collection.java

import java.io.*;
public class Collection
{
   int arr[];
   int len;
   Collection(){
      arr=null;
      len=0;
    }
    Collection(int l){
        len=l;
        arr=new int [len];
    }
    void readArray() throws IOException{
        BufferedReader br=new BufferedReader (new InputStreamReader (System.in));   
        System.out.println("Enter elements for array");
        for (int i=0;i<len;i++){
            arr[i]=Integer.parseInt(br.readLine());
        }
    }
    Collection common (Collection B){
       Collection C=new Collection (len);
       int pos=0;
       for (int i=0;i<this.len;i++){
           for (int j=0;j<B.len;j++){
               if (this.arr[i]==B.arr[j]){
                   C.arr[pos]=arr[i];
                   pos++;
                }
            }
        }
        return C;
    }
    void displayArray(){
        System.out.println("The common array is ");
        for (int i=0;i<len;i++){
            if (arr[i]!=0){
            System.out.println(arr[i]);
        }
        }
    }
    public static void main (String args[]) throws IOException{
        BufferedReader br=new BufferedReader (new InputStreamReader (System.in));
        System.out.println("Enter array size");
        int length =Integer.parseInt (br.readLine());
        Collection P=new Collection (length);
        Collection Q=new Collection (length);
        P.readArray();
        Q.readArray();
        Collection R=P.common(Q);
        R.displayArray();
    }
  }




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