resources.report.rules.pmd.EqualsNull.html Maven / Gradle / Ivy

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EqualsNull

EqualsNull

Tests for null should not use the equals() method. The ‘==’ operator should be used instead.


    
//PrimaryExpression
  [
    PrimaryPrefix[Name[ends-with(@Image, 'equals')]]
      [following-sibling::node()/Arguments/ArgumentList[count(Expression)=1]
          /Expression/PrimaryExpression/PrimaryPrefix/Literal/NullLiteral]

    or

    PrimarySuffix[ends-with(@Image, 'equals')]
      [following-sibling::node()/Arguments/ArgumentList[count(Expression)=1]
          /Expression/PrimaryExpression/PrimaryPrefix/Literal/NullLiteral]

  ]
    

Example(s):


       
String x = "foo";

if (x.equals(null)) { // bad form
   	doSomething();
	}
	
if (x == null) { 	// preferred
   	doSomething();
	}