如果我们只覆盖类中的 hashCode() 并在 Set 中使用它会发生什么?

As I have not overridden equals method, the default implementation will return false. So where will be the Object with value "a" be kept, in the same bucket where the previous object with hashcode 97 kept? or will it create new bucket? anybody know how it will be stored internally?

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

class UsingSet {  

  String value;  

  public UsingSet(String value){  
    this.value = value;  
  }  

  public String toString() {  
    return value;  
  }  

  public int hashCode() {  
    int hash = value.hashCode();  
    System.out.println("hashcode called" + hash);  
    return hash;  
  }  

  public static void main(String args[]) {  

    java.util.Set s = new java.util.HashSet();  

    s.add(new UsingSet("A"));  
    s.add(new UsingSet("b"));  
    s.add(new UsingSet("a"));  
    s.add(new UsingSet("b"));   
    s.add(new UsingSet("a"));  

    s.add(new Integer(1));  
    s.add(new Integer(1));  

    System.out.println("s = " + s); 

  }  
}  

输出是:

hashcode called65
hashcode called98
hashcode called97
hashcode called98
hashcode called97
s = [1, b, b, A, a, a]

推荐答案

James Large 的答案不正确，或者说具有误导性(部分也不正确).我会解释的.