Threads and processes

One 、 Definition

process ： A process is an application running in the system . Each process is independent , Each process runs in its dedicated and protected memory , A process is an independent unit of the system for resource allocation and scheduling .
Threads ： Thread is the basic execution unit of a process , All tasks of a process are executed in threads . yes CPU Basic unit of dispatch and dispatch . The program will start a thread by default , This thread is called the main thread or UI Threads .

Two 、 contact

The process wants to perform the task , There must be threads . Threads of the same process share the address space of this process , Threads in the same process share the resources of the process .

3、 ... and 、 difference

Thread cannot execute independently , Must exist in the application , Multiple thread execution control provided by the application . Multithreading means that multiple execution parts in the same process can be executed at the same time , To achieve process scheduling and management and resource allocation .

notes ： Update complete JVM The differences between the two will be introduced in detail from the perspective of memory after the series .