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Sanity4J was created to simplify running multiple static code analysis tools on the Java projects. It provides a single entry point to run all the selected tools and produce a consolidated report, which presents all findings in an easily accessible manner.

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OverrideBothEqualsAndHashcode

OverrideBothEqualsAndHashcode

Override both public boolean Object.equals(Object other), and public int Object.hashCode(), or override neither. Even if you are inheriting a hashCode() from a parent class, consider implementing hashCode and explicitly delegating to your superclass.
This rule is defined by the following Java class: net.sourceforge.pmd.lang.java.rule.basic.OverrideBothEqualsAndHashcodeRule
Example(s):


  
public class Bar {		// poor, missing a hashcode() method
	public boolean equals(Object o) {
      // do some comparison
	}
}

public class Baz {		// poor, missing an equals() method
	public int hashCode() {
      // return some hash value
	}
}

public class Foo {		// perfect, both methods provided
	public boolean equals(Object other) {
      // do some comparison
	}
	public int hashCode() {
      // return some hash value
	}
}