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Java tutorial
  • Java reflection learning getClass() function application

    Java reflection learning getClass() function application

    Java reflection learning The so-called reflection can be understood as the operation of obtaining object type information during runtime. Traditional programming methods require programmers to decide the types to use at the compile stage, but with the hel
    2024-11-17
  • How to implement full-width and half-width character conversion in java

    How to implement full-width and half-width character conversion in java

    Copy the code as follows: package com.whatycms.common.util; import org.apache.commons.lang.StringUtils; /** * <PRE> * Provides full-width -> half-width, half-width -> full-width conversion for strings * < /PRE> */ public class BCConvert
    2024-11-17
  • Java implements mutual conversion between IP address and decimal number

    Java implements mutual conversion between IP address and decimal number

    First look at the example code as follows. Copy the code as follows: classip { privatestaticlongiptolong(stringstrip) //Convert the ip address in the form of 127.0.0.1 into a decimal integer. No error handling is performed here { intj=0; inti=0; long[ ]ip
    2024-11-17
  • Detailed explanation of how to use java this super

    Detailed explanation of how to use java this super

    super is a reserved word in the Java language, used to point to the super class of a class. Assume that a class variable boolean gender is defined in the Teacher class; in the method of the subclass, gender should refer to the gender variable of the subcl
    2024-11-17
  • In-depth analysis of the use of pseudo-static technology in Java UrlRewriter

    In-depth analysis of the use of pseudo-static technology in Java UrlRewriter

    Usually, in order to better relieve server pressure and enhance search engine friendliness, we generate static pages from article content. But sometimes in order to display some information in real time, or to use dynamic scripts to solve some problems, w
    2024-11-17
  • Detailed explanation of usage of java equals function

    Detailed explanation of usage of java equals function

    The equals function has been defined in the base class object. The source code is as follows. Copy the code as follows: public boolean equals(Object obj) { return (this == obj); } It can be seen from the source code that the default equals() method is the
    2024-11-17
  • eclipse error eclipse startup error solution

    eclipse error eclipse startup error solution

    One of the errors reported: Version 1.4.2_03 of the JVM not suitable for this product.Version1.5 or geeater is required. It probably means that the environment of my JVM virtual machine is too low. Version 1.4 is too low. I am asked to use version 1.5 or
    2024-11-17
  • Detailed analysis of the difference between java abstract classes and interfaces

    Detailed analysis of the difference between java abstract classes and interfaces

    abstractclass and interface are two mechanisms in the Java language that support abstract class definitions. It is precisely because of the existence of these two mechanisms that Java is given powerful object-oriented capabilities. There are great similar
    2024-11-17
  • In-depth understanding of java encryption techniques

    In-depth understanding of java encryption techniques

    ★ Programming ideas: The MessageDigest class in the java.security package provides a method for calculating message digests. First, generate an object, execute its update() method to pass the original data to the object, and then execute its digest() meth
    2024-11-17
  • Java sqlserver text type field reading method

    Java sqlserver text type field reading method

    There is a need to transfer documents originally stored in the database to the file system, so I wrote a simple program to complete this function. The code is as follows: Java code copy code code is as follows: import java.io.BufferedOutputStream; import
    2024-11-17
  • Brief analysis of java anonymous inner class instances

    Brief analysis of java anonymous inner class instances

    Anonymous classes are classes that cannot have names, so there is no way to reference them. They must be declared as part of the new statement at creation time. This requires another form of new statement, as follows: new <class or interface> <bo
    2024-11-17
  • Spring transaction management only rolls back runtime exceptions.

    Spring transaction management only rolls back runtime exceptions.

    1. Conclusion Spring's transaction management only rolls back runtime exceptions (java.lang.RuntimeException and its subclasses) by default. If a method throws an Exception or Checked exception, Spring transaction management does not perform rollback
    2024-11-17
  • Introduction to the differences between java abstract class interface

    Introduction to the differences between java abstract class interface

    A class containing the abstract modifier is an abstract class, and an abstract class cannot create instance objects. Classes containing abstract methods must be defined as abstract class, and methods in abstract class classes do not have to be abstract. A
    2024-11-17
  • Analysis of the difference between Java overload and override

    Analysis of the difference between Java overload and override

    Method overriding and overloading are different manifestations of Java polymorphism. Overriding is a manifestation of polymorphism between parent and subclasses, while overloading is a manifestation of polymorphism in a class. If a method defined in a sub
    2024-11-17
  • How to implement hibernate named query

    How to implement hibernate named query

    What is a named query? Hibernate allows you to define query statements in the form of strings in the mapping file. This query method becomes a named query. What are the benefits of using named queries? Since using Hibernate's HQL often requires writin
    2024-11-17
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