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

AvoidMultipleUnaryOperators
Using multiple unary operators may be a bug, and/or is confusing.
					Check the usage is not a bug, or consider simplifying the expression.
            
        

		
		
		    
    			
This rule is defined by the following XPath expression:
    			
    			
    
		        	
//UnaryExpression[
		./UnaryExpression
		or ./UnaryExpressionNotPlusMinus
		or ./PrimaryExpression/PrimaryPrefix/Expression/UnaryExpression
		or ./PrimaryExpression/PrimaryPrefix/Expression/UnaryExpressionNotPlusMinus
	]
|
//UnaryExpressionNotPlusMinus[
		./UnaryExpression
		or ./UnaryExpressionNotPlusMinus
		or ./PrimaryExpression/PrimaryPrefix/Expression/UnaryExpression
		or ./PrimaryExpression/PrimaryPrefix/Expression/UnaryExpressionNotPlusMinus
	]
		        	
            	
  
		    
		    
	    
	    
        
        
        
Example:
            
    
                
            [
            // These are typo bugs, or at best needlessly complex and confusing:
            int i = - -1;
            int j = + - +1;
            int z = ~~2;
            boolean b = !!true;
            boolean c = !!!true;

            // These are better:
            int i = 1;
            int j = -1;
            int z = 2;
            boolean b = true;
            boolean c = false;

            // And these just make your brain hurt:
            int i = ~-2;
            int j = -~7;