0 for each value after.
   }                
 }