AP COMPUTER SCIENCE A: STATIC METHODS: 07.03: DEFINING NEW STATIC METHODS: PART 2
这是一个c++面向对象设计的practice
Parameters and Return Values
Initially, most students don't like top-down design and procedural abstraction
with methods because they were just getting used to writing programs in the
simpler style. Plus, it just seems like extra typing to get the same output. Don't
rush into judgment; we are preparing you for a whole new level of
programming. While it is true that your programs are longer, pay attention to
how efficient the main() method has become; its primary task now is to
manage the flow to control and invoke methods.
Part 1 Part 2^
Part 1
The roots of the procedural programming style are deeply entrenched in the use of the earliest computers for data
processing (e.g., ballistics tables, company payrolls, etc.); however, it provides a useful transition from writing all of
the code in the main method to Object-Oriented Programming. One of the major benefits of relocating code into
modules is reusability. In fact, you are already reusing code every time you invoke a method from Java's API. For
example, if you needed to know the absolute value of a number, you could type the following:
public static int absVal(int x)
{
if(x < 0)
return x * -1;
else
return x;
}
...
int num = absVal(-12);
Or just make use of the abs() method. The abs() method is already provided in the math class; there is no need
to reinvent it or to type eight lines when one will do.
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Objectives
After completing this lesson, you will be able to:
Implement top-down development techniques.
Implement procedural abstraction.
Create method declarations.
Utilize methods for program flow of control.