Question

How to add a range of elements of a list to another list at a specific position in Java

Answer 1

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

public class InsertRangeExample {
    public static void main(String[] args) {
        List<Integer> source = List.of(10, 20, 30, 40, 50, 60, 70);
        List<Integer> target = new ArrayList<>(List.of(1, 2, 3, 4));

        // Extract elements from index 2 to 4 (30, 40, 50)
        List<Integer> rangeToInsert = source.subList(2, 5);

        // Insert at position 1
        target.addAll(1, rangeToInsert);

        System.out.println(target);  
    }
}



/*
run:

[1, 30, 40, 50, 2, 3, 4]

*/

 

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