Big Data Java Foundation 11th day Job

The second question:public class person {    private string name;         public person () {             }    public person (String name) {         super ();        this.name = name;     }        public string getname () {         return this.name;    }}public  Class dog {    private string name;    public  dog () {            }     Public dog (string name) {        super ();         this.Name = name;    }    public string getname () {         return this.name;    }}import  Java.util.map;import java.util.hashmap;import java.util.map.entry;import java.util.list;import  java.util.arraylist;public class hashdemo {    public static  void main (String[] args)  {        map<person, Dog> hashmap = new hashmap<person,dog> ();         List<Person> list = new ArrayList<Person> ();                 person person_obj =  null;        for (int i=0;i<100;i++) {             person_obj = new person ("Person_name"  + i);             hashmap.put (Person_obj, new dog ("Dog_name"  +  i));             list.add (person_obj);         }                 //keyset        for (Person p :  hashmap.keyset ()) {             System.out.println (P.getname ()  +  "---"  + hashmap.get (P). GetName ());         }                 //EntrySet        for  (entry<person,  Dog> entry : hashmaP.entryset ())  {            system.out.println (Entry.getkey (). GetName ()  +  "---"  + entry.getvalue (). GetName ());         }                 for (person pl : list) {             hashmap.remove (PL);        }         system.out.println ("------------");         System.out.println (Hashmap.size ());     }}

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Big Data Java Foundation 11th day Job