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10 commonly used methods for java arrays

Arrays provided in the Java language are used to store fixed-size elements of the same type. This article introduces 10 commonly used methods of Java arrays. I hope it will be of some help to you.

Jun 19, 2020 pm 05:28 PM

java 数组

The difference between string, stringbuffer and stringbuilder

The differences between stringbuffer, stringbuilder, and string are: 1. The execution speed is different, and string is the slowest; 2. The thread safety is different, StringBuffer is thread-safe, and StringBuilder is thread-unsafe.

Jun 19, 2020 pm 05:24 PM

stringbuffer stringbuilder string

Detailed explanation of the use of append() method in java

In Java, you can use the [append()] function to append a data. This function is used to copy the required string to a new array. Its syntax is [append(String s)], and its parameter s represents the appended string. .

Jun 18, 2020 pm 01:58 PM

java

What processes does javac compilation include?

javac compilation includes lexical analysis, filling symbol tables, plug-in annotation processor processing annotations, semantic analysis, decoding syntactic sugar, and generating bytecode.

Jun 18, 2020 pm 01:38 PM

javac

Detailed explanation of Java automatic garbage collection tutorial

If used improperly in Java programming, no matter how large the memory is, it will be exhausted. This article will introduce to you how to save Java memory space and let the Java program automatically recycle garbage.

Jun 18, 2020 pm 01:21 PM

Java 垃圾回收

JPA dynamic query statement (detailed code explanation)

We are now making an OA system. When writing all the newly added data to the database, we use jpa specifications. Now we record the dynamic query statements in jpa. In fact, these statements can be written using sql statements. How to write them specifically? Let’s take a look at the content below.

Jun 18, 2020 pm 01:13 PM

JPA 动态查询

Introduction to Java callback mechanism

The so-called callback method means that the caller passes a method that needs to be called back as a parameter to the method to be called. After the called method is executed, the method is called by returning the parameter. The method passed as a parameter is called Make callback method.

Jun 17, 2020 pm 05:06 PM

Java

What is the storage type of args when passed into a function in Java?

In Java, the storage type of args when passed into a function is treated as an array, and can only appear at the end of the parameter list. [...] is located between the variable type and the variable name, with or without spaces before and after.

Jun 17, 2020 pm 04:49 PM

java

How to use visual stdio for java development

The method of using [visual stdio] for java development is: first open VS2012 and create a new project; then select the win32 console application and name it the [learn] file; then create a new file with the suffix [.java] in the source file ;Finally enter the code.

Jun 17, 2020 pm 03:29 PM

java

Detailed explanation of usage of java enumeration type enum

The Java enumeration class is a set of predefined constants. Using the enum keyword to declare this class, you can group related constants into an enumeration type. The syntax is [public enum class name].

Jun 17, 2020 pm 03:18 PM

java

What is the function of java servlet?

The role of servlets is to extend the capabilities of the server by creating a framework to provide request and response services on the Web. Generally speaking, a servlet is used to receive request data from the client, and then call the underlying service to process the data, generate results, and return the data.

Jun 17, 2020 pm 02:27 PM

java servlet

4 stages of Servlet life cycle

The four stages of the Servlet life cycle: 1. Initialization by calling the "init()" method; 2. Calling the "service()" method to handle the client's request; 3. Termination by calling the "destroy()" method; 5. Garbage collection is performed by the JVM's garbage collector.

Jun 17, 2020 am 11:14 AM

java

What does public static void main mean?

[public static void main] is the entry address of the Java program. When the Java virtual machine runs the program, the first thing it looks for is the [main] method. Only the Java program with the [main()] method can be run by the Java virtual machine.

Jun 16, 2020 pm 05:25 PM

java

Commonly used algorithms: Hash algorithm

Programmers should be familiar with hashing algorithms, such as the industry-famous MD5, SHA, CRC, etc. In daily development, we often use a Map to load some data with a (key, value) structure, and use the hashing algorithm to (1) The time complexity improves program processing efficiency.

Jun 16, 2020 pm 05:18 PM

java