variadic-functions

I just came across varargs while learning android( doInBackground(Type... params) ) , SO posts clarified the use of it My question is why can't we just use Arrays instead of varargs public void foo(String...strings) { } I can replace this type of a call by packing my variable number of arguments in an array and passing it to a method such as this public void foo(String[] alternativeWay){ } Also does main(String[] args) in java use varargs , if not how are we able to pass runtime parameters to it Please suggest the benefits or use of varargs and is there there anything else important to know

If I declare just the 2 varargs methods as follows: public void foo(String... strings) { System.out.println("Foo with Strings"); } and public void foo(int... ints) { System.out.println("Foo with ints"); } and then have the code: foo(); this is a compiler error due to the ambiguity as expected. However if I have just the following 2 versions of foo: public void foo(Object... objects) { System.out.println("Foo with Objects"); } and public void foo(int... ints) { System.out.println("Foo with ints"); } then the code foo(); calls the ints version of the method. Can anyone explain why the second

I want to get rid of this lot... public void info(String msg); public void info(String format, Object arg); public void info(String format, Object arg1, Object arg2); public void info(String format, Object[] argArray); ...and replace it with this one... public void info(String format, Object ... args); ...so that my logging syntax doesn't have to change depending on the number of arguments I want to log. There seems to be lots of discussion and work around it, but where is it? Or should I wrap the wrapper that is slf4j? Briggs The real question is "Why must a jdk < 5 be supported by this any

C#/.NET has variadic function parameters by passing an Array type by-reference (as opposed to C/C++ which just places all of the values directly on the stack, for better and for worse). In the C# world this has a neat advantage of allowing you to call the same function with either 'raw' arguments or a reusable array instance: CultureInfo c = CultureInfo.InvariantCulture; String formatted0 = String.Format( c, "{0} {1} {2}", 1, 2, 3 ); Int32 third = 3; String formatted0 = String.Format( c, "{0} {1} {2}", 1, 2, third ); Object[] values = new Object[] { 1, 2, 3 }; String formatted1 = String.Format

In answering another question I came across something I didn't expect with Clojure's variable arity function args: user=> (defn wtf [& more] (println (type more)) :ok) #'user/wtf ;; 1) user=> (wtf 1 2 3 4) clojure.lang.ArraySeq :ok ;; 2) user=> (let [x (wtf 1 2 3 4)] x) clojure.lang.ArraySeq :ok ;; 3) user=> (def x (wtf 1 2 3 4)) clojure.lang.PersistentVector$ChunkedSeq #'user/x user=> x :ok Why is the type ArraySeq in 1) and 2), but PersistentVector$ChunkedSeq in 3)? Short answer: It's an obscure implementation detail of Clojure. The only thing guaranteed by the language is that the rest

Using Stream.of to create generic streams is very convenient, but what if I want to create a Stream<String[]> of only one element? Let’s say I have: String[] tropicalFruits = new String[] {"pineapple", "banana", "mango"}; String[] fruits = new String[] {"melon", "peach", "apple"}; Then Stream.of(tropicalFruits, fruits) produces a Stream<String[]> of two elements. How can I achieve the same for a stream of a single element? If I try: Stream<String[]> fruityStream = Stream.of(tropicalFruits); I get: Error: incompatible types: inference variable T has incompatible bounds equality constraints:

How can we take multiple number of integer inputs by user choice in c in runtime. Here the first line of the input is the number of test cases . Then I am calculating the sum of the input numbers in this case. The test case : Input 3 1 6 7 2 7 3 4 2 1 Output: 14 16 3 Can we modify scanf() in this way so it can process this dynamic inputs. I can't take the line as a string input and then split them into numbers. Can we use the space and \n both to decide the numbers as we do to take strings as input as an example: scanf("%[^\n]",&str); The answer was provided by BLUEPIXY by his nice code. Here

Is it possible to use @selector and performSelector: (or similar) with methods using variable arguments list? I'm writing a class that can be assigned a delegate to override the default behavior. In the presence of a delegate select method calls made on an instance of that class will be forward to the same corresponding delegate method, some which use variable argument lists. So, for instance, I need to be able to create retrieve SEL reference and message the delegate object with a method such as this: - (void)logEventWithFormat:(NSString *)format, ... { va_list argList; id del = self.delegate