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Write a Java program to print the unique elements along with their frequency in thegiven (4 x 4) integer and character matrices.Ex:Output:Element Frequency0 11 32 28 110 2

Question

Write a Java program to print the unique elements along with their frequency in thegiven (4 x 4) integer and character matrices.Ex:Output:Element Frequency0 11 32 28 110 2

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Solution

Here is a simple Java program that prints the unique elements along with their frequency in a given 4x4 integer matrix. This program uses a HashMap to store the elements and their frequencies.

import java.util.HashMap;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        int[][] matrix = {
            {0, 1, 2, 8},
            {1, 0, 2, 10},
            {1, 2, 0, 10},
            {2, 1, 0, 8}
        };

        Map<Integer, Integer> frequencyMap = new HashMap<>();

        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 4; j++) {
                int key = matrix[i][j];
                if (frequencyMap.containsKey(key)) {
                    frequencyMap.put(key, frequencyMap.get(key) + 1);
                } else {
                    frequencyMap.put(key, 1);
                }
            }
        }

        for (Map.Entry<Integer, Integer> entry : frequencyMap.entrySet()) {
            System.out.println("Element: " + entry.getKey() + ", Frequency: " + entry.getValue());
        }
    }
}

This program first initializes a 4x4 matrix with some values. Then it creates an empty HashMap. It then iterates over the matrix, and for each element, it checks if it is already in the HashMap. If it is, it increments the frequency of that element by 1. If it is not, it adds the element to the HashMap with a frequency of 1. Finally, it prints out each element and its frequency.

You can modify this program to work with a character matrix by changing the type of the matrix and the HashMap from int to char.

This problem has been solved

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