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In general, the more public stuff you expose to the world, the less free you are to make changes later without breaking someone else s code. The less you expose, the more flexibility you have for implementation changes later. And you know there are always changes. So, making variables, methods, and classes as restricted as you can while limiting what you expose to your public interface, you ll be in good shape down the road. Obviously there are other subtle issues about inheritance (as in, what does a subclass get access to ), so there s more to consider here, but in general, be thinking about reducing your exposure (think of it as reducing your liability down the road). This is closely related to reducing the scope of variables.

If you ve got a method that needs to behave differently depending on the kind of thing it was actually handed, consider overloading it. Any time you see if or switch blocks testing the type of an argument, you should probably start thinking about overloading the method. And while you re at it

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This simply means " " " " that, vectorially speaking, in order for R to be the true vector sum of A and B, R must be " and B as opposite " equal to the DIAGONAL OF THE PARALLELOGRAM having A sides of the parallelogram With this in mind, consider Fig 2-A; we know, from actual experience, that displace" " ment A, plus displacement B, produces exactly the same nal result as would the single " But study of Figs 3-A and 4-A shows that R is equal to the diagonal of the " vector R " and B as opposite sides; thus displacement is a true vector " parallelogram having A quantity " " To illustrate the above graphical procedure, consider Fig 5-A, in which A and B are given to be two vector quantities at an angle a, as shown.

If you have a ton of arguments coming into a method, perhaps you need to encapsulate the stuff you need in that method into a class of its own type.

You already know that you can t access any nonstatic things prior to your superconstructor running, but keep in mind that even after an object s superconstructor has completed, the object is still in an incomplete state until after its constructor has finished. Polymorphism still works in a constructor. So if B extends A, and A calls a method in its constructor that B has overridden, well, guess what happens when somebody makes an instance of B. You got it. The B constructor invokes its superconstructor (A s constructor). But inside the A constructor it invokes one of its own methods, but B has overridden that method. B s method runs! In other words, an object can have one of its methods invoked even before its constructor has completed! So while B isn t even a fully formed object, it can still be running code and even accessing its own instance variables. This is a problem because its instance variables have not yet been initialized to

Let the problem be to nd, " " " " graphically, the resultant vector R, where R A B " and B are given to be vector quantities, the rst step is to construct a paralle" Since A " " logram with A and B as opposite sides, as in Fig 6-A The diagonal of the parallelogram, " " " " drawn from the junction of A and B, is the resultant of the two vectors A and B; that is, it " " " A B is the graphical solution of the equation R.

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anything other than default values, even if they re given explicit values when they re declared. Yikes! So don t do it. If it s a final or private instance method, then you re safe since you know it ll never be overridden.

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