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Tip of the Day
Language: Java
Expertise: Intermediate
Jun 14, 2006

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Date: 1/31/2018 @ 2 p.m. ET

Using System.arraycopy(.....)

When you need the contents of an array for processing, you no longer have to write loops to copy the required contents from the main to the sub-array. Java has provided an API for this task—the arraycopy method in the System class.
The method takes five arguments:
  1. src: The source array.
  2. srcPosition: The position in the source from where you wish to begin copying.
  3. des: The destination array.
  4. desPosition: The position in the destination array to where the copy should start.
  5. length: The number of elements to be copied.
This method throws a NullPointerException if either of src or des are null.

It also throws an ArrayStoreException in the following cases:

  • If the src is not an array.
  • If the des is not an array.
  • If src and des are arrays of different data types.
MS Sridhar
 
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