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Java tutorial
  • The use of "==" and equals methods in java

    The use of "==" and equals methods in java

    Copy the code as follows: public class equalsDemo {public static void main(String[] args){/*When using == to determine whether two variables are equal, if the two variables are variables of basic data types, and both are numerical values The type is, then
    2024-11-18
  • The use of Java object initialization sequence

    The use of Java object initialization sequence

    Single class: (static member variables & static initialization block) < (member variables & initialization block) < constructor copy code code is as follows: public class object initialization sequence {public static void main(String[] args)
    2024-11-18
  • Analysis of the difference between instanceof and getClass() in java

    Analysis of the difference between instanceof and getClass() in java

    class A { } class B extends A { } Object o1 = new A(); Object o2 = new B(); o1 instanceof A => true o1 instanceof B => false o2 instanceof A => true // <================ HERE o2 instanceof B => true o1.getClass().equals(A.class) => true
    2024-11-18
  • javz notes: Interesting use of static methods

    javz notes: Interesting use of static methods

    Copy the code as follows: import java.util.*;public class welcome {public static void main(String[] args){/** Test 1: Methods can't modify numeric parameters*/System.out.println("Testing tripleValue:");double percent = 10;System.out.println(
    2024-11-18
  • Application introduction to the initialization process of Java class variables and member variables

    Application introduction to the initialization process of Java class variables and member variables

    1. Class initialization For class initialization: Class initialization is generally only initialized once, and class initialization mainly initializes static member variables. The compilation of a class determines the initialization process of the class.
    2024-11-18
  • Solution to path problem when loading resource files in Java

    Solution to path problem when loading resource files in Java

    There are two commonly used methods for loading resource files: 1. Using ClassLoader. Speaking of this, I have to mention the classification of ClassLoader. There are three main types of ClassLoader built into Java. The first one is the root class loader
    2024-11-18
  • The difference between String and StringBuilder in java

    The difference between String and StringBuilder in java

    I believe that everyone has a good understanding of the difference between String and StringBuffer, but it is estimated that there are still many comrades who are not clear about the working principles of these two classes. Today I will review this concep
    2024-11-18
  • Analysis of the problem of subclass calling parent class construction method in Java

    Analysis of the problem of subclass calling parent class construction method in Java

    In Java, during the construction process of a subclass, the constructor of its parent class must be called. This is because when an inheritance relationship exists, the subclass must inherit the contents of the parent class. By what means? The answer is a
    2024-11-18
  • In-depth analysis of Java regular expressions

    In-depth analysis of Java regular expressions

    1. regex (regular expression): RegularExpressions (replacing StringTokenizer); a powerful tool for string processing; popular in Unix, Perl is even better using regex. Mainly used in string matching, search and replacement. For example: matching IP (range
    2024-11-18
  • An introduction to custom annotations based on Java annotations

    An introduction to custom annotations based on Java annotations

    To learn annotations in depth, we must be able to define our own annotations and use them. Before defining our own annotations, we must understand the syntax of meta-annotations and related definition annotations provided by Java. ------------------------
    2024-11-18
  • Java automatic decompression file example code

    Java automatic decompression file example code

    Copy the code as follows: import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Enumeration; import java. util.zip.ZipEntry; import java.util.zip.ZipFile
    2024-11-18
  • Detailed explanation of basic concepts based on Java annotation

    Detailed explanation of basic concepts based on Java annotation

    What is annotation (Annotation): Annotation (annotation) is a way and method that Java provides for elements in a metaprogram to associate any information and any metadata (metadata). Annotation (annotation) is an interface. The program can obtain the Ann
    2024-11-18
  • Introduction to java JOptionPane class

    Introduction to java JOptionPane class

    1. Belongs to the javax.swing package. 2. Function: Customize four different types of standard dialog boxes. ConfirmDialog Confirmation dialog box. Ask a question, and then confirm it by the user himself (by pressing the "Yes" or "No"
    2024-11-18
  • Detailed explanation of the difference between int and Integer in Java

    Detailed explanation of the difference between int and Integer in Java

    1. Data types in Java are divided into basic data types and complex data types. Int is the former, and integer is the latter (that is, a class). 2. Copy the code during initialization as follows: int i = 1;Integer i = new Integer(1); // (treat integer as
    2024-11-18
  • Detailed explanation of the functions and differences of packaging jar, war, and ear packages based on Java

    Detailed explanation of the functions and differences of packaging jar, war, and ear packages based on Java

    From the end customer's point of view, the JAR file is a kind of encapsulation. They do not need to know how many .class files there are in the jar file. The functions and functions of each file can also get the results they want. In addition to jar,
    2024-11-18