9. 2. 17. 轮换指定列表中的元素Rotate elements of a collection

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;


public class RotateCollection {

	public static void main(String[] args) {
		List numbers = new ArrayList();
		for(int i = 0; i < 25; i++){
			numbers.add(i);
		}
		System.out.println(Arrays.toString(numbers.toArray()));
		//toArray()按适当顺序（从第一个到最后一个元素）返回包含此列表中所有元素的数组。 
		//[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]
		
		Collections.rotate(numbers, 10);//rotate根据指定的距离轮换指定列表中的元素。10为距离
		System.out.println(Arrays.toString(numbers.toArray()));
		//[15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
	}

}