Java案例：泛型参数的方法

      package net.hw.collection;
      import java.util.*;
      /**
       * Created by howard on 2018/2/2.
       */
      public class FindElementInCollection {
         public static void main(String[] args) {
              List<String> names = new ArrayList<>();
              names.add("mike");
              names.add("howard");
              names.add("smith");
              names.add("alice");
              names.add("brown");
              names.add("green");
             String name = "alice";
             if (contains(names, name)) {
                  System.out.println(name + " is in " + names);
              } else {
                  System.out.println(name + " is not in " + names);
              }
             ///
              Set<Integer> nums = new HashSet<>();
             for (int i = 0; i < 10; i++) {
                  nums.add(new Random().nextInt(100));
              }
             Integer num = 25;
             if (contains(nums, num)) {
                  System.out.println(num + " is in " + nums);
              } else {
                  System.out.println(num + " is not in " + nums);
              }
          }
         /**
       * 查看任意集合是否包含指定元素泛型方法
       */
         public static <E> boolean contains(Collection<E> c, Object obj) {
             for (E element : c) {
                 if (element.equals(obj)) {
                     return true;
                  }
              }
             return false;
          }
      }
  
 

文章来源: howard2005.blog.csdn.net，作者：howard2005，版权归原作者所有，如需转载，请联系作者。

原文链接：howard2005.blog.csdn.net/article/details/79335753