【Map】Map.Entry的使用

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

public class Test2 {

public static void main(String[] args) {
HashMap<Person,String>hashMap=new HashMap<Person,String>();
hashMap.put(new Person("jingtianxiaozhi1",21),"beijing");
hashMap.put(new Person("jingtianxiaozhi3",23),"qingdao");
hashMap.put(new Person("jingtianxiaozhi2",22),"jinan");
hashMap.put(new Person("jingtianxiaozhi4",24),"nanjing");
Set<Map.Entry<Person, String>> entry=hashMap.entrySet();
Iterator<Map.Entry<Person,String>>iterator=entry.iterator();
while(iterator.hasNext())
{
System.out.println(iterator.next().getKey().getName());
}
}
}
class Person{
private String name;
private int age;

public Person(String name, int age) {
super();
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}

}