Question

Write a java method merge that accepts two arrays of integers and returns a new array containing all elements of the first array followed by all elements of the second.

int[] a1 = {12, 34, 56};

int[] a2 = {7, 8, 9, 10};  

int[] a3 = merge(a1, a2);

System.out.println(Arrays.toString(a3));

// [12, 34, 56, 7, 8, 9, 10]

Answer 1

//Main.java
import java.util.Arrays;
public class Main{

  public static int[] merge(int a[], int b[]){
    int c[] = new int[a.length+ b.length];
    int k = 0;
    for(int i = 0;i<a.length;i++){
      c[k++] = a[i];
    }
    for(int i = 0;i<b.length;i++){
      c[k++] = b[i];
    }
    return c;
  }


  public static void main(String[] args){
    int[] a1 = {12, 34, 56};

    int[] a2 = {7, 8, 9, 10};

    int[] a3 = merge(a1, a2);

    System.out.println(Arrays.toString(a3));

// [12, 34, 56, 7, 8, 9, 10]
  }
}

[12, 34, 56, 7, 8, 9, 10]