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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 (String, BigDecimal or BigInteger) won’t change the object itself since 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.lang.java.rule.unnecessary.UselessOperationOnImmutableRule
Example(s):


    
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
  }
}