Problem with java.lang.reflect in Eclipse

Question

I'm just reading java tutorial about that library, but when i'm trying to execute those example program's e.g
import java.lang.reflect.Constructor;
import java.lang.reflect.Type;
import static java.lang.System.out;
public class ConstructorSift {
    public static void main(String... args) {
     try {
         Class<?> cArg = Class.forName(args[1]);
         Class<?> c = Class.forName(args[0]);
         Constructor[] allConstructors = c.getDeclaredConstructors();
         for (Constructor ctor : allConstructors) {
          Class<?>[] pType  = ctor.getParameterTypes();
          for (int i = 0; i < pType.length; i++) {
              if (pType.equals(cArg)) {
               out.format("%s%n", ctor.toGenericString());
               Type[] gpType = ctor.getGenericParameterTypes();
               for (int j = 0; j < gpType.length; j++) {
               char ch = (pType[j].equals(cArg) ? '*' : ' ');
               out.format("%7c%s[%d]: %s%n", ch,
                    "GenericParameterType", j, gpType[j]);
               break;
// production code should handle this exception more gracefully
     } catch (ClassNotFoundException x) {
     x.printStackTrace();
in Eclipse i've got nothing in my output console :/
no errors, no warnings, no text ..... (it was terminated correctly)
Can somebody tell me what should I do to make it work properly ?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

Hi,
In program arguments, you should not have ConstructorSift but only java.util.Formatter and java.util.Locale.
(Eclipse : run dialog | arguments tab | program arguments)
This is the output you should get:
$ java ConstructorSift java.util.Formatter java.util.Locale
public java.util.Formatter(java.util.Locale)
*GenericParameterType[0]: class java.util.Locale
public java.util.Formatter(java.lang.Appendable,java.util.Locale)
GenericParameterType[0]: interface java.lang.Appendable
*GenericParameterType[1]: class java.util.Locale
public java.util.Formatter(java.lang.String,java.lang.String,java.util.Locale) throws java.io.FileNotFoundException,java.io.UnsupportedEncodingException
GenericParameterType[0]: class java.lang.String
GenericParameterType[1]: class java.lang.String
*GenericParameterType[2]: class java.util.Locale
public java.util.Formatter(java.io.File,java.lang.String,java.util.Locale) throws java.io.FileNotFoundException,java.io.UnsupportedEncodingException
GenericParameterType[0]: class java.io.File
GenericParameterType[1]: class java.lang.String
*GenericParameterType[2]: class java.util.Locale
public java.util.Formatter(java.io.OutputStream,java.lang.String,java.util.Locale) throws java.io.UnsupportedEncodingException
GenericParameterType[0]: class java.io.OutputStream
GenericParameterType[1]: class java.lang.String
*GenericParameterType[2]: class java.util.Locale
Hope that help,
Jack