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 ...
For completeness, I have implemented GetHashCode also. using System; using System.Collections.Generic; using System.Linq; using GAF; using GAF.Extensions; using GAF.Operators; namespace ObjectBasedGene { internal class Program { private static void Main(string[] args) { //get our cities var ...
The @Data annotation is from the Lombok library and used to mark a POJO as a class that will hold data. This means getters, setters, the equals method, the hashCode method, and the toString method will be generated for that class. The @Id annotation marks the ID property as the ...
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 ...
The following utility class allows simple construction of an effective hashCode method. It's based on the recommendations of Effective Java, by Joshua Bloch. import java.lang.reflect.Array; /** * Collected methods which allow easy implementation of <tt>hashCode</tt>. * * Example use case: ...
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; ...