I’m making a game and want to implement cheat codes like the Konami code. But how do I check for that sequence of keystrokes? I want it to work so that if a player just types the code it will trigger. Thanks in advance! Answer Below is a class that checks for the Konami code, including cases such as …
Tag: java
Is it possible to generate a XSD from a JAXB-annotated class?
I’ve written a number of classes using JAXB for serialization and I was wondering if there was a way to generate a XSD file for each of these objects based on the annotations. Is there a tool for this? Something like generate-xsd com/my/package/model/Unit.java would be awesome. Does anything exist to do…
Java erasure with generic overloading (not overriding)
I have FinanceRequests and CommisionTransactions in my domain. If I have a list of FinanceRequests each FinanceRequest could contain multiple CommisionTransactions that need to be clawed back. Dont worry how exactly that is done. The class below (very bottom) makes me feel all fuzzy and warm since its succint…
JPA: unidirectional many-to-one and cascading delete
Say I have a unidirectional @ManyToOne relationship like the following: If I have a parent P and children C1…Cn referencing back to P, is there a clean and pretty way in JPA to automatically remove the children C1…Cn when P is removed (i.e. entityManager.remove(P))? What I’m looking for is a…
How to use conditional breakpoint in Eclipse?
I want to know how to place a conditional breakpoint in Eclipse. I have a code like: Now I want to put a breakpoint on the line with the arrow but want it to trigger only if: Answer Put your breakpoint. Right-click the breakpoint image on the margin and choose Breakpoint Properties: Configure condition as you…
How to add filters to servlet without modifying web.xml
I’d like the ability to modify/configure filters in a different way than web.xml. Here is a static configuration of 2 filters. I’d like the ability to have one filter statically configured and allow that filter to load additional filters. I just wanted to know if anyone knows of lib that already h…
Most efficient way to check if a file is empty in Java on Windows
I am trying to check if a log file is empty (meaning no errors) or not, in Java, on Windows. I have tried using 2 methods so far. Method 1 (Failure) Method 2 (Failure) Now both these methods fail at times when the log file is empty (has no content), yet the file size is not zero (2 bytes). What
BigDecimal – to use new or valueOf
I came across two ways of getting BigDecimal object out of a double d. new BigDecimal(d) BigDecimal.valueOf(d) Which would be a better approach? Would valueOf create a new object? In general (not just BigDecimal), what is recommended – new or valueOf? Answer Those are two separate questions: “What…
Placing a converted value inside a rich:simpleTogglePanel label
I’m in a situation where I need to place a date value inside a rich:simpleTogglePanel label. The problem is I need to converter the date prior to displaying it, using Then I need to place another string in front of it. Unfortunately label is an attribute and only takes a string. Is there anyway to do th…
Why do arrays change in method calls? [duplicate]
This question already has answers here: Are arrays passed by value or passed by reference in Java? [duplicate] (7 answers) Is Java “pass-by-reference” or “pass-by-value”? (93 answers) Closed last month. When I write like this: It prints x22; When I write like this: It doesn’t pri…