Java – Count the number of items in a List
By | Last updated: December 20, 2018
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Tags:count | java | list
In Java, we can use List.size() to count the number of items in a List
package com.mkyong.example; import java.util.Arrays; import java.util.List; public class JavaExample { public static void main(String[] args) { List<String> list = Arrays.asList("a", "b", "c"); System.out.println(list.size()); } }Output
31. Using a Set
We know that set stores only distinct entries. The idea is to get distinct elements in the list by inserting all elements in the set & then call static method frequency(Collection<?> c, Object o) provided by the Collections class for each distinct element. frequency() returns the total number of occurrences of the specified element in the list.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | import java.util.*; // Program to count the frequency of the elements in a list class Main { public static void main(String[] args) { List<String> list = Arrays.asList("B", "A", "A", "C", "B", "A"); Set<String> distinct = new HashSet<>(list); for (String s: distinct) { System.out.println(s + ": " + Collections.frequency(list, s)); } } } |
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Output:
A: 3
B: 2
C: 1
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how to count the number of occurrences of an element in a arraylist in java
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How to Count Number of Elements in a List in Java
June 8, 2021October 12, 2021 0 Comments count number of elements in arraylist java, how to count number of elements in a list in java
In this tutorial, we are going to see how to count the number of elements in a list in Java. In Java, we can use the List.size() method to count the number of elements in a list.
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1. Stream count() API
The Stream interface has a default method called count() that returns a long value indicating the number of matching items in the stream.
long count()To use the count() method, call it on any Stream instance.
Stream s = ...; s.count(); //or s.collect(Collectors.counting());2. Counting Matches in Stream
Example 1: Java program to count the total number of items
In this example, we are counting the number of elements in different kinds of stream such as IntStream, LongStream.
long count = Stream.of("how","to","do","in","java").count(); //5 long count = IntStream.of(1,2,3,4,5,6,7,8,9).count(); //9Example 2: Counting number of matching items in Stream
To count the matching items, we need to apply a filter expression or predicate to filter that will find the matching items and then we can use count() API to count the items.
In given example, we are counting all the even numbers in the stream.
long count = LongStream.of(1,2,3,4,5,6,7,8,9) .filter(i -> i%2 == 0) .count(); //or //.collect(Collectors.counting())Happy Learning !!
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