Enrico Scantamburlo

My drawback with the Scanner is that is really slow. According to my benchmarking, it was 2 times slower than BufferedReader.

When I was using Java7 I usually implement this code to convert list to string

Iterator<String> it = cities.iterator();
StringBuilder csvBuilder = new StringBuilder();
while (it.hasNext()) {
csvBuilder.append(it.next());
if (it.hasNext()) {
csvBuilder.append(',');
}
}
String csv = csvBuilder.toString();

I think it is better than the for loop because you don't have to check at the end for the separator

I agree to all the suggestions of this article but I have found a small glitch in the example of the Common Mistake #7 .

The programmer should not ever catch RuntimeExceptions (like NullPointerException ones) , they are meant for "programming errors". The programmer should handle them like:

Connection conn = database.getConnection() if(conn != null){ // do something with conn } else { // throw a more meaningful connection // or show some message to the user }

Ciao and thanks for the tutorial . I took a look also on the NetBeans wiki and they say that I cannot pack some jars in my installer, like jce.jar, http://wiki.netbeans.org/NBIBundledJVM .

I really need those files for my application. Do you know something about that?

Ciao and thanks for the tutorial . I took a look also on the NetBeans wiki and they say that I cannot pack some jars in my installer, like jce.jar, http://wiki.netbeans.org/NBIBundledJVM .

I really need those files for my application. Do you know something about that?

My java version

package harshad; /** * * @author Enrico Scantamburlo <scantamburlo at streamsim.com> */ public class Harshad { /** * @param args the command line arguments */ public static void main(String[] args) { long s = System.currentTimeMillis(); for (int i = 1; i < 10000; i++) { if (isHarshad(i)) { System.out.println(i); } } long e = System.currentTimeMillis(); System.out.println("T: " + (e - s)); } protected static boolean isHarshad(int i) { int sum = 0; int reminder = i; while (reminder != 0) { int tmp = reminder % 10; sum += tmp; reminder -= tmp; reminder /= 10; } return i % sum == 0; } }

My java version

package harshad; /** * * @author Enrico Scantamburlo <scantamburlo at streamsim.com> */ public class Harshad { /** * @param args the command line arguments */ public static void main(String[] args) { long s = System.currentTimeMillis(); for (int i = 1; i < 10000; i++) { if (isHarshad(i)) { System.out.println(i); } } long e = System.currentTimeMillis(); System.out.println("T: " + (e - s)); } protected static boolean isHarshad(int i) { int sum = 0; int reminder = i; while (reminder != 0) { int tmp = reminder % 10; sum += tmp; reminder -= tmp; reminder /= 10; } return i % sum == 0; } }