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Using System.arraycopy(…..)

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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.

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