arraycopy效率比较

import java.util.Date;


public class TestArrayCopy {
	public static void main(String[] args) {
		

		Date d1 = new Date();
		int[] arr = new int[10000000];
		for(int i = 0; i < 10000000; i++) {
			arr[i] = i;
		}
		Date d2 = new Date();
		
		System.out.println(d2.getTime() - d1.getTime());
		
		
		int[] arr2 = new int[10000000];
		Date d3 = new Date();
		System.arraycopy(arr,0, arr2, 0, 10000000);
		Date d4 = new Date();
		System.out.println(d4.getTime() - d3.getTime());	
	}
}