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Saturday, February 14, 2015

Java Program to Find Intersection of two Arrays

For example we have two sorted arrays a1[]={2,3,5,11} and a2[]={4,5,7,9,11} then intersection of a1 and a2 will be {5,11}. A Java program for finding intersection of two arrays is given below.

Also Read: Java Program to Find Union of two Arrays

Java Program to Find Intersection of two Arrays

import java.util.Scanner; //import Scanner class in our program

class demo
{
public static void main(String...s)
{
int i,j,n1,n2;
Scanner sc=new Scanner(System.in); //used to read from keyboard

System.out.print("Enter number of elements of first array:");
n1=sc.nextInt();
System.out.print("Enter number of elements of second array:");
n2=sc.nextInt();

int a1[]=new int[n1];
int a2[]=new int[n2];

System.out.print("
Enter elements of first array in ascending order:");
for(i=0;i<n1;++i)
a1[i]=sc.nextInt();

System.out.print("
Enter elements of second array in ascending order:");
for(i=0;i<n2;++i)
a2[i]=sc.nextInt();

i=j=0;
System.out.print("
Intersection of Arrays: ");
while(i<n1&&j<n2)
{
if(a1[i]<a2[j])
i++;
else
if(a2[j]<a1[i])
j++;
else
{
System.out.print(a1[i]+" ");
i++;
j++;
}
}

}
}