Learning Java: Beginning programming with java for dummies by John Bach

Author:John Bach [Bach, John]
Language: eng
Format: azw3, epub
Published: 2020-09-14T16:00:00+00:00

Unfortunately, only the class files automatically to extract the archive to be found in the image files and others . in the Java program itself, you must use the appropriate library methods (see, for example, [1] , p. 612 ).

Class design guidelines

1. Fields of classes should be closed (in the hut zhanie violation of encapsulation ) .

2. Data should always be initialized .

The Java language does not require the initialization of local variables, but the fields in objects must be initialized. Not worth polagat s with me to the default settings, it is desirable initializes acce variables explicitly by constructors.

3. Not worth ispolz acce classroom too many basic types.

Several related fields of basic types should be combined into a new class. Such classes are easier to understand and modify. For example, the four basic types of fields in the Customer class

private String street ;

private String city;

private String state;

private int zip;

should be merged into a new class Address . This makes it easier to change addresses.

4. Not all fields need to have individual access and modification methods.

Quite often, objects contain fields that no one else accesses or changes their content. Such objects , for example, include the array of US state abbreviations in the Address class .

5. The standard form of class definition should be used .

The contents of a class is always listed in the following order (from The Style of programming in the Java , passed in the company of Sun Microsystems ) :

fields;

static fields ;

constructors ;

methods;

static methods .

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