Java get subarray - Java Program to Find a Subarray of an Array Between Specified Indexes

Java get subarray: In the previous article we have discussed about Java Program to Print all SubArrays of a Given Array

In this article we are going to see how we can find subarray of an array between specified index by using Java programming language.

Java Program to Find a Subarray of an Array Between Specified Indexes

Java subarray: Let’s see different ways to find subarray of an array between specified index.

By Using Arrays.copyOfRange() Method
By Using Java Stream API

Method-1: Java Program to Find a Subarray of an Array Between Specified Indexes By Using Arrays.copyOfRange() Method

Approach:

Take the array elements as input from the user.
Store the elements in an array.
Print the array to the user.
Ask the user to enter the beginning and ending index and store the elements.
Create another array and store the elements formed using the copyOfRange() library function.
Print the subarray.

Program:

import java.util.*;
public class Main
{
    public static void main(String[] args) 
    {
        // Scanner to take Input
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter array elements");
        // Takes the input as a single string separated by space 
        // and then splits it into elements of array
        String s = sc.nextLine();
        String str[] = s.split(" ");
        // Prints the array elements
        System.out.println("Array-"+Arrays.toString(str));
        // Asks the user to enter the start and end index of the subarray
        System.out.println("Enter the beginning and ending index-");
        int start = sc.nextInt(), end = sc.nextInt();
        // Stores the subarray formed using the copy range library fucntion
        String[] subArr = Arrays.copyOfRange(str,start,end+1);
        System.out.println("SubArray-"+Arrays.toString(subArr));
    }
}

Output:

Enter array elements
a b c d e f 
Array-[a, b, c, d, e, f]
Enter the beginning and ending index-
2
4
SubArray-[c, d, e]

Method-2: Java Program to Find a Subarray of an Array Between Specified Indexes By Using Java Stream API

Approach:

Take the array elements as input from the user.
Store the elements in an array.
Print the array to the user.
Ask the user to enter the beginning and ending index and store the elements.
Create another array and store the elements formed from the stream function.
Print the subarray.

Program:

import java.util.*;
import java.util.stream.IntStream;
public class Main
{
    public static void main(String[] args) 
    {
        // Scanner to take Input
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter array elements");
        // Takes the input as a single line and then splits it into elements
        String s = sc.nextLine();
        String str[] = s.split(" ");
        // Prints the array elements
        System.out.println("Array-"+Arrays.toString(str));
        // Asks the user to enter the start and end index of the subarray
        System.out.print("Enter the beginning and ending index-");
        int start = sc.nextInt(), end = sc.nextInt();
        // Stores the subarray formed using the JAVA stream API
        String[] subArr = IntStream.range(start, end + 1)
                                .mapToObj(i -> str[i])
                                .toArray(String[]::new);
        System.out.println("SubArray-"+Arrays.toString(subArr));
    }
}

Output:

Enter array elements
ab bc cd ef gh ij kl mn
Array-[ab, bc, cd, ef, gh, ij, kl, mn]
Enter the beginning and ending index-3 5
SubArray-[ef, gh, ij]

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