良子

第三章: Controlling Program Flow1、Mathematical operators(数学运算符) addition (+), subtraction (-), division (/), multiplication (*) and modulus (%, which produces the remainder from integer division). Intege

第十一章: Collections of Objects数组部分               the Java utilities library has a reasonably complete set of container classes1、Arrays                    There are three issues that distinguish arrays f

第十章: Detecting Typesrun-time type identification (RTTI) 运行时类型识别-- It lets you find the exact type of an object when you have only a reference to the base type. This takes two forms: “Traditional” RTTI

9）Map functionalityMap (interface)Maintains key-value associations (pairs) so you can look up a value using a key.HashMap*Implementation based on a hash table. (Use this instead of Hashtable.) Provide

第八章: Interfaces & Inner Classes       1、 Interfaces interface Instrument {   // Compile-time constant:   int I = 5; // static & final   // Cannot have method definitions:  

第四章: Initialization & Cleanup： 1、Guaranteed initialization with the constructor the coding style of making the first letter of all methods lowercase does not apply to constructors, since t

第二章: Everything is an Object：1、Where storage lives:Registers. The stack. The heap. Static storage.  Constant storage.  Non-RAM storage. 2、Special case: primitive typesPrimitive typeSizeMinimumMaximumW

第一章: Introduction to Objects：1、a pure approach to object-oriented programming:Everything is an object. A program is a bunch of objects telling each other what to do by sending messages.Each object has

第九章: Error Handling with Exceptions-- badly formed code will not be run当发生异常的时侯，它会跳出当前的运行环境，把问题交给上一层运行环境。另外异常机制让程序的执行代码和错误处理代码分离，增强了程序的可读性和维护性。1、  Basic exceptions                    if(t == null)    

第七章: Polymorphism1、  Upcasting revisited--Taking an object reference and treating it as a reference to its base type.(通过绑定来实现多态的方法调用)Method-call binding方法调用的绑定，分前绑定和后绑定--early binding(When binding is

第六章: Reusing Classesuse the classes without soiling the existing code—composition and inheritance(合成与继承—has a 与is a )     1、  Inheritance     class Cleanser { public vo

第五章: Hiding the Implementation：1、package: the library unitpackage mypackage;Note that the convention for Java package names is to use all lowercase letters, even for intermediate words.Creating unique

3）Introduction to containers       The Java 2 container library takes the issue of “holding your objects” and      divides it into two distinct concepts: a、  Collection: a group of individual elements