哈希泄露与java配置问题

package com.itcast.simulate;import java.io.FileInputStream;import java.io.InputStream;import java.util.ArrayList;import java.util.Collection;import java.util.HashSet;import java.util.Properties;public class ReflectTest {public static void main(String[] args) throws Exception{//用完整的路径不是硬编码,而是运算出来的//eclipse把非java文件搬到class下面去了//InputStream ips=new FileInputStream("config.properties");//第二种方式classpath,以后面临不会给src//InputStream ips=ReflectTest.class.getClassLoader().getResourceAsStream("config.properties");//其实class里面也提供了方法,如下InputStream ips=ReflectTest.class.getResourceAsStream("/config.properties");Properties props=new Properties();props.load(ips);ips.close();String className=props.getProperty("className");Collection collection=(Collection)Class.forName(className).newInstance();Dog dog1=new Dog(1,"jude");Dog dog2=new Dog(1,"jude");Dog dog3=new Dog(3,"ted");Dog dog4=new Dog(4,"maodan");collection.add(dog1);collection.add(dog2);collection.add(dog3);collection.add(dog4);collection.add(dog4);//System.out.println(collection.remove(dog1));//System.out.println(collection.remove(dog2));System.out.println(collection.size());System.out.println("dog1==dog2吗?--->>"+(dog1==dog2));System.out.println("dog1 eques dog2吗?--->>"+(dog1.equals(dog2)));}}

package com.itcast.simulate;public class Dog {private int id;private String name;public int getId() {return id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Dog(int id, String name) {this.id = id;this.name = name;}@Overridepublic int hashCode() {final int prime = 31;int result = 1;result = prime * result + id;result = prime * result + ((name == null) ? 0 : name.hashCode());return result;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (obj == null)return false;if (getClass() != obj.getClass())return false;final Dog other = (Dog) obj;if (id != other.id)return false;if (name == null) {if (other.name != null)return false;} else if (!name.equals(other.name))return false;return true;}public void setId(int id) {this.id = id;}}