popular programming languages 2017

This week through the teacher's classroom explanation and the vacation study, the knowledge Point summarizes as follows:1. A callback can indicate the action that should be taken when a particular event occurs.Take the construction timer as an example:In many programming languages, a function name can be provided, and the timer calls it periodically. However, classes in the Java Standard Class library take

20165237 2017-2018-2 "Java Program Design" 3rd week Study summary Textbook study summary1. For machine languages: classes such as assembly language.2. Process-oriented languages: classes such as C (but equivalent to the lack of a subject in speech).3. Object-Oriented languages: classes such as C + + or java.4. class =

subclass overrides the member method with the same name as the parent class. If you want to access a member method of the same name in the parent class in a subclass, you need to use the Super keyword to refer to it.Note: Hiding and overwriting are different. Shadowing is for member variables and static methods, and overrides are for common methods.Subclasses are constructors that cannot inherit the parent class, but note that if the constructor of the parent class is parameterized, the constru

Abstract window Toolbox (Toolkit, AWT) contains many of the component classes and container classes used to design the GUI in the java.awt package The position and size of a component in a container (such as JFrame) is determined by the layout manager. All the containers will Use a layout manager to automate the layout management of components. Develop GUI program steps (Capture online experience) 1. Inheriting jframe (class inheritance)2. Define Required components (member vari

④populateA. ①③B. ①④C. ②③D. ②④Correct answer: CParsing: The populate method can only be used to write data2. The following data manipulation languages areA. InsertB. UpdateC. CreateD. SelectCorrect answer: A BMy answer: A B DAnalysis: I do not understand why there is no D, according to the Baidu Encyclopedia on the definition of data manipulation language, select should also belong to the operating language ah?Learning progress bar

"Java2 Practical Course (Fifth Edition)" Learning Guide Learning progress Bar lines of code (new/cumulative) Blog Volume (Add/accumulate) Learning Time (new/cumulative) Important Growth Goal 5000 rows 30 Articles 400 hours First week 36/36 4/4 30/30 Second week 464/500 1/5 18/48 Third week 832/1332 2/7 07n6

20165218 2017-2018-2 "Java program design" the first week to summarize the contents of the study summary of the first chapter. Getting Started with Java 1. Java featuresJava has a simple, object-oriented, platform-independent, multi-threading, dynamic and other characteristics, platform-independent is the most important feature to make it popular all over the world. platform independent refers to the same J

Learning progress Bar lines of code (new/cumulative) Blog Volume (Add/accumulate) Learning Time (new/cumulative) Important Growth Goal 5000 rows 30 Articles 400 hours First week 200/200 1/4 10/10 Second week 300/500 1/5 10/20 Third week 800/1300 1/6 20/40 Week Four 700/2000