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

问题描述

java中hashCode()方法返回什么值?

What value does the hashCode() method return in java?

我读到它是一个对象的内存引用...new Integer(1) 的哈希值为 1；String("a") 的哈希值为 97.

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

我很困惑:它是 ASCII 还是什么类型的值?

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.这就是为什么设置为 1 的 Integer 将返回1"的哈希码，因为 Integer's 哈希码和它的值是相同的.一个字符的哈希码等于它的 ASCII 字符码.如果您编写自定义类型，则您有责任创建一个良好的 hashCode 实现，以最好地表示当前实例的状态.

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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