Arraycopy method does not allocate memory space for target array. target array must have already been created with its memory space allocated. example: system. arraycopy(sourcearray, 0, targetarray, 0, source. length); //differences between passing values of variables of primitive data types and pass arrays.for an argument of a primitive type, the argument’s value is passed.argument of an array type, the value of the argument is a reference to an array; the reference value is passed to the method. or simply pass by sharing. thus, if you change the array in the method, you will see the change outside the method. createarraymethod can generates an array of 100 random lowercase letters