Collection类及常用API

Collection类及常用API

Collection—类集工具类，定义了若干用于类集和映射的算法，这些算法被定义为静态方法，具体查看api文档;

a) public static void sort(List<T> liet)

b) public static int binarySearch(List<T> list,T key)

c) public static void reverse(List<?> list)

d) public static void shuffle(List<?> list)

e) public static void swap(List<?> list,int i,int j)

f) public static <T> void fill(List<? super T> list,T obj)

         List<String> nList=new ArrayList<String>();

         nList.add("zhangsan");

         nList.add("lisi");

         nList.add("wangwu");

         nList.add("zhaoliu");

         nList.add("tianqi");

         System.out.println("操作前");

         for(String s:nList){

             System.out.print(s+" ");

         }

         System.out.println();

         System.out.println("交换顺序后");

         Collections.swap(nList,1,2);

         for(String s:nList){

             System.out.print(s+" ");

         }

         System.out.println();

         System.out.println("自然排序后");

         Collections.sort(nList);

         for(String s:nList){

             System.out.print(s+" ");

         }

         System.out.println();

         System.out.println("二分法查找");

         System.out.println(Collections.binarySearch(nList, "zhaoliu"));

         System.out.println("打乱顺序");

         Collections.shuffle(nList);

         for(String s:nList){

             System.out.print(s+" ");

         }

         System.out.println();

         System.out.println("填充");

         Collections.fill(nList, "jay");

         for(String s:nList){

             System.out.print(s+" ");

         }

输出结果：

操作前

zhangsan lisi wangwu zhaoliu tianqi

交换顺序后

zhangsan wangwu lisi zhaoliu tianqi

自然排序后

lisi tianqi wangwu zhangsan zhaoliu

二分法查找

打乱顺序

zhaoliu tianqi wangwu zhangsan lisi

填充

jay jay jay jay jay

巴特西

Collection类及常用API

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