A servlet is simply a class which responds to a particular type of network request – most commonly an HTTP request. Basically servlets are usually used to implement web applications – but there are also various frameworks which operate on top of servlets (e.g. Struts) to give a higher-level abstraction than the “here’s an HTTP … Read more
I don’t think it would be useful to have a library function for factorial. There is a good deal of research into efficient factorial implementations. Here is a handful of implementations.
I know Java doesn’t have pointers, but I heard that Java programs can be created with pointers and that this can be done by the few who are experts in java. Is it true?
The java.lang.Character.getNumericValue(char ch) returns the int value that the specified Unicode character represents. For example, the character ‘\u216C’ (the roman numeral fifty) will return an int with a value of 50. The letters A-Z in their uppercase (‘\u0041’ through ‘\u005A’), lowercase (‘\u0061’ through ‘\u007A’), and full width variant (‘\uFF21’ through ‘\uFF3A’ and ‘\uFF41’ through ‘\uFF5A’) forms have numeric values from 10 through 35. This is … Read more
A static method belongs to the class itself and a non-static (aka instance) method belongs to each object that is generated from that class. If your method does something that doesn’t depend on the individual characteristics of its class, make it static (it will make the program’s footprint smaller). Otherwise, it should be non-static. Example: … Read more
Sure – you simply can’t apply the > operator between objects. What would you expect it to do? You can’t apply any of the other binary operators either – +, -, / etc (with the exception of string concatenation). Ideally, you should make your TreeNode generic, and either have a Comparator<T> which is able to compare any two instances, or make T extend Comparable<T>. Either way, … Read more
Just delete module-info.java at your Project Explorer tab.
I know Java doesn’t have pointers, but I heard that Java programs can be created with pointers and that this can be done by the few who are experts in java. Is it true?
Its is a new line