"Data Structures Using Java" Tsinghua University Press, D. S. Malik & P.S.NAIR, Yang Hao. This book is very good. I will study her carefully. Today, the first chapter ---- Software Engineering Basic Principle and Java Class
1: The software is a program running on a computer.
2: Otherwhere in mind to no longer use, in which a number of phases are experienced: this is the so-called software life cycle
3: Three basic stages of the software life cycle are: development phase, use phase and maintenance phase
4: Software creates in the development phase
5: In the software maintenance phase, you need to modify the errors in the software and enhance its function.
6: If the new version is no longer released, the software will gradually stop using it.
7: Demand analysis, design, implementation, testing, and debugging in the software development phase.
8: In the design phase, you need to design the algorithm, solve the problem.
9: Algorithm is a process of gradually solving problems in a limited time
10: Two famous design technologies are: structured design and object-oriented design
11: In structured design, the problem will be broken down into a sub-problem. When the child problem is solved, all sub-problems have been solved by the original problem.
12: In object-oriented design, the program is a collection of interactive objects.
13: Objects consist of data and operations on data.
14: Three basic principles for object-oriented design are: encapsulation, inheritance, polymorphism
15: In the implementation phase, you need to write and compile the code to achieve classes and methods in the design phase.
16: The front condition refers to the conditions that must be satisfied before the call function.
17: Conditions that must be met after the function call is completed
18: In the test phase, you want to test the correctness of the program to ensure that the program completes the task.
19: Debug is to find out and fix errors in the program.
20: Find the error in the program through a series of test cases.
21: Test cases include input information, user actions, or other initial conditions, as well as the desired output result.
22: There are two methods for testing: black box testing and white box testing.
23: When the algorithm analysis is performed, the number of operations to be performed is often required.
24: Set F is a function of n, the progressiveness is when the N infinity increases when F changes.
25: Class is a collection of fixed quantities components.
26: The class of the class is called a member of the class.
27: The member of the class is accessed by name.
28: In Java, Class is a reserved word.
29: Members of the class are divided into three categories: public, private, protected
30: Private members cannot access external access.
31: Public members can access outside of class.
32: By default: members of the class are private.
33: Members of the class can be methods or variables
34: If a class member is a variable, a declared method is similar to a declarative normal variable.
35: In Java, the class is a definition
36: Members of the class are called example methods.
37: Constructor ensures initialization of data when statement
38: The constructor is automatically performed when the class object is in its scope.
39: In shallow relics, two or more references to the same type points to the same object.
40: In deep relics, each reference variable points to its own object.
41: The scope of the reference variable is the same as the other variables. 42: The role of class members is partial.
43: The copy constructor is executed when an existing object instantial and initialization object is used.
44: Method toString is a public method with return values, it does not have parameters, returns the address of the String object
45: Method Print and Println Output Strings created by method toString
46: Method TOSTRING's default default creates a string, which contains the class name of the object and the hash code of the object.
47: When the class object exceeds the scope, the destructor is automatically executed.
48: A class has only one destructor, and there is no parameters.
49: The name of the destructor is Finalize.
50: You can create your own packages using the package statement
51: Java Implicit Use Reference this to represent the instance variables and methods of the class.
52: Class defined in another class is called an internal class.
52: If a data type indicates the logical properties, there is no specific implementation process, it is called an abstract data type.
