Micro optimizations in Java. String.equals benchmark

StringEquals.java

@BenchmarkMode(Mode.AverageTime)
@Fork(1)
@State(Scope.Thread)
@Warmup(iterations = 5, time = 1)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Measurement(iterations = 10, time = 1)
public class EmptyStringEquals {

   @Param({"", "nonEmptyString"})
   private String strParams;

   @Benchmark
   public boolean nonNullAndIsEmpty() {
       return strParams != null && strParams.isEmpty();
   }

   @Benchmark
   public boolean equalsPost() {
       return strParams != null && strParams.equals("");
   }

   @Benchmark
   public boolean preEquals() {
       return "".equals(strParams);
   }

}