autoboxing effects on performance in java

autobox.java

public class TestAutoBox {
  public static void main( String[] args) {
    long timerStart = System.currentTimeMillis();
    Integer min = Integer.MAX_VALUE;
    //int min = Integer.MAX_VALUE;
    for(int i=Integer.MAX_VALUE; i>=0; i--) {
      min = i<min?i:min;
    }
    System.out.println( System.currentTimeMillis() - timerStart);
  }
}