java programming interviews exposed

to be exposed, and the corresponding fields themselves are mutable (such as HashMap), then the method to return these fields requires a defensive copy to prevent external code from modifying its internal state. As shown in the Getroutemap method in the code in Listing 4.SummarizeThis article describes the intent and architecture of the immutable object mode. and combined with the author's work experience provides a practical case to demonstrate the u

Java concurrent programming: the usage and principle of volatile, javavolatile Java concurrent programming series [unfinished ]: Java concurrent programming: core Theory Java concurr

how to install the Java SDK (JDK), and how to compile and run different types of programs, because it was just exposed to this course, So in the process of reading is still a lot of professional terminology is not particularly understandable, perhaps it will be a lot better to try it again. We must note before the experiment: the class name must pay attention to the case, such as welcome, when compiling th

page is displayed. The downside is that our code is all exposed to people.(1.3) Java: The problem of client-side programming is cleverly addressed through a "tablet" (applet).(1.4) ActiveX: Microsoft's, also specific cross-platform use capabilities(1.5) Security: GIF files do not pose any harm to us, and scripting languages often have a big limit on what you can

Design Patterns of gof. It seems that they have become a popular style to learn about gof at school or in the workplace. I don't want to list the 23 DesignsPattern,My original intention of writing this is to talk about my own experiences and opinions, hoping to help you understand them.First of all, I think the design pattern is only a general solution to a type of problem. As long as it is object-oriented programming predictions, these 23 kinds can

, Java will return an error in the compilation, telling you that the variable is not initialized.2.6 Building a Java programStatic keyword:The following two scenarios require the use of static Just want to allocate a single storage space for a particular domain, without thinking about how many objects to create. A method is not associated with any object that contains its class, or it can be c

need to occupy CPU and only with resources such as I/o,oembios, so that other threads that need to occupy CPU resources have access to CPU resources. Fundamentally, this is the ultimate goal of multithreaded programming. [The first question to be clarified] As with the difference between programs and processes, to master multithreaded programming, the first thing to understand is the difference between t

This article was first published by Huang Wenhai in the Infoq Chinese station: Http://www.infoq.com/cn/articles/Java-multithreaded-programming-mode-active-object-part1. Reprint Please specify the author: Huang Wenhai Source:http://viscent.iteye.com. Introduction to Active Object Mode Active Object mode is an asynchronous programming pattern. It improves concurre

Moment of ReflectionJava Basic framework of learning, a variety of basic grammar points of learning,OO style programming basic ideas of learning and so we have done, this week's study we really went into the JAVA Another big PLATE: The graphical user interface. formerly in pythonthis week's JAVA Learning We also review the first chapter to the fourth chapt

easier, but it is difficult to adjust their performance. Unfortunately, using the socket abstraction of Java makes the stream the only choice. Buffer abstraction represents a limited data container, which is essentially an array with pointers indicating where data is stored and where data is read. Buffer has two advantages: first, the system overhead associated with read/write buffer data is exposed to pr

grandfather{ private static int i = Print (); private static int print () { System.out.println ("f"); return 1;} } public class Son extends father{ private static int i = Print (); private static int print () { System.out.println ("s"); return 1; } public static void main (string[] Args) { System.out.println ("first");} }Is the result of printing first? Wrong. Although the Main method is Running. But see son this I need static initializ

whether it is final. The 7) class member method is only intended for internal invocation of the class and must be private. The 8) class member method is only exposed to the inheriting class, and is limited to protected. description: Any class, method, parameter, variable, strict access to the scope. A wide range of access is not conducive to module decoupling. Think test: If it is a private method, you want to delete it, but a public servic

at the beginning of Java programming, we were exposed to Java threads, and then the code was summed up, but now it seems a bit flawed, and there is no thread to explain the origin of the problem, but simply describes what is the process, what is the thread, and the relationship between them-"

space, so they have the same value.Static acts on a method, except that the usage can invoke it without creating any objects, class. Method ().2.9 Coding StyleHump Style: class, with uppercase letters in the first letter of each word Methods, fields, and objects, the first letter in lowercase, the remaining first letter capitalized Summarize:This chapter is easy to understand, the Java language and some of its basic ideas have a gen

Fundamentals of Java Programming (i)1. Java Basic Syntax1.1 Java Basic formatModifier Class class Name {Program code} Java is strictly case-sensitive, such as the class keyword cannot be written as class, and the Java com

statements.1. Write sleep (10*1000) directly.2. Define a constant timeout_xxx = 10*1000; then sleep (timeout_xxx );3. Add a timeout item to the preparation file, then the program reads the configuration file to obtain the timeout value, and then calls sleep. (Configuration FileIn a broad sense, it refers to various mechanisms that can be used to store configuration information, such as XML files and databases)If your approach is similar to writing 1, you may prefer hard coding. Hard coding is n

1. Generic Programming generic programming means that the code you write can be reused by many different types of objects. For example, you do not want to design separate classes for aggregating string and integer objects. (I think this is what I'm saying here.) Create an object that can be of type string and integer. But have the same behavior or attributes) The code is as follows: Public class stringt

This week we have been exposed to the Java object-oriented content, it is really difficult to tell the truth, a variety of new terms appear, and the relationship between the different words. Object-oriented programming and process-oriented programming have a great difference, to learn to change in thinking. This week,

Interface ImplementationWhat is a data type? in Java, the data and methods are wrapped in a class, and the result is a data type that hides the specific implementation. (Encapsulation produces data types)Lenovo to the eight basic data types, all have the above characteristics.Because of the above characteristics of the data type, the creator divides the boundary of the permission within the data type, separates the data and methods that want to be acc

Introduced As we all know, AOP (facet-oriented programming) is one of the features of the spring framework. AOP provides extremely high scalability by setting crosscutting concerns (cross cutting concerns). So how does AOP work in spring? When you can only use core Java, but you need AOP technology, the answer to this question becomes extremely critical. Not only that, but in