What are the differences between hashCode () and equals ()

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If the two objects hashCode () are the same, does equals () have to be true?

First of all, the answer is definitely not necessarily. At the same time, the reverse equals is not necessarily the same as true,hashCode.

Both the hashCode and equals methods of the class can be overridden, and the values returned are entirely self-defined.

HashCode () returns the hash code value of the object; equals () returns whether the two objects are equal.

There are some general agreements about the hashCode and equal methods:

1. Comparing two objects with equals () returns true, then the hashCode () method of the two objects must return the same result.

2. Comparing two objects with equals () returns false, which does not require the hashCode () method to return different values, but it is best to return different values to improve the performance of the hash table.

3. Override the equals () method. You must override the hashCode () method to ensure that the two objects hashcode return the same value when the equals method is equal.

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