HashTest以及对象唯一性(二)

package cn.cp;//在HashSetTest1的基础上重写hashCode()和equals()方法,来确保对象唯一性import java.util.HashSet;import java.util.Iterator;class Boy2 {private int age;private String name;public Boy2(int age, String name) {super();this.age = age;this.name = name;}public int getAge() {return age;}public String getName() {return name;}@Overridepublic int hashCode() {//返回新的hash值return name.hashCode()+age;}@Overridepublic boolean equals(Object obj) {Boy2 b=(Boy2) obj;boolean result=this.age==b.age&&this.name.equals(b.name);return result;}@Overridepublic String toString() {return "boy3 [age=" + age + ", name=" + name + "]";}}public class HashSetTest2 {public static void main(String[] args) {      Boy2 boy1=new Boy2(12, "liming");      Boy2 boy2=new Boy2(13, "liming");      Boy2 boy3=new Boy2(12, "liming");      HashSet hashSet=new HashSet();      hashSet.add(boy1);      hashSet.add(boy2);      hashSet.add(boy3);      Iterator iterator=hashSet.iterator();      while(iterator.hasNext()){      System.out.println(iterator.next());      }}}