View by Classes

Findings - Overview

warning UselessOperationOnImmutable (PMD)

An operation on an Immutable object (String, BigDecimal or BigInteger) won't change the object itself (sample)

An operation on an Immutable object (String, 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.

    
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
 }
}
    
      

Additional info can be found at this http://pmd.sourceforge.net/rules/basic.html#UselessOperationOnImmutable site.