Table of Contents ?synchronized principle ?Lock upgrade ?Lock optimization ?Callable interface ?synchronized principle We know that synchronized locks can control multiple threads’ access to shared resources, and two threads will block and wait when accessing the same variable. The synchronized lock is not static, it will be upgraded according to the situation. ?Lock Upgrade JVM […]
Tag: callable
Solved: TypeError: NoneType object is not callable problem
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Binders and wrappers for callable objects
Callable object In C++, a callable object is a broad concept that covers any entity that can be called via the function call operator (). These objects include not only ordinary functions and member functions of a class, but also objects, which can be called like functions. Here are some types of callable objects in […]
When to use Runnable? When to use Callable?
When it comes to Java, we have to talk about multi-threading. Even if you don’t want to say it, the interviewer has to let you say it, right? When it comes to multi-threading, threads are not allowed to be mentioned (isn’t this nonsense). When it comes to threads, we have to talk about Runnable and […]
When to use Runnable and Callable
When it comes to Java, we have to talk about multi-threading. Even if you don’t want to say it, the interviewer has to let you say it, right? When it comes to multi-threading, threads are not allowed to be mentioned (isn’t this nonsense). When it comes to threads, we have to talk about Runnable and […]
The relationship between Callable, Runnable, Future and FutureTask
There are two ways to create a thread: inherit the Thread class or implement the Runnable interface and override the run method. The Thread class itself also implements the Runnable interface. Runnable interface source code: The run method has no return value, so the Callable interface appeared in JDK1.5 Relationship class diagram Callable Callable interface […]
[Beautiful JUC Part.11] Future and Callable governance threads
[Beautiful JUC Part.11] Future and Callable governance thread 1. Why do we need future and callable 1. Defects of Runnable Thread has no return value The run method cannot throw checked Exception This is because the form of the run() method is specified when it is declared. Can only be captured through try/catch. 2. Callable […]
Callable, Future and FutureTask
1. Callable and Runnable Let’s talk about java.lang.Runnable first. It is an interface, and only one run() method is declared in it: public interface Runnable {<!– –> public abstract void run(); } Since the return value of the run() method is of void type, no results can be returned after the task is executed. Callable […]
JDBC’s CallableStatement executes stored procedures
1. Introduction to stored procedures Stored Procedure (Stored Procedure) is a set of SQL statements designed to complete specific functions in a large database system. It is stored in the database and is permanently valid after being compiled once. The user executes a stored procedure by specifying its name and giving parameters (if the stored […]
Multi-threading in one pot (Runnable, Callable, Thread, Future, FutureTask)
Multi-threading in one pot (Thread, Runnable, Callable, Future, FutureTask) In the multi-thread execution cycle, the basic process can be briefly divided into (new execution task->create task process->task assembly process->start/execute thread->get result/status). The processes responsible for various elements are as follows Show: Element name/process New execution task Create task process Task assembly process Start/execute thread Get […]