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java object-oriented - encapsulation

This article is recommended to everyone by the java language introduction column. Everyone is welcome to come to this column to learn relevant knowledge. Encapsulation in Java can be thought of as a protective barrier that prevents certain types of code and data from being accessed at will by other classes. To access the data of this type, you must use a specified method.

Nov 28, 2019 pm 02:12 PM

java encapsulation object-oriented

Difference between methods of creating files in java

This article introduces you to the differences between methods of creating files. You are welcome to learn more knowledge by visiting the Java Programming Introduction column. "mkdir" can only be used to create folders, and only one-level directories; "mkdirs" can also only be used to create folders, but it can create multi-level directories. If the upper level does not exist, it will be created automatically.

Nov 28, 2019 pm 01:57 PM

java create the difference document method

There is a detailed introduction to the operation of jar packages in java

This article is recommended to everyone by the java entry column. You can come to this column to communicate and learn together. The ".class" file generated after the ".java" file is compiled is packaged and becomes a jar package in java. The jar package can also contain some resource files, such as txt files, html files, css files, etc.

Nov 28, 2019 pm 01:30 PM

jar package java

How to compile and run java files in the console

The method of compiling and running "java" files in the console is: first open the console, run the "javac" command to check whether the configuration environment is correct, if not, configure the environment, then run the "javac file name" command to compile, and finally run " java file name" to compile and run.

Nov 28, 2019 am 11:35 AM

java console document

The difference between constructor methods and ordinary methods in java methods

The difference between the constructor method in the "java" method and the ordinary method is: 1. The name of the constructor method must be exactly the same as the class name in which it is defined; 2. The constructor method is automatically executed when initializing the object; 3. The constructor method can be overloaded ; 4. The construction method cannot be modified by keywords such as "static".

Nov 28, 2019 am 10:25 AM

java the difference Construction method

Learn more about Java generics

Generics, that is, "parameterized types". It is to parameterize the original specific type, similar to the variable parameters in the method. At this time, the type is also defined as a parameter form (which can be called a type parameter), and then the specific type (type actual parameter) is passed in when using/calling ).

Nov 27, 2019 pm 06:11 PM

java Generics

Java object serialization and deserialization

Object serialization is to convert the Object object into a byte sequence, and vice versa is called deserialization of the object. The object must implement the serialization interface before it can be serialized, otherwise an exception will occur.

Nov 27, 2019 pm 05:59 PM

I流 java Deserialization object Serialization

Detailed explanation of map and flatMap operations in Java8 Stream Api

Java 8 provides a very easy-to-use Stream API, which can easily operate collections. Today we will discuss two Stream intermediate operations map(Function<? super T, ? extends R> mapper) and flatMap(Function<? super T, ? extends Stream<? extends R>> mapper)

Nov 27, 2019 pm 05:50 PM

flatMap java map

A brief discussion on the differences between String, StringBuffer and StringBuilder

In Java development interviews, we are often asked about the differences between String, StringBuider, and StringBuffer. Many people do not answer comprehensively and in-depth enough, so what are the differences between them?

Nov 27, 2019 pm 05:15 PM

java string stringbuffer stringbuilder

Annotations for java basics

This article introduces annotations in Java from the Java introductory learning column, hoping to help students in need. Meta-annotations are used to specify where the annotations can be used. For example: @Target(ElementType.METHOD) means that it can be used on methods, but other structures cannot be used.

Nov 27, 2019 pm 04:51 PM

java annotation

Detailed explanation of various usages of Static, final, and Static final in Java

Are you familiar or unfamiliar with the keywords Static, final, and Static final? Want to say something but don’t know how to say it accurately? Okay, this article will briefly outline their respective uses.

Nov 27, 2019 pm 04:50 PM

final java static

In-depth understanding of abstract classes and interfaces in Java

I believe everyone has this feeling: abstract classes and interfaces have too many similarities and too many differences. These two often make beginners confused. Whether in actual programming or during interviews, abstract classes and interfaces are particularly important!

Nov 27, 2019 pm 04:43 PM

java abstract class interface

What is floating point type? Introduction to single-precision floating-point numbers (float) and double-precision floating-point numbers (double)

As a Java learner, how can I not understand the basics of these Java basics? This article will take you through Java floating point types, single precision floating point numbers, and double precision floating point numbers.

Nov 27, 2019 pm 04:34 PM

double float java floating point

Detailed introduction to java generics

This article introduces Java generics in detail to everyone in the Java language introduction column. I hope that students who do not understand this can read this article carefully. Generics provide a compile-time type safety detection mechanism, which allows programmers to detect illegal types at compile time.

Nov 27, 2019 pm 04:30 PM

java Generics