java System.arraycopy 数组复制和合并

public class Test {

    public static void main(String[] args)  {

         Integer[] a = {1,2,3};

         Integer[] b = {4,5,6};

         Integer[] c = new Integer[a.length+b.length];

         System.arraycopy(a, 0, c, 0, a.length);

         System.arraycopy(b, 0, c, b.length, b.length);

         for(Integer i : c){

             System.out.println(i);

         }

    }

}