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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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UselessOperationOnImmutable


UselessOperationOnImmutable
An operation on an Immutable object (BigDecimal or BigInteger) won't change the object itself. The
    result of the operation is a new object. Therefore, ignoring the operation result is an error.
      
		
		
		    
		    
    		    
    		    
    		    

    		    This rule is defined by the following Java class:
    		    net.sourceforge.pmd.rules.UselessOperationOnImmutable
    		    
		    
	    
	    
        
        
        Example:
            
                    
    
import java.math.*;
class Test {
 void method1() {
  BigDecimal bd=new BigDecimal(10);
  bd.add(new BigDecimal(5)); // this will trigger the rule
 }
 void method2() {
  BigDecimal bd=new BigDecimal(10);
  bd = bd.add(new BigDecimal(5)); // this won't trigger the rule
 }
}