Hashcode Of A String In Java Many of the Java programmers know what 'Hashcode' means, but don't really know how exactly it is calculated and why 31 is used to calculate the hashcode. Below is the code snippet from Java 1.6, which calculates the hashcode for a string: publicinthashCode()...
那么String.hashCode()符合标准吗?试着运行这段代码: 代码语言:javascript 复制 importjava.io.BufferedReader;importjava.io.InputStreamReader;importjava.io.IOException;importjava.util.Collection;importjava.util.HashMap;importjava.util.HashSet;importjava.util.Map;importjava.util.Set;importjava.util.TreeSet;...
package com.cxh.test1; import java.util.HashMap; import java.util.HashSet; import java.util.Set; /** * Java学习交流QQ群：589809992 我们一起学Java！ */ class People{ private String name; private int age; public People(String name,int age) { this.name = name; this.age = age; } publ...
public String toString() { return getClass().getName() + "@" + Integer.toHexString(hashCode()); } 1. 2. 3. 4. 5. 6. 7. 8. 注意到hashCode方法前面有个native的修饰符,这表示hashCode方法是由非java语言实现的,具体的方法实现在外部,返回内存对象的地址。 在java的很多类中都会重写equals和hashC...
awk 实现java string的 hashcode 算法 java string 计算原理 code publicinthashCode() {inti =this.hash;if((i == 0) && (this.value.length > 0)) {char[] arrayOfChar =this.value;for(intj = 0; j <this.value.length; ++j) i= 31 * i +arrayOfChar[j];this.hash =i;...
今天我们接着聊聊String类型一个有趣的问题:hashCode 方法中的因子31。 前言 我们先来看看 String hashCode 方法是怎样实现的,如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicinthashCode(){int h=hash;if(h==0&&value.length>0){char val[]=value;for(int i=0;i<value.length;i++){h...
new String("a").hashCode() == new String("a").hashCode() 1. hashcode的官方解释 Oracle官方的解释为: hashCode public inthashCode() Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided byjava.util.Hashtable. ...
简介:为什么 String hashCode 方法选择数字31作为乘子? 1、源码 计算对象的hashcode: Object object = 1;System.out.println(object.hashCode());//输出1 首先看下String源码里的hashCode是如何实现的: public int hashCode() {int h = hash;if (h == 0 && value.length > 0) {char val[] = value;for...
某天,我在写代码的时候,无意中点开了 String hashCode 方法。然后大致看了一下 hashCode 的实现,发现并不是很复杂。但是我从源码中发现了一个奇怪的数字,...
The hashCode() method returns the hash code of a string.The hash code for a String object is computed like this:s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1] where s[i] is the ith character of the string, n is the length of the string, and ^ indicates ...