Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Intersection of two arrays in Java
The intersection of the two arrays results in those elements that are contained in both of them. If an element is only in one of the arrays, it is not available in the intersection. An example of this is given as follows −
Array 1 = 1 2 5 8 9 Array 2 = 2 4 5 9 Intersection = 2 5 9
A program that demonstrates the intersection of two sorted arrays in Java is given as follows.
Example
public class Example {
public static void main(String args[]) {
int arr1[] = {2, 4, 6, 8, 9};
int arr2[] = {1, 3, 4, 5, 6, 8, 9};
int m = arr1.length;
int n = arr2.length;
int i = 0, j = 0;
System.out.print("Array 1: ");
for(int k = 0; k < m; k++) {
System.out.print(arr1[k] + " ");
}
System.out.print("
");
System.out.print("Array 2: ");
for(int k = 0; k < n; k++) {
System.out.print(arr2[k] + " ");
}
System.out.print("
");
System.out.print("Intersection of two arrays is: ");
while (i < m && j < n) {
if (arr1[i] < arr2[j])
i++;
else if (arr2[j] < arr1[i])
j++;
else {
System.out.print(arr2[j++]+" ");
i++;
}
}
}
}
The output of the above program is as follows.
Output
Array 1: 2 4 6 8 9 Array 2: 1 3 4 5 6 8 9 Intersection of two arrays is: 4 6 8 9
Now let us understand the above program.
First, the values of the two arrays are printed. The code snippet that demonstrates this is given as follows.
System.out.print("Array 1: ");
for(int k = 0; k < m; k++) {
System.out.print(arr1[k] + " ");
}
System.out.print("
");
System.out.print("Array 2: ");
for(int k = 0; k < n; k++) {
System.out.print(arr2[k] + " ");
}
Then the intersection of the two arrays i.e. their common elements are displayed using a while loop. The code snippet that demonstrates this is given as follows.
System.out.print("Intersection of two arrays is: ");
while (i < m && j < n) {
if (arr1[i] < arr2[j])
i++;
else if (arr2[j] < arr1[i])
j++;
else {
System.out.print(arr2[j++]+" ");
i++;
}
}
Updated on: 30-Jul-2019
2K+ Views
Advertisements