How to Split a List in Java

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How to Split a List in Java ?

Answer

To split a list in Java, you can use the subList method of the List interface or manually create chunks.

✐ Examples

1 Split a List Using subList

In this example,

We create a list named numbers with initial integer values.
We use the subList method to create a sublist from the original list, specifying the start and end indices.
The subList method returns a view of the specified range within the original list.
Finally, we print the sublist to standard output.

Java Program

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        List<Integer> numbers = new ArrayList<>();
        for (int i = 1; i <= 6; i++) {
            numbers.add(i);
        }
        List<Integer> sublist = numbers.subList(2, 5);
        System.out.println("Sublist: " + sublist);
    }
}

Output

Sublist: [3, 4, 5]

2 Split a List into Chunks

In this example,

We create a list named numbers with initial integer values.
We create a method named splitList that takes a list and a chunk size as parameters.
Within the splitList method, we use a for loop to iterate over the list and create sublists of the specified chunk size.
The method returns a list of sublists, where each sublist contains a chunk of the original list.
Finally, we print the list of chunks to standard output.

Java Program

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        List<Integer> numbers = new ArrayList<>();
        for (int i = 1; i <= 8; i++) {
            numbers.add(i);
        }
        List<List<Integer>> chunks = splitList(numbers, 3);
        System.out.println("Chunks: " + chunks);
    }

    public static List<List<Integer>> splitList(List<Integer> list, int chunkSize) {
        List<List<Integer>> chunks = new ArrayList<>();
        for (int i = 0; i < list.size(); i += chunkSize) {
            int end = Math.min(list.size(), i + chunkSize);
            chunks.add(new ArrayList<>(list.subList(i, end)));
        }
        return chunks;
    }
}

Output

Chunks: [[1, 2, 3], [4, 5, 6], [7, 8]]

Summary

In this tutorial, we learned How to Split a List in Java language with well detailed examples.

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How to Split a List in Java

How to Split a List in Java ?

Answer

✐ Examples

1 Split a List Using subList

Java Program

Output

2 Split a List into Chunks

Java Program

Output

Summary

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