CODEWITHSUNDEEP
java
efe
efe

Reputation: 39

splitting arrays

How do I partition an array into four sub arrays in Java?

Upvotes: 2

Views: 15043

Answers (4)

diggi
diggi

Reputation: 101

See my answer here:

Split an array in multiple arrays with a specific maximum size

What's the maximum size you have to evaluate by dividing the array length by the number of sub arryas (beware of float results, it must be an Integer).

Upvotes: 1

Tobias Müller
Tobias Müller

Reputation: 371

In addition to what was already said, you could use one of the Arrays.copyOfRange(...) methods available in class java.util.Arrays.

Upvotes: 1

Zyx
Zyx

Reputation: 495

Ordinary partitioning... I would use one of the two ways below:

  1. If you need to move groups of items into separate arrays, for example items 0 to 10 to array 1, 11 to 20 to array 2 etc., I would create four arrays and use System.arraycopy() static method:

    System.arraycopy(sourceArray, sourceStart, destArray, destStart, length);

  2. If you must check, where a particular item should go, create four arrays, four index counter variables and make a loop through the elements of the original array. Test the condition and add it to one of the four arrays, incrementing the appropriate index counter.

Upvotes: 1

Markus Lausberg
Markus Lausberg

Reputation: 12257

Create 2 Array of the length you want to have it.

And use

System.arraycopy(src, srcPos, dest, destPos, length)

to copy the values from the original to the two new target arraies.

Example:

    int[] original = new int [13];
    int[] a = new int[3];
    int[] b = new int[10];

    System.arraycopy(original, 0, a, 0, 3);
    System.arraycopy(original, 3, b, 0, 10);

Upvotes: 11

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