배열 복사
System.arraycopy (Object src, int srcPos, Object dest, int destPos, int length )
char[] src = {'A','B','C'};
char[] dest = {'0','1','2','3','4'};
char[] result = new char[src.length+dest.length];
System.arraycopy(src, 0, dest, 0, src.length);
System.out.println(result);
ABC