Java Program to Convert String to Integer Array

import java.util.Arrays;

public class StrToIntArr {
    
  public static void main(String[] args) {
    
        String s = "1 2 3 4 5";

        // Using Streams to convert the string into an integer array
        int[] arr = Arrays.stream(s.split(" "))
                          .mapToInt(Integer::parseInt)
                          .toArray();

        System.out.println("" + s);
        System.out.println("" + Arrays.toString(arr));
    }
}

// Java Program to Convert String to Integer Array using string.replaceAll() method
import java.io.*;
import java.util.Arrays;

public class GFG {
  
    public static void main(String[] args) {
      
        String s = "[1,2,3,4,5]";

        // calling replaceAll() method and split() method on string
        String[] s1 = s.replaceAll("\\[", "")
                              .replaceAll("]", "")
                              .split(",");

        int[] arr = new int[s1.length];

        // parsing the String argument as a signed decimal
        // integer object and storing that integer into the
        // array
        for (int i = 0; i < s1.length; i++) {
            arr[i] = Integer.valueOf(s1[i]);
        }

        System.out.print("String: " + s);

        System.out.print("\nInteger array: "
                         + Arrays.toString(arr));
    }
}

// Java Program to Convert String to Integer Array using string.split() method
import java.io.*;

public class GFG {
  
    static int[] method(String s) {
        String[] sa = s.split(" ");
        int[] arr = new int[sa.length];

        // parsing the String argument as a signed decimal
        // integer object and storing that integer into the array
        for (int i = 0; i < sa.length; i++) {
            arr[i] = Integer.parseInt(sa[i]);
        }
        return arr;
    }

    public static void main(String[] args)
    {
        // Bufferedreader declaration
        BufferedReader br = new BufferedReader(
            new InputStreamReader(System.in));

        String s = "1 2 3 4 5";
        int i;

        // declaring the variable & calling the method with passing string as an argument
        int[] arr = method(s);

        System.out.print("\nString : " + s);

        System.out.print("\nInteger array : [");
        for (i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }

        System.out.print("]");
    }
}