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It lets the compiler tell you when things are out of whack. And it gives you a way of building units of meaning that can be shared, extended, and explained. It could be better, but as it is, it’s pretty good. A Real Problem | 21 CHAPTER 3 Exceptions Few features of the Java language are as generally reviled and misunderstood as Java exceptions. Exceptions have to be declared as part of the signature of a method, and if an exception is declared as being thrown by a method, any code calling that method either needs to throw that same exception or needs to occur within a try block, and the calling method must include code that will catch the exception and deal with it.

The Java exception design is the way it is in part to make it easier to deal with these problems. But it is also the way it is in part to ensure that if a programmer ignores these problems, he does so consciously. If you want to ignore exceptions, you have to do so explicitly; just hoping that they never happen won’t be accepted by the compiler. Long experience shows that in a crunch, the only way to make a programmer do the right thing is to not generate code if he does the wrong thing. How It Works To see how this really works, let’s revisit our baseball statistics package that we started in Chapter 2.

The construction of a Throwable requires getting a lot of state from the machine, so there is a lot of additional overhead as well. But mostly you shouldn’t do this because it is an abuse of the feature, using it in a way in which it was never intended to be used. Anyone looking at your code will wonder what you are doing, and understanding the code will be that much harder. Since the whole purpose of Java is to aid in writing large-scale systems that can be understood and maintained over time, using a trick like this defeats the purpose of the language.

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