002 Creation of Threads

One. Overview

There are two ways to create a thread, but in essence there is only one.

[1] inherits the thread, overriding the run () method.

[2] Implement the Runnable interface, overriding the run () method.

We can actually implement the Runnable method as a strategy model.

Two. Inheriting thread creating threads

@Test      Public void Test () {        new  Thread () {            publicvoid  run () {                  for (;;)                    System. out. println ("running .... ") " );            };        }. Start ();    }

Three. Implementing the Runnable Interface

@Test      Public void test2 () {        new Thread (new  Runnable () {            @Override            public void run () {                for(;;)                    System. out. println ("");            }        }). Start ();    }

Four. Compare

The only way a thread is created is to create a thread object and then start the thread, otherwise the new state's thread is actually not a real thread.

So, what about the Runnable interface?

The run () method is just a thread logical unit.

　　We can understand that as a strategy pattern application, we create threads that are executing unused algorithms (policies).

Note: The start of a thread requires the invocation of JNI code, which means that the JVM is assigned a thread resource before it can be counted as a thread.

002 Creation of Threads