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package map;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

public class Demo3 {

public static void main(String[] args) {

HashMap<Person, String> hm = new HashMap<Person, String>();

hm.put(new Person("jack", 20), "1001");

hm.put(new Person("rose", 18), "1002");

hm.put(new Person("lucy", 19), "1003");

hm.put(new Person("hmm", 17), "1004");

hm.put(new Person("ll", 25), "1005");

System.out.println(hm);

System.out.println(hm.put(new Person("rose", 18), "1006"));

Set<Map.Entry<Person, String>> entrySet = hm.entrySet();

Iterator<Map.Entry<Person, String>> it = entrySet.iterator();

while (it.hasNext()) {

Map.Entry<Person, String> next = it.next();

Person key = next.getKey();

String value = next.getValue();

System.out.println(key + " = " + value);

}

}

}

class Person {

private String name;

private int age;

Person() {

}

public Person(String name, int age) {

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;

}

@Override

public int hashCode() {

return this.name.hashCode() + age * 37;

}

@Override

public boolean equals(Object obj) {

if (obj instanceof Person) {

Person p = (Person) obj;

return this.name.equals(p.name) && this.age == p.age;

} else {

return false;

}

}

@Override

public String toString() {

return "Person@name:" + this.name + " age:" + this.age;

}

}