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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.rules.OverrideBothEqualsAndHashcode
    		    
		    
	    
	    
        
        
        Example:
            
                    
  
// this is bad
public class Bar {
  public boolean equals(Object o) {
      // do some comparison
  }
}

// and so is this
public class Baz {
  public int hashCode() {
      // return some hash value
  }
}

// this is OK
public class Foo {
  public boolean equals(Object other) {
      // do some comparison
  }
  public int hashCode() {
      // return some hash value
  }
}