Java / Object, Class and Package
Good implementation of hashCode method in Java.
As per the expert's recommendation, the below steps are listed.
- Create a int
hashcodeResult
and assign it a non-zero value. - For every field f tested in the equals method,calculates its hash code value
c
using the following.- If the field f is a boolean: calculate
(f ? 0 : 1)
; - If the field f is a byte, char, short or int: calculate (int)f;
- field f is a long, calculate
(int)(f ^ (f >>> 32))
; - field f is a float, calculate
Float.floatToIntBits(f)
; - field f is a double, calculate
Double.doubleToLongBits(f)
and use the long value; - If the field f is an object: Use the result of the hashCode() method or 0 if f == null;
- If the field f is an array, consider every field as separate element and calculate the hash value in a recursive fashion and combine the values.
- If the field f is a boolean: calculate
- Combine the hash value
c
withhashcodeResult.
hashcodeResult=37+c+ hashcodeResult
. - Return the value of
hashcodeResult
.
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