﻿ Java - Find common elements from three sorted arrays

# Java: Find common elements from three sorted arrays

## Java Array: Exercise-25 with Solution

Write a Java program to find common elements in three sorted (in non-decreasing order) arrays.

Pictorial Presentation: Sample Solution:

Java Code:

``````// Import the java.util package to use utility classes, including ArrayList.
import java.util.*;

// Define a class named Exercise25.
public class Exercise25 {
// The main method for executing the program.
public static void main(String[] args) {
// Create an ArrayList to store common elements.
ArrayList common = new ArrayList();

// Declare three arrays of integers.
int array1[] = {2, 4, 8};
int array2[] = {2, 3, 4, 8, 10, 16};
int array3[] = {4, 8, 14, 40};

// Initialize three index variables for each array.
int x = 0, y = 0, z = 0;

// Use a while loop to compare elements of the three arrays.
while (x < array1.length && y < array2.length && z < array3.length) {
// Check if the elements at the current positions in all arrays are equal.
if (array1[x] == array2[y] && array2[y] == array3[z]) {
// If they are equal, add the element to the 'common' ArrayList and increment all indices.
x++;
y++;
z++;
} else if (array1[x] < array2[y]) {
// If the element in the first array is smaller, increment the index of the first array.
x++;
} else if (array2[y] < array3[z]) {
// If the element in the second array is smaller, increment the index of the second array.
y++;
} else {
// If the element in the third array is smaller, increment the index of the third array.
z++;
}
}

// Print the common elements found in the three sorted arrays.
System.out.println("Common elements from three sorted (in non-decreasing order) arrays: ");
System.out.println(common);
}
}
```
```

Sample Data: array1 = 2, 4, 8
array2 = 2, 3, 4, 8, 10, 16
array3 = 4, 8, 14, 40

Sample Output:

```
Common elements from three sorted (in non-decreasing order ) arrays:
[4, 8]
```

Flowchart: Java Code Editor:

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