What is hashCode in Java?

The value 31 was chosen because it is an odd prime . If it were even and the multiplication overflowed, information would be lost, as multiplication by 2 is equivalent to shifting. The advantage of using a prime is less clear, but it is traditional.

hashCode in Java is a function that returns the hashcode value of an object on calling . It returns an integer or a 4 bytes value which is generated by the hashing algorithm. The process of assigning a unique value to an object or attribute using an algorithm, which enables quicker access, is known as hashing.24 Tem 2021

The hashCode method is an inbuilt method that returns the integer hashed value of the input value . Here are a few key concepts to remember: Multiple invocations of the hashCode must return the same integer value within the execution of a program unless the Object used within the equals method changes.