Map泛型集合-显示企鹅信息

 package collection;

 /**
  * 宠物类
  * @author
  *
  */
 public class Pet {
     private String name;
     private String sex;

     public Pet() {
     }

     public Pet(String name, String sex) {
         this.name = name;
         this.sex = sex;
     }

     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getSex() {
         return sex;
     }
     public void setSex(String sex) {
         this.sex = sex;
     }

 }

 package collection;

 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;

 public class test4 {

     public static void main(String[] args) {
         Map<String,String> p=new HashMap<String,String>();
         p.put("欧欧","Q仔");
         p.put("亚亚","Q妹");
         p.put("菲菲","Q妹");
         p.put("美美","Q妹");

         System.out.println("使用Iteror遍历，所有企鹅的昵称和品种是：");
         Set<String> keys=p.keySet();
         //使用Iterator迭代器拿到每个key
         Iterator<String> itor=keys.iterator();
         while(itor.hasNext()) {
             String key=itor.next();
             String value=p.get(key);  //根据key拿到value
             System.out.println(key+"\t"+value);
         }

         System.out.println("使用foreach语句遍历，所有企鹅的昵称和品种分别是：");
         for (String key : keys) {
             String value=p.get(key);
             System.out.println(key+"\t"+value);
         }
     }

 }