hashCode（）是如何用Java计算的 [英] How is hashCode() calculated in Java

问题描述

什么值 hashCode（）方法在java中返回？

What value is hashCode() method is returning in java?

我读到它是一个内存对象的引用...当我为打印哈希值时，新的整数（1）它是1; for String（a）是97.

I read that it is an memory reference of an object... When I print hash value for new Integer(1) it is 1; for String("a") is 97.

我很困惑：是ASCII还是什么类型的值是什么？

I am confused: is it ASCII or what type of value is?

推荐答案

哈希码是一个整数值，表示调用它的对象的状态。这就是设置为1的 Integer 将返回哈希码1的原因，因为 Integer的哈希码及其价值是一回事。字符的哈希码等于它的ASCII字符代码。如果你编写一个自定义类型，你负责创建一个好的 hashCode 实现，它最能代表当前实例的状态。

A hashcode is an integer value that represents the state of the object upon which it was called. That is why an Integer that is set to 1 will return a hashcode of "1" because an Integer's hashcode and its value are the same thing. A character's hashcode is equal to it's ASCII character code. If you write a custom type you are responsible for creating a good hashCode implementation that will best represent the state of the current instance.

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