Write in front
As a job seeker who has experienced many interviews and an interviewer who has interviewed many job seekers, he knows the importance of Java basics and core principles, and its importance even exceeds your technical ability. I'm not here to preach that technical ability is not important. Technical ability is the primary productivity of an enterprise, and it is the value of the boss in hiring you. But as an interviewer, be aware that when you talk about a tool you have used, the interviewer may not resonate with it, because he may not be familiar with the tool at all—especially the last company you worked for and the current applicant This company is in a different background. But if you don't answer well about the core Java stuff, then the interviewer has enough reason to think you can't.
As a developer with more than ten years of Java programming experience, I deeply understand the importance of having a solid basic knowledge of Java for work. Some people may think that the framework is more important. Yes, the framework encapsulates many things programmers have to do, so that we can focus on enterprise business development, and can significantly improve development efficiency. The reason why Java has been at the top of the list of development languages for many years is that in addition to its various excellent language features, it is also inseparable from these excellent frameworks contributed by various open source communities. But for beginners, you should first pay attention to the basics and principles, and get started with the framework from the beginning. It is easy to ignore those basic knowledge. Many people think that Java Web development is SSH, and only need to copy a series of configuration files; many programmers have been working on Java Web for several years, but they can’t describe the life cycle of objects clearly and don’t understand why they use it. Spring management; there are still a small number of people who don’t even know which js or jsp program is executed on the server side and which is executed on the client side. Many jokes that are expected to pop up on the client side are popped up on the server side... …These are the results of getting started from the beginning and not focusing on basic learning. It can be said that "the success is the framework, the failure is the framework".
Performance is an issue that architects consider all the time. As an in-service architect, in addition to the grasp of system-level design, I am most concerned about performance optimization at the algorithm and code level, because this is the foundation of our system. Although I don't write business code anymore, I still do some basic code by myself, and I like to use some tools or write scripts to test its performance; it is one of my daily tasks to develop development specifications and code reviews for team members. Don't build a high platform on the floating sand. The basic code foundation is not well laid. What about big data and high concurrency?
Java core technology for busy people
Today, I recommend this book "Java Core Technology for Busy People" to those who are looking for a job in Java development, and throw away those cookie-cutter interview questions on the Internet. This book can save you time and review it quickly. I also recommend this book to Java programmers, technical managers, and architects-in short, the incumbents who have not completely separated from development, do not need to deliberately read it through, put it on the desk, and use Java to implement a certain function At the time, look at the relevant introduction on this book-you will find that the program can be written this way, and it is actually better to write this way.
Introduction
Java has been born for about twenty years. The first and second volumes of the classic book Core Java ("Java Core Technology") use more than two thousand pages to introduce the Java language and all core libraries in detail, as well as a large number of versions Variety. But Java 8 changed all of this. Many old Java idioms are no longer needed, and there is a faster and more convenient way to learn Java. In this book, we will show the "good places" in modern Java so that you can quickly apply them to your work.
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Chapter 1 Basic Programming Structure
In this chapter, you will learn the basic data types and control structures of the Java language.
Chapter 2 Object Oriented Programming
In this chapter, you will learn how to implement your own classes and methods.
Chapter 3 Interfaces and lambda expressions
In this chapter, you will learn about interfaces and lambda expressions.
Chapter 4 Inheritance and Reflection
In this chapter, you will learn another basic concept of object-oriented programming: inheritance
Chapter 5 Exceptions, Assertions, and Log Handling
In this chapter, you will see how to use the log API in the program to record different events (regardless of common or suspicious)
Chapter 6 Generic Programming
Chapter 7 Collection
This chapter will explain how to use lists, collections, maps, and other collections.
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Chapter 8 Stream
Chapter 9 Input and Output Processing
In this chapter, we will learn how to manipulate files, directories and web pages, and how to read and write data in binary and text mode. This chapter will also introduce regular expressions useful for processing input
Chapter 10 Concurrent Programming
Chapter 11 Notes
In this chapter, you will learn the details of annotation syntax, how to define your own annotations, and how to write annotation processors that work at the code level or at runtime.
Chapter 12 Date and Time API
Chapter 13 Internationalization
This chapter will introduce how to use Java's internationalization function to help our program display and receive information in the way the user is located (regardless of where these users are).
Chapter 14 Compilation and Scripting
In this chapter, you will learn how to use the compiler API to compile Java code from within the program. You will also learn how to use the scripting API and how to run programs written in other languages from Java programs. This chapter is very useful if you want users to have the ability to use script extensions to enhance program functions.
Whether you are a newbie or an experienced veteran who just started using Java, this book is of inestimable value for anyone who wants to write very robust, efficient and safe Java code. Whether you are a novice or an experienced veteran who just started using Java, this book is of inestimable value for anyone who wants to write very robust, efficient, and safe Java code.