keyword

问题 What is the difference between the keywords this and super ? Both are used to access constructors of class right? Can any of you explain? 回答1: Lets consider this situation class Animal { void eat() { System.out.println("animal : eat"); } } class Dog extends Animal { void eat() { System.out.println("dog : eat"); } void anotherEat() { super.eat(); } } public class Test { public static void main(String[] args) { Animal a = new Animal(); a.eat(); Dog d = new Dog(); d.eat(); d.anotherEat(); } }

问题 While playing this puzzle (It's a Java keyword trivia game), I came across the native keyword. What is the native keyword in Java used for? 回答1: The native keyword is applied to a method to indicate that the method is implemented in native code using JNI (Java Native Interface). 回答2: Minimal runnable example Main.java public class Main { public native int square(int i); public static void main(String[] args) { System.loadLibrary("Main"); System.out.println(new Main().square(2)); } } Main.c

问题 This question already has answers here : In Java compiler，which type can be defined as identifier ( ID ) or Keyword (reserved word)? (2 answers) Closed 4 years ago . I have studied about java which have listed 50 Java keywords. There is a homework of Lex, the goal is to recognize the word is keywords, IDs, symbols, operators. But there is one more little problem is the code below, is print in System.out.print() an ID or keyword? public class HelloWorld { public static int add(int a, int b) {

问题 I have a couple of tables which have keywords as column names. I am not able to write a subquery using them. Even if I use non-existing column names, the query works. For example CREATE TABLE tgt("view" int); CREATE TABLE src(id int); select * from tgt where view in (select view from src); view ------ (0 rows) select * from tgt where view in (select "view" from src); view ------ (0 rows) select * from tgt where "view" in (select "view" from src); view ------ (0 rows) select "view" from src;

问题 I am starting to make blogger templates from scratch and i am making a research about best SEO metadata for each post. I think the most logical way to use meta name=keywords is to use post labels as keywords but i don't understand why i cant retrieve the data and display it in the meta section as i can with the data from description. for expample: <b:if cond='data:blog.pageType != "error_page"'> <meta expr:content='data:blog.metaDescription' name='description'/> </b:if> puts the data comming

问题 I need to highlight each word separately from a string, even if the string is only one word. $keyword = 'should be bolded'; $string = 'This shouldbebolded'; Expected result: "This shouldbebolded ." This is the Google like highlight. 回答1: You can do this using explode, foreach and str_replace: <?php # Keywords $keywords_str = 'tv nice'; # String $string = 'My tv is nice'; # Operation result(to not modify $string) $result = $string; # Split $keywords by spaces into array of single keywords

问题 I am using the Microsoft.Diagnostics.Tracing.EventSource nuget package to write events to the eventlog. When defining keywords in my custom class inheriting from EventSource like this: public class Keywords { public const EventKeywords Page = ( EventKeywords ) 0x1; public const EventKeywords DataBase = ( EventKeywords ) 0x2; public const EventKeywords Diagnostic = ( EventKeywords ) 0x4; public const EventKeywords Perf = ( EventKeywords ) 0x8; } I get a manifest file containing the following

问题 Is there a way to have a variable set to an object and have another variable which is always equals to the former one? var x = new object(); var y = [synonym of x]; x = null; // then y = null as well I don't think this exists. So I've often used arrays to hold "references". var x = new object[] { new object() }; var y = x; x[0] = null; // then y[0] = null as well But it feels kinda lame. 回答1: You can do it but the price you have to pay is to use undocumented keywords/features. They're there

问题 I'm not sure where I saw this, and I'm certainly not getting the syntax past the compiler. Is it possible to use the 'class' C# keyword as part of a method parameter signature? foo(string x, class y) { } Anyone else see something like this? thanks, -gene 回答1: Should you be using object maybe? It looks like you are trying to specify a parameter that can have any type, in which case you should use object, since everything derives from it. 回答2: I don't think you can use it as in your example,

问题 All, I'm building a site which will gather news stories from about 35 different RSS feeds, storing in an array. I'm using a foreach() loop to search the title and description to see if it contains one of about 40 keywords, using substr() for each article. If the search is successful, that article is stored in a DB, and ultimately will appear on the site. The script runs every 30 mins. Trouble is, it takes 1-3 mins depending on how many stories are returned. Not 'terrible' but on a shard