Question

/**
* 1. Write the method plusTwo().
*
* Your method will take 2 int arrays as parameters.
* Each will have a length of 2. Your method must
* create and return a new array with a length of 4,
* containing all their elements.
*
* Here are some examples:
* plusTwo({1, 2}, {3, 4}) returns {1, 2, 3, 4}
* plusTwo({4, 4}, {2, 2}) returns {4, 4, 2, 2}
* plusTwo({9, 2}, {3, 4}) returns {9, 2, 3, 4}
*
* @param a an array of int, length 2.
* @param b an array of int, length 2.
* @return an array of int as described above.
*/
// WRITE THE METHOD plusTwo() HERE

Answer 1

import java.util.Arrays;

//TestCode.java
public class TestCode {
    public static int[] plusTwo(int arr[][]){
        int result[] = new int[4];
        result[0] = arr[0][0];
        result[1] = arr[0][1];
        result[2] = arr[1][0];
        result[3] = arr[1][1];
        return result;
    }

    public static void main(String[] args) {
        int arr[][] = {{1, 2}, {3, 4}};
        System.out.println(Arrays.toString(plusTwo(arr)));
    }
}

[1, 2, 3, 4]

public static int[] plusTwo(int arr[][]){
    int result[] = new int[4];
    result[0] = arr[0][0];
    result[1] = arr[0][1];
    result[2] = arr[1][0];
    result[3] = arr[1][1];
    return result;
}