Copy array in Java arraycopy ()

System.arraycopy ();//static method, defined in the System class, Note that the copy first letter is lowercase

Example:

Int[] A = {1,2,3,4,5};

Int[] B = {9,8,7,6};

/*arraycopy has 5 parameters, the first is: Copy array, the second is: from which element to start copying;

* The third is: the target array, the fourth is: Copy to the target array in fact subscript; The fifth is: number of copied elements ***/

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

The result:b={1,2,3,7,6}//1,2,3 replaced the original 9,8,7.

Copy array in Java arraycopy ()