How to create JSON Object using String?
JSONArray may be what you want.
Java
Reflection generic get field value
Like answered before, you should use: Another way, which is sometimes prefered, is calling the getter dynamically. example code: Also be aware that when your class inherits from another class, you need to recursively determine the Field. for instance, to fetch all Fields of a given class;
How to resolve “Syntax error on token “else”” in Java?
The problem is the semicolon after the if. The grammar is if ( condition ) expression-or-block { else expression-or-block } Since ; is an empty expression, this works for an if clause and nothing happens in the then clause – in your case syntactically there is no else clause, since your if statement statements ends … Read more
Unreachable statement compile error in Java
The compiler is also able to make that conclusion, and assumes you are making a mistake. And yes, the Java compiler does a pretty good amount of “Data-Flow Analysis”. The most common related message is the one about variables not initialized. The second most frequent is, I believe, precisely this one, about code not reachable.
Adding a timer to my program (javafx)
Timer is used to schedule tasks.. So where do you write those tasks?? Well you have to write those tasks in a TimerTask class… Confused ? Let me break it down, Now you have created a object of Timer class .. Now you have to do some task right? So to do that create an object of TimerTask. Now you … Read more
method does not override method in its superclass
The class Fragment or any of its super classes seem not to have the method public void setTitle(CharSequence title) so you can’t use the @Override annotation. You can remove that annotation and you should be fine.
How to calculate the intersection of two sets?
Use the retainAll() method of Set: If you want to preserve the sets, create a new set to hold the intersection: The javadoc of retainAll() says it’s exactly what you want: Retains only the elements in this set that are contained in the specified collection (optional operation). In other words, removes from this set all of its elements that are not contained in the … Read more
Unclosed Character Literal error
In Java, single quotes can only take one character, with escape if necessary. You need to use full quotation marks as follows for strings: You also used which I assume should be Note: When making char values (you’ll likely use them later) you need single quotes. For example:
Corrupt jar file
This will happen when you doubleclick a JAR file in Windows explorer, but the JAR is by itself actually not an executable JAR. A real executable JAR should have at least a class with a main() method and have it referenced in MANIFEST.MF. In Eclispe, you need to export the project as Runnable JAR file instead of as JAR file to get a real … Read more
Call a Class From another class
Suposse you have Class1 Class2 and then you can use Class2 in different ways. Class Field Method field Static methods from Class2 Imagine this is your class2. from class1 you can use doSomething from Class2 whenever you want