Question

How to count frequency of each element in an array in Java

Answer 1

public class MyClass {
    public static void main(String args[]) {
        int[] array = { 4, 1, 2, 8, 9, 5, 5, 1, 7, 8, 8 };
        int[] frequency = new int[10];
       
        for (int i = 0; i < array.length; i++) {
            frequency[array[i]]++;
        }
      
        for (int i = 0; i < 10; i++) {
            if (frequency[i] != 0)
                System.out.println(i + ": - " + frequency[i] + " times");
        }
    }
}



 
/*
run:
     
1: - 2 times
2: - 1 times
4: - 1 times
5: - 2 times
7: - 1 times
8: - 3 times
9: - 1 times
       
*/

 

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