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Java tutorial
  • Development of jcrop web screenshot tool (plug-in)

    Development of jcrop web screenshot tool (plug-in)

    Today I will introduce to you a screenshot (such as avatar, etc.) tool that is often used in the web: Jcrop Demonstration project structure: Rendering: This is very useful: After seeing these, everyone wants to try it yourself ===== ======================
    2024-11-17
  • AndroidHttpClient uses Cookie application analysis

    AndroidHttpClient uses Cookie application analysis

    Today I want to port an automatic check-in applet using HttpClient to Android. Fortunately, the Android SDK comes with the HttpClient package. When looking through the Android documentation, I found that the official also provides an AndroidHttpClient tha
    2024-11-17
  • Java object-oriented basics_final detailed introduction

    Java object-oriented basics_final detailed introduction

    final: Disadvantages of inheritance: It breaks the encapsulation of the code. The emergence of final just makes up for this disadvantage. The final keyword: 1-final is a modifier that can modify classes, methods, and variables; 2-final modified classes ca
    2024-11-17
  • hadoop stand-alone installation and configuration tutorial

    hadoop stand-alone installation and configuration tutorial

    Stand-alone installation is mainly used for program logic debugging. The installation steps are basically distributed installation, including environment variables, main Hadoop configuration files, SSH configuration, etc. The main difference lies in the c
    2024-11-17
  • Detailed introduction to private fields and methods of Java reflection

    Detailed introduction to private fields and methods of Java reflection

    Although we usually think that it is feasible to access private fields and private methods of other classes through JAVA's reflection mechanism, it is not that difficult. Note: This code will only work if you run it in a separate JAVA program, like yo
    2024-11-17
  • In-depth understanding of java recursion

    In-depth understanding of java recursion

    1. Recursive function, in layman’s terms means that the function itself calls itself...such as: n!=n(n-1)! You define the function f(n)=nf(n-1) and f(n-1) It's this defined function again. . This is recursion. 2. Why recursion is used: The purpose of
    2024-11-17
  • Binary search tree example exercises

    Binary search tree example exercises

    A binary search tree is organized according to the binary tree structure. Such a tree can be represented by a linked list structure, where each node is an object. In addition to data, the node also includes the fields left, right and p, which point to the
    2024-11-17
  • bool misunderstood as function parameter

    bool misunderstood as function parameter

    We have many Coding Styles or coding specifications. But this item may often be forgotten by us, that is, we often use bool parameters in function parameters, which will greatly reduce the readability of the code. Don’t believe it? Let's first look at
    2024-11-17
  • How to implement the java string to date method

    How to implement the java string to date method

    Just return the String type to JSON and format it twice. For example: Java code copy code is as follows: String s = "2012-08-25"; SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd"); SimpleDateFormat sdf2 = new SimpleDateFormat(
    2024-11-17
  • Detailed introduction to common methods of java string class

    Detailed introduction to common methods of java string class

    String: String type 1. Constructor copy code The code is as follows: String(byte[] bytes): Construct a string object through a byte array. String(char[ ] value): Construct a string object from a char array. String(Sting original): Construct a copy of orig
    2024-11-17
  • Detailed introduction to the syntactic differences between java and c#

    Detailed introduction to the syntactic differences between java and c#

    I have been switching from C# to Java for a while. I would like to summarize what I think is the difference between the syntax of Java and C#. If you have any different opinions, I would like to ask everyone. When Haihan first learned Java, he felt that t
    2024-11-17
  • Java collection framework architecture details

    Java collection framework architecture details

    Recently, I saw a very good description of the collection framework in a J2EE book. I filtered it and posted it to share with everyone. The collection framework provides interfaces and classes for managing object collections. It includes interfaces, class
    2024-11-17
  • How to implement HTTP breakpoint resume function in Java

    How to implement HTTP breakpoint resume function in Java

    (1) Principle of resumed downloading In fact, the principle of resumed downloading is very simple, that is, the HTTP request is different from the general download. For example, when the browser requests a file on the server, the request issued is as foll
    2024-11-17
  • Introduction to java's reading and writing operations on files in a specified directory

    Introduction to java's reading and writing operations on files in a specified directory

    Recently, due to the need for internationalization of the project, it is necessary to internationalize about 100 plug-ins in the entire project. This is a painful thing because it is purely manual labor. In order to save some work, I thought about writing
    2024-11-17
  • A brief analysis of the exception handling mechanism in java multithreading

    A brief analysis of the exception handling mechanism in java multithreading

    In a Java multi-threaded program, all threads are not allowed to throw uncaught checked exceptions, which means that each thread needs to handle its own checked exceptions. This is constrained by the java.lang.Runnable.run() method declaration (because th
    2024-11-17
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