More on Object-Oriented Programming. Based on slides from Deitel & Associates, Inc. Revised by T. A. Yang. Outline. Review: building classes, controlling access to members of a class, creating constructors
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Exercise: Use a class diagram to show the design of this application (Time1, TimeTest, and their associations).
Class Time1 does not declare a constructor, so the class has a default constructor that is supplied by the compiler.
Class Time2 (Fig. 8.5) contains five overloaded constructors that provide convenient ways to initialize objects of the new class Time2.
A program can declare a so-called no-argument constructor that is invoked without arguments.
It would seem that providing set and get capabilities is essentially the same as making the instance variables public.
Each enum declaration declares an enum class with the following restrictions:
static class members are available as soon as the class is loaded into memory at execution time.
A static method cannot access non-static class members, because a static method can be called even when no objects of the class have been instantiated.
private final intINCREMENT;
final variables can be initialized when they are declared or by each of the class’s constructors so that each object of the class has a different value.
Placing a package declaration at the beginning of a Java source file indicates that the class declared in the file is part of the specified package.
javac command-line option -d causes the javac compiler to create appropriate directories based on the class’s package declaration.
javac -d . Time1.java
The classpath consists of a list of directories or archive files, each separated by a directory separator
If no access modifier is specified for a method or variable when it’s declared in a class, the method or variable is considered as package-private (or package access).