Multiple if 's or if with or operator

I and my friend wanted to try out which of the following way would help us decide the best way to execute a certain set of a statement if any three boolean variable is true. If it was this one or:

if (a || b || c) 
//statements

or this one

if (a) //statements;
else if (b) //statement;
else if (c) //statement;

so we ran a couple of tests to find out which is faster and found out that second one is faster than the second one is faster than the first one

Test Program:

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.math.BigInteger;

public class Hola {
    public static void main(String[] args) {
      boolean a=true,b=false,c=true;
      long time;
      long ifOrSum =0;
      long ifElseSum =0;
      for(int i =1;i<=1000000000;i++) {
          time = System.nanoTime();
          if (a || b || c) ;
          ifOrSum+=System.nanoTime() -time;
      }
      System.out.print("hey");
        for(int i =1;i<=1000000000;i++) {
            time = System.nanoTime();
            if (a);
            else if(b);
            else if(c);
            ifOrSum+=System.nanoTime() -time;
        }
        double d =(ifOrSum-ifElseSum)/1000000000;
        System.out.print(d);
    }
}

The program executes for around 4 minutes and the difference is around 70-80 seconds we would like to know why this 76 seconds of delay is being caused.