8 Creating and using methods
| Exam objectives covered in this chapter |
What you need to know |
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| [7.1] Create methods and constructors with arguments and return values |
Creation of methods with correct return types and method argument lists. Creation of methods with the same names, but a different set of argument lists. |
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| [7.2] Create and invoke overload constructors |
Difference between overloading methods and constructors. A default constructor isn’t the same as a no-argument constructor. Java defines a no-argument constructor when no user-defined constructors are created. User-defined constructors can be overloaded. |
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| [7.3] Apply the static keyword to methods and fields |
The implication of defining fields and methods as static members. |
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Methods are the powerhouse of Java – you use them to define behavior of your interfaces and classes. For the exam, and in general (to program well using Java), you must know the rules and do’s and don’ts of defining methods and constructors and overloading them. This chapter also covers how to create instance or static members by using the static modifier. Overriding methods isn’t covered in this chapter. It is in covered in chapter 10 with coverage of inheritance.
This chapter will help you answers questions on the following topics:
- Creating methods and constructors.
- Overloading methods and constructors.
- Identifying incorrectly overloaded methods and constructors..
- Implications of using static modifier with fields, initializer blocks and methods