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It makes no difference and it's a matter of personal preference. That said I like the second option best because the initialization, not being a one-liner, breaks the visual tidyness when there are s …

In layman's terms: I'd suggest you put it in the same package as the class whose method, having initially such a long signature, originated the need for such a paramter object. Parameter classes are …

Acording to that rationale, every anonymous class is a singleton, since they have no name, you cannot instantiate it more than once. One issue is that they have to live inside another class. IMHO th …

Constructors are not used for readability. In fact, I cannot think an example in which a constructor could be user for readability. The constructor in the example just gives an initial value to class …

Yes indeed. There's something called disk-based hash tables. You generate keys that correspond with a physical location in disk. The accepted answer in this SO question tells you a possible implement …

In layman's words You have to separate business logic from presentation logic. The game class (business logic) should not read input from console not from an HTML form. The game class (business logi …

First let's clarify something: You mention that after assigning null to the variable you could forget to initialize it, but by assigning null to it you are in effect initializing it. public static vo …

Yes, you are correct. ia is of class B ia is also of class A since B inherits A. B overrrides A's doA() method.

Think of it as static methods living in a non-object-oriented dimension. In the "object oriented dimension" a class can spawn multiples egos (instances), each ego has conscience of itself via its sta …

That cannot be done. Your problems arise from violating ISP. That said, the only idea I can think of is to force client classes to register with your classes in order to be able to call their methods …

Java successfully casts null to an Integer reference that references no object. That's OK because being unistantiated is a valid state for a reference. …

Short anwer: If the instance method has access to the instances variables then there is no need to pass those same values as parameters. If you want to create a class (static) methods, then such a me …

Short answer: You can return an array or a List with the two values. I personally would write two distinct methods, like int x = obj.getX(); int y = obj.getY();

For example in the Java API every class/interface has its constants. They are not in a Constants class/interface with hundreds of constants, either grouped into inner classes or not. …

The "create an smaller version of the problem" part can have loops. As long as the method calls itself passing as a parameter the smaller version of the problem, the method is recursive. Of course an …