How to find the Element with Maximum Number of Occurrences in a List in Java

How to find the Element with Maximum Number of Occurrences in a List in Java ?

Answer

To find the element with the maximum number of occurrences in a list in Java, you can use a HashMap to count occurrences and iterate through the list.

✐ Examples

1 Find Element with Maximum Occurrences

In this example,

We create a list named list containing elements.
We create a HashMap named countMap to store element occurrences.
We iterate through the list, updating the count in countMap for each element.
We find the element with maximum occurrences by iterating through countMap.
Finally, we print the element with maximum occurrences.

Java Program

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<String> list = Arrays.asList("a", "b", "c", "a", "b", "a");
        Map<String, Integer> countMap = new HashMap<>();
        for (String element : list) {
            countMap.put(element, countMap.getOrDefault(element, 0) + 1);
        }
        String maxElement = Collections.max(countMap.entrySet(), Map.Entry.comparingByValue()).getKey();
        System.out.println("Element with maximum occurrences: " + maxElement);
    }
}

Output

Element with maximum occurrences: a

2 Find Element with Maximum Occurrences in Integers

In this example,

We create a list named numbers containing integers.
We create a HashMap named countMap to store integer occurrences.
We iterate through the list, updating the count in countMap for each integer.
We find the integer with maximum occurrences by iterating through countMap.
Finally, we print the integer with maximum occurrences.

Java Program

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(1, 2, 3, 2, 1, 1, 3, 1);
        Map<Integer, Integer> countMap = new HashMap<>();
        for (Integer num : numbers) {
            countMap.put(num, countMap.getOrDefault(num, 0) + 1);
        }
        Integer maxNumber = Collections.max(countMap.entrySet(), Map.Entry.comparingByValue()).getKey();
        System.out.println("Number with maximum occurrences: " + maxNumber);
    }
}

Output

Number with maximum occurrences: 1

Summary

In this tutorial, we learned How to find the Element with Maximum Number of Occurrences in a List in Java language with well detailed examples.

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How to find the Element with Maximum Number of Occurrences in a List in Java

How to find the Element with Maximum Number of Occurrences in a List in Java ?

Answer

✐ Examples

1 Find Element with Maximum Occurrences

Java Program

Output

2 Find Element with Maximum Occurrences in Integers

Java Program

Output

Summary

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