一道Java基础题，来个牛人

Question

[code="java"]package com.huawei.test;

import java.util.HashMap;

public class HashTest {
public static void main(String[] args) {
getSize1();
getSize2();
}

public static void getSize1(){
    HashMap<Object, String> instance = new HashMap<Object, String>();
    instance.put(new String(), "xx");
    instance.put(new String(), "xx");
    System.out.println(instance.size());
}

public static void getSize2(){
    HashMap<Object, String> instance = new HashMap<Object, String>();
    instance.put(new HashObject(), "xx");
    instance.put(new HashObject(), "xx");
    System.out.println(instance.size());
}

private static class HashObject{

}

}[/code]

求打印结果是多少____和____?

Answer 1

1,2

两个String是同一对象，它们的hashcode一样
两个HashObject是两个不同对象，没重写hashcode,equals方法没重写