I asked here how I should handle the situation when I need to inform observers only when specific attribute of object changes. I received very nice reply with reference to GoF where is written: …
I asked here how I should handle the situation when I need to inform observers only when specific attribute of object changes. I received very nice reply with reference to GoF where is written: …
I have the following code: interface Ops{ void remove(); } interface BeforeRemove{ void doBeforeRemove(); } class A implements Ops{ @Override public void remove() { System….
Here is some code I’ve written to save a UrlEntity : public UrlEntity saveUrlEntity(String longUrl, LocalDate dateAdded) { int urlLength = longUrl.length(); if (urlLength >= Constants….
I wonder which design pattern should I use in my case: I have 2 endpoints that use 2 service methods, each very similar, they differ only in invoking some different methods from the same service: My …
Factory pattern violates the OCP principle because it uses if() statements, which implies that if any class is added then the factory class has to change, being against SOLID principles. Self …
I am trying to build a visitor implementation that will convert a string array to unicode. I am using the following grammar: grammar ArrayInit; init : ‘{‘ value (‘,’ value)* ‘}’ ; value : init …
I have an interesting problem that I’m having trouble coming up with a clean solution for. My application reads collections of json objects that it needs to deserialize to this or that class type …
I understand that the N+1 problem is where one query is executed to fetch N records and N queries to fetch some relational records. But how can it be avoided in Hibernate?
I have a if else statement which might grow in the near future. public void decide(String someCondition){ if(someCondition.equals(“conditionOne”)){ // someMethod(…
I’m reading the chapter 12 on the Combined Pattern in Head First Design Patterns. On page 541,the sample DJView,it cant’t run correctly in my computer.when i press the ‘start’, the program only sounds …