128

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(); } }