Combine two integer arrays [duplicate]

Question

Is there a way to create a single array out of two? E.g.

int[] array1 = {1,2,3}; int[] array2 = {4,5,6}; int[] array1and2 = array1 + array2; 

Answer 1

You can't add them directly, you have to make a new array and then copy each of the arrays into the new one. System.arraycopy is a method you can use to perform this copy.

int[] array1and2 = new int[array1.length + array2.length]; System.arraycopy(array1, 0, array1and2, 0, array1.length); System.arraycopy(array2, 0, array1and2, array1.length, array2.length); 

This will work regardless of the size of array1 and array2.