package lianxi3;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Set;import org.junit.Test;public class TestGeneric {@Test  //在集合中使用泛型   public void test1(){      List<String> list = new ArrayList<String>();      list.add("f");      list.add("sfd");      list.add("bb");      list.add(new String("sf"));      list.add(new String("ga"));      Iterator<String> ite = list.iterator();      while(ite.hasNext()){          System.out.println(ite.next());      }}@Test  //在Map中使用泛型public void test2(){    Map<Integer,String> map = new HashMap<Integer,String>();    map.put(33, "safd");    map.put(23, "sasdf");    map.put(45, "ssd");    map.put(90, "vfd");    Set<Map.Entry<Integer,String>> set = map.entrySet();    for(Map.Entry<Integer,String> o:set){        System.out.println(o.getKey()+"---->"+o.getValue());    }}}