When the java compiler cannot infer the parameter type by itself for a static method, you can always pass it using the full qualified method name: Class . < Type > method(); Object list = Collections.<String> emptyList();
Replace exit with break. Exit isn’t a way to exit loops in Python. break statement docs
It’s a mechanism to avoid mistakes like this: if ( var = NULL ) { // … } If you write it with the variable name on the right hand side the compiler will be able catch certain mistakes: if ( NULL = var ) { // not legal, won’t compile // … } Of … Read more
It will be called just once. P.S. Calling it multiple times would make little sense. You would call it each time anew if you expected the result to be different each time. And how would you iterate over a continuously changing set?
Quick answer: ^[\w*]$ will match a string consisting of a single character, where that character is alphanumeric (letters, numbers) an underscore (_) or an asterisk (*). Details: The “\w” means “any word character” which usually means alphanumeric (letters, numbers, regardless of case) plus underscore (_) The “^” “anchors” to the beginning of a string, and … Read more
The tail position is a position which an expression would return a value from. There are no more forms evaluated after the form in the tail position is evaluated. Consider this example from The Joy of Clojure (defn absolute-value [x] (if (pos? x) x ; “then” clause (- x))) ; “else” clause It takes a … Read more
SELECT STATEMENT_DIGEST_TEXT in MySQL 8.0 can be used for MySQL query syntax validation. 8.0.4>SELECT STATEMENT_DIGEST_TEXT(‘FLUSH TABLES’)\G STATEMENT_DIGEST_TEXT(‘FLUSH TABLES’): FLUSH TABLES 8.0.4>SELECT STATEMENT_DIGEST_TEXT(“SET GLOBAL second_cache.key_buffer_size=128*1024;”)\G STATEMENT_DIGEST_TEXT(“SET GLOBAL second_cache.key_buffer_size=128*1024;”): SET GLOBAL `second_cache` . `key_buffer_size` = ? * ? ; 8.0.4>SELECT STATEMENT_DIGEST_TEXT(“create TABLE t1 ( a2 int unsigned not null, b2 int unsigned not null, c2 int unsigned … Read more
Actually, it’s a “functional dependency”. In this case that means that m uniquely identifies w — the type m determines the type w. (This may be a better link.)
An object initializer doesn’t; a collection initializer does. It’s so that it’s applied to classes which really represent collections, rather than just arbitrary ones which have an Add method. I have to admit that every so often I’ve “implemented” IEnumerable explicitly, just to allow collection initializers – but thrown a NotImplementedException from GetEnumerator(). Note that … Read more