If you want to learn Java and have a high school degree, can you find a job?

Is it easy to find a job? The answer will be awkward because it involves too much. First, it depends on the degree of learning you need, and second, it depends on your learning ability. Everything is graded, and schooling is divided into primary school, middle school and university. Learning anything depends on learning ability (this is related to talent and interest, we will not break it down), otherwise why are there levels for various things, and various levels for academic qualifications... So is Java easy to learn? Having said that, it actually also talks about a learning stage issue.

A learning stage of Java

The first stage

Basic computer knowledge, common shortcut keys and common DOS commands. The history of the development of the Java language, the establishment of the Java development environment, experience the development of Java programs, the execution process of Java programs, common questions for beginners, the setting of environment variables path and classpath, and the introduction of Java decompilation tools. An introduction to commonly used computer systems of bases 2, 8, and 16, as well as the mutual conversion between them and decimal, signed data representation, original code, complement code, and complement code.

Java syntax format, keywords, identifiers, comments, data types, constants and variables, variable scope, data type conversion, operators, expressions. Program flow control statements and their application scenarios, functions and function overloading, arrays and common operations.

Project exercises and stage tests

Detailed explanations of classic problems such as narcissus, Pebonacci sequence, and data encryption.

The second stage

Object-oriented thinking, an overview of classes, the nature of objects, the relationship between classes and objects, and how to apply object-oriented thinking to solve problems in actual development.

How to design classes, basic principles of designing classes, and application of objects. Details of the class: member variables, constructor methods, member methods, private keyword, this keyword, static keyword, super keyword, final keyword. Anonymous objects, inner classes and the use of anonymous inner classes. Javadoc command production API.

The three major characteristics of object-oriented: encapsulation, inheritance and polymorphism, as well as the corresponding Java implementation. Analysis of the advantages and disadvantages of encapsulation, and the instantiation process of objects. Analysis of the advantages and disadvantages of inheritance, the instantiation process of subclass objects, and the rewriting of methods. Analysis of the advantages and disadvantages of polymorphism, and issues of upward transformation and downward transformation. Analysis of the advantages and disadvantages of abstract classes and interfaces, the difference between abstract classes and interfaces, and the application of abstract classes and interfaces in polymorphism. If you want to learn Java, you can come to this skirt. The first is 220, the middle is 142, and the last is 906. There are a lot of learning materials in it that can be downloaded.

The role of packages and the compilation and running of packaged programs, access to classes under different packages, the role and use of guided packages. The differences and common uses of the four access permission modifiers.

Project exercises and stage tests

Explanation of commonly used design patterns: singleton design pattern, simple factory pattern and factory method pattern, template design pattern. Help students better understand object-oriented thinking.

The third stage

Installation and use of Eclipse. Introduction to Java API, explanation of commonly used classes in API: String and StringBuffer, Math and Random classes, basic data type packaging classes, BigInteger and BigDecimal classes, System and Runtime classes, Date and DateFomat classes, and Calendar classes, Scanner and Timer, etc.

Java collection architecture, Collection, Iterator, List, ListIterator, ArrayList, Vector, Enumeration, LinkedList, Stack, Set, Hashset, TreeSet, LinkedHashSet, Map, HashMap, TreeMap, LinkedHashMap, Hashtable and other commonly used collections Common operations on interfaces and collection classes. Detailed analysis of the data structure of collections and the use of generics in collections.

Exceptions: origin of exceptions, exception system, exception handling methods, use of throws and throw keywords, multi-catch, how to use custom exceptions, etc.

IO concepts, File class, byte streams InputStream and OutputStream, character streams Reader and Writer, and corresponding implementation classes, IO performance analysis, byte and character conversion streams, the concept of packaging streams, and commonly used Explanation of packaging and decoration design patterns. Use of Properties. Analysis and explanation of computer coding problems. The use of IO streams under the Java NIO package.

Project exercises and stage tests

Detailed explanation of recursive algorithms, decorative design patterns, use of generics, enhanced for loops, variable parameters, static import and other features.

The fourth stage

The concept of multi-threading, how to create multi-threads (Thread, Runnable) in the program, thread safety issues, thread synchronization, deadlock issues, inter-thread communication Problems, explanations of producer-consumer issues, thread group and thread pool issues, and introduction to thread-related classes.

Java graphical user interface programming (AWT, Swing), graphical interface system, event listening mechanism and usage of common interface components.

Java network programming, network communication model, three major elements of network communication, and their corresponding Java implementation. DatagramSocket, DatagramPacket, ServerSocket, Socket programming. Use UDP protocol to complete a simple chat room program, use TCP protocol to implement a file upload server, and how a server can correspond to multiple clients.

The use of Java regular expressions, the String class, Pattern and Matcher classes support regular expressions.

Java’s advanced features: class loaders, reflection and proxies.

Project exercises and stage tests

Reappearance of common classic problems: producer and consumer issues, writing chat rooms, file upload servers, grabbing mailboxes in files, class loading Objects, reflections and agents.