Merge Arrays()

Step 1: Understanding Problem Statement

In order to merge two arrays in Java, we first need to analyze the problem. The problem states that we need to create a function that merges two arrays into one. The order in which the arrays' elements will be in the final, merged array is not specified in the problem statement.

Step 2: Initialize Output Array

To start, we create an array that will be used for the output. This array's length will be the sum of the lengths of the two input arrays.

int[] mergedArray = new int[array1.length + array2.length];

Step 3: Copy Elements from First Array

Next, we copy all the elements from the first array into the output array using the System.arraycopy method.

System.arraycopy(array1, 0, mergedArray, 0, array1.length);

Step 4: Copy Elements from Second Array

Similarly, all the elements from the second array are to be copied to the output array. Here, the destination position is array1.length, as we want to append the elements at the end of the copied elements of array1.

System.arraycopy(array2, 0, mergedArray, array1.length, array2.length);

Step 5: The Complete Function

When we put it all together, we have a complete function for merging two arrays in Java.

public static int[] mergeArrays(int[] array1, int[] array2) {
    int[] mergedArray = new int[array1.length + array2.length];
    System.arraycopy(array1, 0, mergedArray, 0, array1.length);
    System.arraycopy(array2, 0, mergedArray, array1.length, array2.length);
    return mergedArray;
}

This function merges two arrays by copying all elements from both into a new array. The elements from the first array occupy the initial positions in the merged array, followed by all the elements from the second array.