JCF框架hashset中hashcode()和equals()的用法

package quickstart;

import java.util.HashSet;
import java.util.Iterator;

/**
* Created by patkritLee on 2017/2/28.
*/
public class HelloWorld {
public static void main(String[] args) {
HashSet has = new HashSet();
has.add(new Person("a1",11));
has.add(new Person("a2",12));
has.add(new Person("a3",13));
has.add(new Person("a4",14));
System.out.println("a1:"+ has.contains(new Person("a1",11)));
Iterator it = has.iterator();
while(it.hasNext()){
Person p = (Person)it.next();
System.out.println(p.getName()+"::"+p.getAge());
}
}
}
class Person{
private String name;
private int age;
Person(String name,int age){
this.name = name;
this.age = age;
}
void SetName(String name){
this.name = name;
}
void SetAge(int age){
this.age = age;
}
String getName(){
return name;
}
int getAge(){
return age;
}
public int hashCode(){
System.out.println(this.name+"...hashCode");
return name.hashCode()+age*37;
}
public boolean equals(Object obj) {
if (!(obj instanceof Person))
return false;
Person p = (Person) obj;
System.out.println(this.name + "...equals..." + p.name);
return this.name.equals(p.name) && this.age == p.age;
}
}

"C:\Program Files\Java\jdk1.8.0_111\bin\java" -Didea.launcher.port=7533 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2016.3.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_111\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\rt.jar;E:\java\workspace\HelloWorld\out\production\HelloWorld;C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2016.3.1\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain quickstart.HelloWorld
a1...hashCode
a2...hashCode
a3...hashCode
a4...hashCode
a1...hashCode
a1...equals...a1
a1:true
a3::13
a1::11
a4::14
a2::12

Process finished with exit code 0