128_容器_工具类Collections方法详解_洗牌

• TestCollections.java

package collection.sort.collections_detail;import java.util.ArrayList;import java.util.Collections;import java.util.List;/** *1、 binarySearch(List<? extends Comparable<? super T>> list, T key) 容器有序 *2、sort(List<T> list)     sort(List<T> list, Comparator<? super T> c)  *3、reverse(List<?> list)   4、shuffle(List<?> list) 洗牌  5、swap(List<?> list, int i, int j)  */public class TestCollections {    //反转    public static void test1(){        List<Integer> list =new ArrayList<Integer>();        list.add(1);        list.add(2);        list.add(3);        list.add(4);        System.out.println(list);        Collections.reverse(list);        System.out.println("反转之后"+list);    }    public static void main(String[] args) {        List<Integer> cards =new ArrayList<Integer>();        //shuffle 洗牌 模拟斗地主        for(int i=0;i<54;i++){            cards.add(i);         }        //洗牌        Collections.shuffle(cards) ;        //依次发牌        List<Integer> p1 =new ArrayList<Integer>();        List<Integer> p2 =new ArrayList<Integer>();             List<Integer> p3 =new ArrayList<Integer>();        List<Integer> last =new ArrayList<Integer>();        for(int i=0;i<51;i+=3){            p1.add(cards.get(i));            p2.add(cards.get(i+1));            p3.add(cards.get(i+2));        }        //最后三张为底牌        last.add(cards.get(51));        last.add(cards.get(52));        last.add(cards.get(53));        System.out.println("第一个人:"+p1);        System.out.println("第二个人:"+p2);        System.out.println("第三个人:"+p3);        System.out.println("底牌为:"+last);        System.out.println("===========================");        test1();    }   }