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Java reads json data and solves Chinese garbled characters

Solution to Chinese garbled characters when reading json data in java: Use InputStreamReader when reading json data in java to use UTF-8 encoding to solve the garbled problem when the data is transferred from a byte stream to a character stream.

Dec 02, 2019 am 09:14 AM

java Garbled characters

Detailed graphic and text explanation of java constant pool

The constant pool in Java is actually divided into two forms: static constant pool and runtime constant pool. The static constant pool is the constant pool in the *.class file. The runtime constant pool means that after the jvm virtual machine completes the class loading operation, it loads the constant pool in the class file into the memory and saves it in the method area. .

Nov 30, 2019 pm 04:36 PM

java

Understand the concept of GC in JAVA in 3 minutes

GC (Garbage Collection) is an inevitable hurdle in the process of learning JVM. This article will introduce the basic concepts of gc in java. I hope it will be helpful to students learning java! In the JVM, the GC plays the role of a scavenger. It automatically collects garbage and determines memory allocation.

Nov 30, 2019 pm 04:36 PM

gc concept

Detailed explanation of Java memory model with pictures and text

The main goal of the Java memory model is to define the access rules for each variable in the program, that is, the low-level details of storing variables into memory and retrieving variables from memory in the virtual machine. The Java memory model stipulates that all variables are stored in main memory, and each thread has its own working memory.

Nov 30, 2019 pm 04:27 PM

java

Java implements dynamic initialization of arrays

This article introduces the method of dynamic initialization of arrays from the java introductory learning column. I hope it can help you. Dynamic initialization refers to specifying only the length of the array and giving the initialization value by the system. The format is: "data type [] array name = new data type [array length]".

Nov 30, 2019 pm 04:23 PM

java accomplish array

Three traversal methods of java collection ArrayList

This article introduces the three traversal methods of ArrayList from the java language introduction column. I hope it can help you. The three traversal methods of ArrayList are: 1. iterator traversal; 2. index value traversal; 3. for loop traversal.

Nov 30, 2019 pm 03:56 PM

arraylist java Traverse gather

Summary of usage of reference types in java

This article introduces the usage of reference types from the java introductory tutorial column. I hope it can help you. Usage 1: class as a member variable; Usage 2: interface as a member variable; Usage 3: interface as method parameter and return value type.

Nov 30, 2019 pm 03:31 PM

java reference type usage

Examples of how to handle exceptions in java

This article introduces to you the various methods of handling exceptions in Java from the java introductory column. I hope it can help you. There are two main ways to handle exceptions in Java: one is "try catch" and the other is "throws".

Nov 30, 2019 pm 03:15 PM

java Processing method abnormal

Analysis of the reasons why $ should not be used in Java classes

This article introduces to you the reasons why $ is not used in classes in Java. I hope it will be helpful to students learning Java. Java identifiers consist of letters, numbers, currency symbols (￥, $, etc.), and connection symbols (_, etc.). But sometimes when you use $ easily, you will get unexpected surprises.

Nov 30, 2019 pm 02:43 PM

java kind

Java file operation-get file or directory information

This article introduces how to obtain file or directory information from the Java Programming Introduction column. I hope it can help students in need. When obtaining file or directory information, you generally need to first determine whether the file or directory exists, and then use "isFile", "isDirectory" and other methods to make the corresponding determination.

Nov 30, 2019 pm 01:39 PM

java information document Table of contents Obtain

How to determine whether a multi-level path exists in java and create it if it does not exist

The way to determine whether a multi-level path exists in "java" and create it if it does not exist is: first segment the path by characters and save the result into an array, then instantiate the "StringBuffer" class, and then use the "if" statement to further determine, If the path does not exist, just create the directory.

Nov 30, 2019 pm 01:05 PM

java judgment exist

There are several ways to create objects in java

There are four ways to create objects in "java", which are: Method 1, use the "new" keyword to create objects; Method 2, use the reflection mechanism to create objects; Method 3, use the "clone" method to create objects; Method 4, Create objects using deserialization.

Nov 30, 2019 am 11:45 AM

java create object method

Solution to Chinese garbled java file name

Solution to Chinese garbled file names in Java: 1. Use the encode(formFileName, "UTF-8") method to change the file name encoding. 2. Use the String(formFileName.getBytes("UTF-8"), "ISO-8859-1") statement to solve the problem.

Nov 30, 2019 am 11:38 AM

java

Solution to garbled data inserted into mysql using java

Solution to garbled data inserted into mysql by java: 1. Set the encoding of java and mysql environments to be the same. 2. When creating the mysql database, set the encoding format to utf-8. 3. When connecting to the database, add the specified encoding format after the url to solve the problem of garbled characters.

Nov 30, 2019 am 11:15 AM

java