Writing a hash function in Java:a practical guide to implementing hashCode()If you started by reading this site's introduction to hash maps, then you probably saw the example of the hash function of the String class. This function works by combining the values of all characters making up ...
If we need to emit a custom object which has no default wrapper, we need to create a class that implements the WritableComparable interface. In the mean example we saw onthis post, we used the SumCount class, which is a class that implements WritableComparable (the source code is available ...
Implementing hashCode hashCode importjava.time.LocalDate;importjava.util.List;importjava.util.Objects;importjava.util.Set;/** With respect to implementing equals and hashCode, the simplest case is to simply never use primitive fields or array fields. If a significant field is an array, then ...
result = HashCodeUtil.hash(result, name); result = HashCodeUtil.hash(result, radius); hashCode = result; }returnhashCode; }/** This method is overridable. */publicbooleancanEqual(Object that) {return(thatinstanceofStar); }// PRIVATEprivateString name;privateBigDecimal radius;privateinthashCode; ...