Master Java 5.0 and TDD Together: Build More Robust, Professional Software

Master Java 5.0, object-oriented design, and Test-Driven Development (TDD) by learning them together. Agile Java weaves all three into a single coherent approach to building professional, robust software systems. Jeff Langr shows exactly how Java and TDD integrate throughout the entire development lifecycle, helping you leverage today's fastest, most efficient development techniques from the very outset.

Langr writes for every programmer, even those with little or no experience with Java, object-oriented development, or agile methods. He shows how to translate oral requirements into practical tests, and then how to use those tests to create reliable, high-performance Java code that solves real problems. Agile Java doesn't just teach the core features of the Java language: it presents coded test examples for each of them. This TDD-centered approach doesn't just lead to better code: it provides powerful feedback that will help you learn Java far more rapidly. The use of TDD as a learning mechanism is a landmark departure from conventional teaching techniques.

• Presents an expert overview of TDD and agile programming techniques from the Java developer's perspective

• Brings together practical best practices for Java, TDD, and OO design

• Walks through setting up Java 5.0 and writing your first program

• Covers all the basics, including strings, packages, and more

• Simplifies object-oriented concepts, including classes, interfaces, polymorphism, and inheritance

• Contains detailed chapters on exceptions and logging, math, I/O, reflection, multithreading, and Swing

• Offers seamlessly-integrated explanations of Java 5.0's key innovations, from generics to annotations

• Shows how TDD impacts system design, and vice versa

• Complements any agile or traditional methodology, including Extreme Programming (XP)

E文不算太难，一般都应该可以看懂，为什么好书都是老外写的呢？
我想把书传上来，但是.Text对文件的大小好象是有限制，书的名字叫
Agile Java Crafting Code with Test-Driven Development，想要的同学可以留下EMAIL

一、 用构造函数初始化

1．1、   函数的签名和返回值

构造函数可以通过不同的函数签名来进行重载。构造函数没有返回值，这和返回值为 void 的是不同的

1．2、   构造函数的重载

如何区分构造函数的不同呢，用不同的函数签名。函数签名的顺序不同都可以，但是这样的编程风格是不好的。

函数的签名会上升转型（当没有合适的函数签名出现的时候），但是不会窄化转型，你必须要显示的进行强制类型转换。

不能以 return value 的不同作为重载的标准。

当程序提供了构造函数以后，系统就不在提供默认的构造函数了。

This 关键字指的是当前对象，有了 this 后，可以在构造函数中以如下的方式调用

Class A  {
    A ()  {…}
    A( int  a, char  b)  {… }
    A( int  a, char  b, float  c)  {
        This(a,b);  // 注意：只能调用一次
    }
}

1．3、   Static 的含义

你无法在 static 函数中调用 non-static 函数，但是你可以在 non-static 中调用 static 函数。

二、 类的清理

JAVA 的垃圾回收机制只能回收 new 出来的对象，但是你的对象不是 new 出来的而获得的“特殊”内存，那么 JAVA 的垃圾回收就不能处理，这样就必须用 finalize() 函数来释放你的“特殊”内存。

JAVA 的清理方式是先调用你的 finalize() ，然后在下次垃圾回收的时候来清理你的“特殊”内存。

关键的三句话：

垃圾回收不等于析构；

你的对象可能不被回收；

垃圾回收动作只回收内存。

用 System.gc() 可以用来强迫终结动作的发生