Error with no HashCode, Equals eclipse

I'm looking for a very specific eclipse plugin that will tell me if a class in my project is not implementing hashCode or/and equals methods.

Does anyone know of such a plugin?


Asked by: Lucas583 | Posted: 21-01-2022

Answer 1

Or you can use findbugs

The rule HE_EQUALS_NO_HASHCODE does what you want, and there is a plugin for eclipse

Answered by: Sydney723 | Posted: 22-02-2022

Answer 2

Can you not use the Checkstyle plugin and write your own Checkstyle rule? (There's a Checkstyle rule for overriding equals but not hashCode, but nothing to make sure that both are implemented for all classes, AFAIK.)

Answered by: Justin911 | Posted: 22-02-2022

Similar questions

java - HashCode vs SHA-1

I'd like to compare some large objects representing trees and cache something to avoid comparing each time the new object with one already existing... The question is what would be the best something ? (a compromise between performance and collisions...). On the one hand, I have a regular hashCode function based on the value of various fields (following the chapter 3 of

java - How to find hashcode validity?

In our application we generate hashcode from a java object and store it in the database at some level. Now my questions is if somebody generates a number by hand, is there a way i can find out whether it is a valid hashcode created by the JVM from an Object and not manually created by hand.

java - Hashcode and equals

equals and hashCode method must be consistent, which means that when two objects are equal according to equals method their hashCode method should return the same hash value. Java returns a unique hash code if we do not override the hashCode() method. class HashValue { int x; public boolean equals(Object oo) { // if(oo instanceof ...

Example of ==, equals and hashcode in java

Given this: String s1= new String("abc"); String s2= new String("abc"); String s3 ="abc"; System.out.println(s1==s3); System.out.println(s1==s2); System.out.println(s1.equals(s2)); System.out.println(s1.equals(s3)); System.out.println(s1.hashCode()); System.out.println(s2.hashCode()); System.out.println(s3.hashCode()); Output is: f...

java - C# HashCode Builder

I used to use the apache hashcode builder a lot Does this exist for C#

java - equals and hashCode

I am running into a question about equals and hashCode contracts: here it is Given: class SortOf { String name; int bal; String code; short rate; public int hashCode() { return (code.length() * bal); } public boolean equals(Object o) { // insert code here } } Which of the following will fulfill the equals() and hashCode() contracts for this cl...

Java hashCode from one field

Edit: Prepare my objects for the use within a HashMap. after reading a bit about how to generate a hash code, im kind of confused now. My (probably trivial) question is, how should I implement a hashCode method when I have one field that I could use? Can I use the fiels directly? If I understand correctly, the values for hashCode must not change during the lifetime of an object, and I only have an ID filed that fi...

Java hashCode of a POD?

I have this simple class public class Position{ int x; int y; Position(int x,int y){...} public int hashCode(){ Integer ix = this.x; Integer iy = this.y; return 13*iy.hashCode() + 43*ix.hashCode(); } } Im storing instances in a hashMap, but then cant retrieve them. I fear its the hashcode implementation. Is there any way to implement ...

java - Mutable objects and hashCode

Have the following class: public class Member { private int x; private long y; private double d; public Member(int x, long y, double d) { this.x = x; this.y = y; this.d = d; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + x; result = (int) (prime * result + y); result = (int) (prime * result + Double.doubleToLongBits(d)); ...

java - Why, If two objects are not equal according to equals, they are not required to return different hashCode values?

This question already has answers here:

Still can't find your answer? Check out these amazing Java communities for help...

Java Reddit Community | Java Help Reddit Community | Java Community | Java Discord | Java Programmers (Facebook) | Java developers (Facebook)