Unlimited number of array elements, help please!

Question

Hi everyone,
I have written this code for comparing two arrays but i don't know how to accept all types array lengths. Now i am limited to 5 elements and i want it to accept the the users desired number of elements. How should i do?
import java.util.*;
class console
public static void main (String[] args)
ConsoleInput ci = new ConsoleInput();
          System.out.print("Hur m�nga Vektorer ska lagras? ");
          int antal = ci.readInt();
          if (antal<2)
         System.out.println("Du beh�ver 2 st vektorer");
         System.out.println("Hur m�nga element per vektor?");
         int antalelement = ci.readInt();
          System.out.println();
               for (int j=0 ; j<antal-1; j++)
               System.out.print("Ange vektor1: ");
               int vektor = ci.readInt();
               int vektor3 = ci.readInt();
               int vektor2 = ci.readInt();
               int vektor4 = ci.readInt();
               int vektor5 = ci.readInt();
               int[] vektor1 = new int[] {vektor,vektor3, vektor2, vektor4, vektor5};
              int langd = vektor1.length;
              System.out.print("Ange vektor2: ");
               int element1 = ci.readInt();
               int element2 = ci.readInt();
               int element3 = ci.readInt();
               int element4 = ci.readInt();
               int element5 = ci.readInt();
               int[] vektor21 = new int[] {element1,element2,element3, element4, element5};
               Arrays.sort (vektor21);
                int  kopiera = vektor1.length + vektor21.length;
                         int[] nyvektor = new int [kopiera];
                          for(int i = 0; i < vektor1.length; i++)
                               nyvektor[i] = vektor1;
                         for(int i = 0; i < vektor21.length; i++)
                              nyvektor[vektor1.length + i] = vektor21[i];
          System.out.print("Unionen ar: ");
                              verktyg.sort(nyvektor);
                              int counter = 0;
                              for(int k = 1; k < nyvektor.length; k++)
                              if(nyvektor[k] == nyvektor[k-1])
                              counter++;
                              int[] union = new int[nyvektor.length - counter];
                              union[0] = nyvektor[0];
                              int b = 1;
                              for(int k = 1; k < nyvektor.length; k++)
                              if(nyvektor[k] != nyvektor[k-1])
                                                       union[b] = nyvektor[k];
                                                       b++;
                                                       for (int h = 0; h<union.length; h++)
                                                       System.out.print(" " +union[h]);
System.out.println();
System.out.print("Intersection ar: ");
Arrays.sort(nyvektor);
               int counter1= 0;
          for(int i = 1; i < nyvektor.length; i++)
          if(nyvektor[i] == nyvektor[i-1])
          counter1++;
               int[] intersection = new int[counter1];
          //c[0] = C[0];
          int a = 0;
          for(int i = 1; i < nyvektor.length; i++)
          if(nyvektor[i] == nyvektor[i-1])
                                   intersection[a] = nyvektor[i];
                                   a++;
                    for(int i=0; i<intersection.length; i++)
                                   System.out.print(" " +intersection[i]);
System.out.println();
System.out.println("Differensen ar: ");
Arrays.sort(nyvektor);
     int counter2 = 0;
                    for(int i = 1; i < nyvektor.length; i++)
                    if(nyvektor[i] == nyvektor[i-1])
                    counter2++;
                         int[] difference = new int[vektor1.length-counter];
                                             boolean falsk = false;
                                             int k=0;
                                             for(int i = 0; i < vektor1.length; i++)
                                                  for(int d=0; d<vektor21.length; d++)
                                                            if(vektor1[i]!=vektor21[d])
                                                                 falsk = true;
                                                            else
                                                                 falsk = false;
                                                                 break;
                                                            if(falsk)
                                                                 difference[k] = vektor1[i];
                                                                 k++;
                                        for(int i=0; i<difference.length; i++)
                              System.out.print(difference[i] + " ");

Answer 1

How about this?import java.util.*;
import java.io.*;
class DynamicVectors
  public static void main (String[] args)
    BufferedReader console
      = new BufferedReader (new InputStreamReader (System.in));
    String consoleLine = "";
    StringTokenizer tokenizer;
    System.out.print ("Hur m�nga Vektorer ska lagras? ");
    try
      consoleLine = console.readLine();
    catch (IOException ioe)
      System.out.println (ioe);
    tokenizer = new StringTokenizer (consoleLine);
    int antal = Integer.parseInt (tokenizer.nextToken());
    if (antal<2)
      System.out.println("Du beh�ver 2 st vektorer");
    for (int j=0 ; j<antal-1; j++)
      int vektorSize;
      System.out.print("Ange vektor1: ");
      try
        consoleLine = console.readLine();
      catch (IOException ioe)
        System.out.println (ioe);
      // Here's where the fun starts...
      tokenizer = new StringTokenizer (consoleLine);
      vektorSize = tokenizer.countTokens();
      int[] vektor1 = new int [vektorSize];
      for (int i = 0; i < vektor1.length; ++i)
        vektor1 = Integer.parseInt (tokenizer.nextToken());
// ...and that's all there is to it.
int langd = vektor1.length;
System.out.print("Ange vektor2: ");
try
consoleLine = console.readLine();
catch (IOException ioe)
System.out.println (ioe);
// Here's where the fun starts...
tokenizer = new StringTokenizer (consoleLine);
vektorSize = tokenizer.countTokens();
int[] vektor21 = new int [vektorSize];
for (int i = 0; i < vektor21.length; ++i)
vektor21 [i] = Integer.parseInt (tokenizer.nextToken());
Arrays.sort (vektor21);