How to understand java basics_generic self-limitation?
The Mystery of SelfBounded
In the explanation of generics in "Java Programming Thoughts", self-defined types are mentioned:
class SelfBounded<T extends SelfBounded<T>>{}
The author's definition of it is "I am creating a new class that inherits from a generic type that receives its own class name as a paramete ...
Posted by jpratt on Fri, 17 Feb 2023 03:37:59 +0300
Jigsaw puzzle game (1.0) incomplete version
jigsaw puzzle
1. Project introduction
Jigsaw puzzle game, a complete picture is divided into 16 parts, reassembled into the original picture, and only one grid can be moved at a time. In this project, it is 4*4 squares, that is, 16 scattered pictures, which are broken up each time The pictures are all random.
1. Game start interface
The pic ...
Posted by leetcrew on Tue, 14 Feb 2023 23:12:26 +0300
How Java creates threads from glibc to kernel thread
How Java creates threads (2) From glibc to kernel thread
background
In the previous section, we discussed how java threads are created, and looked at what has been done in the source code from the java code level to the jvm level. The whole process is still relatively complicated. I will paste the call timing diagram summarized in the previou ...
Posted by rantsh on Sat, 11 Feb 2023 23:12:18 +0300
Java 17 record class learning
Java Record
A Java record is a class whose sole purpose is to drive programming with immutable data. Let's look at a simple example.
public record Data( int x, int y)
Here we create a record with headers x and y. The x and y here are called the components of the record. An equivalent class would look like this:
public class Data { ...
Posted by mk_silence on Wed, 25 Jan 2023 09:58:44 +0300
How threads in the thread pool are reused
Preface
I believe everyone knows the relationship between processes and threads. I won’t explain too much here. Since a process is composed of multiple threads, the thread pool is composed of several thread queues. The concurrency is relatively high. In some scenarios, we usually create a thread pool to perform tasks, instead of creating ...
Posted by cesarcesar on Sat, 24 Dec 2022 13:42:28 +0300
You must know JavaFile
The File object represents a path, which can be the path of a file or the path of a folderThis path can exist or not exist
File structure
method nameillustratepublic File(String pathname)Create a file object based on the file pathpublic File(String parent,String child)Creates a file object from a parent pathname string and a child pathname st ...
Posted by Idri on Thu, 22 Dec 2022 08:47:18 +0300
Xuanzi Java Basic Notes 2
User interaction
Basic Scanner
package CH02_JAVAProcessControl;
//Basic Scanner
import java.util.Scanner;
//Guide package
public class XZ01_UserInteraction {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
//Create a Scanner object
System.out.println("Please enter 1");
if (input.h ...
Posted by marsooka on Mon, 28 Nov 2022 07:52:35 +0300
Java - what is thread
Event address: CSDN 21 Day Learning Challenge
1. What is a thread
To understand what a thread is, you must first understand a process
Process: A simple understanding is the running program
Thread: A thread is the smallest unit in a process, and there is at least one thread in a process
There is no concept of a process in the ...
Posted by rajmohan on Mon, 12 Sep 2022 21:15:45 +0300
ReentrantLock lock related methods
catalogue
Implementation class of Lock interface ReentrantLock method ReentrantLockTest test
Thread for testing t1 test
Release the reentry lock correctly Get the current number of reentries t1t2 test
Use the islocked() method to detect the lock state t1t3 test
Use the trylock method to attempt to acquire a lock U ...
Posted by wxflint on Sun, 04 Sep 2022 22:34:19 +0300
[Java]Basic knowledge of interview
#[Java]Basic knowledge of interview review it yourself
foreword
Looking for a job recently, discipline the basics of Java
1. Basic data types
1. Difference and conversion between int and Interger
the difference
1. Integer is a wrapper class for int, which is a basic data type of java 2. Integer variables must be instantiated ...
Posted by tengkie on Sun, 04 Sep 2022 12:38:21 +0300