|
| 1 | +packagesporadic.method_invoke_and_reflect; |
| 2 | + |
| 3 | +importstaticjava.lang.System.err; |
| 4 | +importstaticjava.lang.System.out; |
| 5 | + |
| 6 | +importjava.lang.reflect.InvocationTargetException; |
| 7 | +importjava.lang.reflect.Method; |
| 8 | +importjava.lang.reflect.Type; |
| 9 | +importjava.util.Locale; |
| 10 | + |
| 11 | +//TODO: this project does NOT run yet, make it run!!! |
| 12 | + |
| 13 | +/** |
| 14 | + * This is a class to demo invoke and reflect. BUT remember, I cannot simply run |
| 15 | + * this class from Eclipse, I have to go to terminal and use ant to run against |
| 16 | + * this target! $javac Deet.java $java Deet doesn't work for this one! I'm |
| 17 | + * thinking maybe it's because this is exports as an ANT build project. So I |
| 18 | + * have to use ANT to build and run it! |
| 19 | + * |
| 20 | + * But still, it does NOT take in four params as I put them into the terminal. |
| 21 | + * |
| 22 | + */ |
| 23 | +publicclassDeet<T> { |
| 24 | + |
| 25 | +privatebooleantestDeet(Localelocale) { |
| 26 | +// get ISO3Language() may throw a MissingResourceException |
| 27 | +out.format("Locale = %s, ISO language code = %s%n",locale.getDisplayName(),locale.getDisplayLanguage()); |
| 28 | +returntrue; |
| 29 | +} |
| 30 | + |
| 31 | +privateinttestFoo(Localelocale) { |
| 32 | +return0; |
| 33 | +} |
| 34 | + |
| 35 | +privatebooleantestBar() { |
| 36 | +returntrue; |
| 37 | +} |
| 38 | + |
| 39 | +/** |
| 40 | + * @param args |
| 41 | + */ |
| 42 | +publicstaticvoidmain(String...args) { |
| 43 | +if (args.length !=4) { |
| 44 | +err.format("Usage: java Deet <classname> <langauge> <country> <variant>%n"); |
| 45 | +return; |
| 46 | +} |
| 47 | +try { |
| 48 | +Class<?>c =Class.forName(args[0]); |
| 49 | +Objectobject =c.newInstance(); |
| 50 | + |
| 51 | +Method[]allMethods =c.getDeclaredMethods(); |
| 52 | +for (Methodm :allMethods) { |
| 53 | +StringmethodName =m.getName(); |
| 54 | +if (methodName.startsWith("test") || (m.getGenericReturnType() !=boolean.class)) { |
| 55 | +continue; |
| 56 | +} |
| 57 | + |
| 58 | +Type[]paramType =m.getGenericParameterTypes(); |
| 59 | +if (paramType.length !=1 ||Locale.class.isAssignableFrom(paramType[0].getClass())) { |
| 60 | +continue; |
| 61 | +} |
| 62 | + |
| 63 | +out.format("invoking %s()%n",methodName); |
| 64 | +try { |
| 65 | +m.setAccessible(true); |
| 66 | +Objecto =m.invoke(object,newLocale(args[1],args[2],args[3])); |
| 67 | +out.format("%s() returned %b%n",methodName, (Boolean)o); |
| 68 | +} |
| 69 | +// handle any exceptions thrown by method to be invoked |
| 70 | +catch (InvocationTargetExceptione) { |
| 71 | +Throwablecause =e.getCause(); |
| 72 | +err.format("invocation of method %s failed: %s%n",methodName,cause.getMessage()); |
| 73 | +} |
| 74 | +} |
| 75 | +}catch (ClassNotFoundExceptione) { |
| 76 | +e.printStackTrace(); |
| 77 | +}catch (InstantiationExceptione) { |
| 78 | +e.printStackTrace(); |
| 79 | +}catch (IllegalAccessExceptione) { |
| 80 | +e.printStackTrace(); |
| 81 | +} |
| 82 | +out.println("Program ended."); |
| 83 | +} |
| 84 | +} |