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多态性是继数据抽象和继承之后的,面向对象的编程语言的第三个基本特 性。 它提供了另一个层面的接口与实现的分离,也就是说把做什么和怎么做分 开来。多态性不但能改善代码的结构,提高其可读性,而且能让你创建可 扩展的(extensible)程序。所谓“可扩展”是指,程序不仅在项目最初的 开发阶段能“成长”,而且还可以在需要添加新特性的时候“成长
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在面向对象的设计中,最关键的问题就是“将会变和不会变的东西分离开 来 这一点对类库尤为重要。类库的使用者(客户程序员)应该能完全仰赖类 库,他们知道,即使类库出了新版本,他们也不必重写代码。另一方面 类库的创建者也应该可以在确保不影响客户程序员代码的前提下,保留对 类库作修正和改进的权利 要达到上述目的,可以使用约定
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目标 1、JDBC简介 2、JDBC的类型 3、JDBC的组成部分和使用 4、PreparedStatement接口 5、 Callablestatement接口
文档格式:PPT 文档大小:194.5KB 文档页数:45
第3章面向对象的程序设计 3.1简介 3.2类 3.3对象 3.4实例研究(无) 3.5类的继承和类的多态性 3.6接口与包
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Chapter 0 Objectives After you have read and studied this chapter,you should be able to State briefly a history of computers. Name and describe four major components of the computer. Convert binary numbers to decimal numbers and vice versa. State the difference between the low-level and high-level programming languages
文档格式:PPT 文档大小:363.5KB 文档页数:33
Chapter 4 Objectives After you have read and studied this chapter, you should be able to Define an instantiable class with multiple methods and a constructor. Differentiate the local and instance variables. Define and use value-returning methods. Distinguish private and public methods. Distinguish private and public data members. Describe how the arguments are passed to the parameters in method definitions
文档格式:PPT 文档大小:351.5KB 文档页数:32
Chapter 6 Objectives After you have read and studied this chapter, you should be able to Implement selection control in a program using if statements. Implement selection control in a program using switch statements. Write boolean expressions using relational and boolean operators. Evaluate given boolean expressions correctly
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Chapter 8 Objectives After you have read and studied this chapter, you should be able to Declare and manipulate data of the char data type. Write string processing programs using String and StringBuffer objects. Differentiate the String and StringBuffer classes and use the correct class in solving given task. Distinguish the primitive and reference data types and show how the memory allocation between the two is different
文档格式:PPT 文档大小:304KB 文档页数:36
Chapter 7 Objectives After you have read and studied this chapter, you should be able to Implement repetition control in a program using while statements. Implement repetition control in a program using do- while statements. Implement repetition control in a program using for statements
文档格式:PPT 文档大小:214.5KB 文档页数:22
Chapter 1 Objectives After you have read and studied this chapter, you should be able to Name the basic components of object-oriented programming. Differentiate classes and objects. Differentiate class and instance methods. Differentiate class and instance data values
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