CODEWITHSUNDEEP
java
Steven84
Steven84

Reputation: 55

Java - Adding two arrays together

How would I go about adding 2 arrays together?

For example if: array 1= [11,33,4] array 2= [1,5,4]

Then the resultant array should be c=[11,33,4,1,5,4]; Any help would beappreciated

Upvotes: 3

Views: 11506

Answers (4)

Jordan.J.D
Jordan.J.D

Reputation: 8113

I would use an arraylist since the size is not permanent. Then use a loop to add your array to it.

http://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html

Upvotes: 0

rolfl
rolfl

Reputation: 17707

Create a third array, copy the two arrays in to it:

int[] result = new int[a.length + b.length];
System.arraycopy(a, 0, result, 0,  a.length);
System.arraycopy(b, 0, result, a.length, b.length);

Upvotes: 7

rgettman
rgettman

Reputation: 178333

Declare the c array with a length equal to the sum of the lengths of the two arrays. Then use System.arraycopy to copy the contents of the original arrays into the new array, being careful to copy them into the destination array at the correct start index.

Upvotes: 0

Daniel Kaplan
Daniel Kaplan

Reputation: 67504

You can do this in Apache Commons Lang. It has a method named addAll. Here's its description:

Adds all the elements of the given arrays into a new array.

The new array contains all of the element of array1 followed by all of the elements array2. When an array is returned, it is always a new array.

Here's how you'd use it:

combinedArray = ArrayUtils.addAll(array1, array2);

Upvotes: 2

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