practical difference between interpreter and compiler .

public class TimeArray 
{
    public static void main (String args[]) 
   {
         int something = 2;
         long startTime = System.currentTimeMillis();
         for (int i=0, n=Integer.MAX_VALUE; i<n; i++) 
         {
              something =- something;
         }

         long midTime = System.currentTimeMillis();
         for (int i=Integer.MAX_VALUE-1; i>=0; i-) 
        {
              something = -something;
        }
        long endTime = System.currentTimeMillis();
        System.out.println("Increasing Delta: " + (midTime - startTime));
        System.out.println("Decreasing Delta: " + (endTime - midTime));
   }
}



now if you compile this program means if you want to convert it into byte code ... for this we use " javac TimeArray.java" now the byte code is ready in the form of jvm understanding code . now jvm comes is the role and play its game with machine . it converts this program or deals with this byte code . and for dealing it uses jit compiler 
and for it we write " java TimeArray " and the output came in only 5 seconds but if you want to use interpreter in the place of compiler than you can use "java -Djava.compiler="" TimeArray " and the output came in 53 seconds ... this is a beautiful thing wow , i love it ...


                                                thanks tushar .