Two ways to create a thread compare thread VS Runnable

1. First of all, two ways to create a thread

One way is to inherit the thread class and override the run () method

1  Public classMyThreadextendsthread{2 @Override3      Public voidrun () {4         //TODO auto-generated Method Stub5         6     }7 }8 //Thread Usage9MyThread MT =NewMyThread ();//Creating ThreadsTenMt.start ();//Start Thread

Another way is to implement the Runnable interface

1  Public classMyThreadImplementsrunnable{2 @Override3      Public voidrun () {4         //TODO auto-generated Method Stub5         6     }7 }8 //Thread Usage9MyThread MT =NewMyThread ();TenThread thread =NewThread (MT);//Creating Threads OneThread.Start ();//Start Thread

2. Two ways to create a thread comparison

1th: Through the creation of threads can be seen, one is to inherit one is to implement the interface, but Java can only inherit a parent class, it is possible to implement a feature of multiple interfaces, so the use of runnable method can avoid the thread mode due to Java single inheritance caused by the flaw.

2nd: runnable code can be shared by multiple threads (thread instances) and is suitable for multiple threads to handle uniform resources.

Example: Simulated sell tickets, assuming that there are 5 tickets left, two ways to create a threading simulation

Ticketthread.java//The case of using inheritance to simulate 3 windows selling 5 tickets

1  Public classTicketthread {2      Public Static voidMain (string[] args) {3         //created 3 threads, simulated three windows sell tickets4MyThread MT1 =NewMyThread ("Thread One");5MyThread mt2 =NewMyThread ("Thread Two");6MyThread MT3 =NewMyThread ("Thread Three");7         8         //Start Thread9 Mt1.start ();Ten Mt2.start (); One Mt3.start (); A     } -  - } the  - classMyThreadextendsthread{ -     Private intnum = 5;//Simulation also has 5 tickets left -     PrivateString name;//used to represent the thread name +      -      PublicMyThread (String name) { +          This. Name =name; A     } at      - @Override -      Public voidrun () { -          while(num > 0){ -num--; -System.out.println (name+ "sold a ticket, the remaining votes are" +num); in         } -     } to}

The result of the operation is:

1 The thread sold one ticket at a 4 of the remaining votes2 The thread sold one ticket at a 3 of the remaining votes3 The thread sold one ticket at a 2 of the remaining votes4 The thread sold one ticket at a 1 of the remaining votes5 The thread sold one ticket at a 0 of the remaining votes6 thread two sold a ticket with 4 remaining votes7 thread two sold a ticket with 3 remaining votes8 thread two sold a ticket with 2 remaining votes9 thread two sold a ticket with 1 remaining votesTen thread two sold a ticket with 0 remaining votes One thread three sold a ticket, the remaining number of votes is 4 A thread three sold a ticket, the remaining number of votes is 3 - thread three sold a ticket, the remaining number of votes is 2 - thread three sold a ticket, the remaining number of votes is 1 theThread three sold a ticket, the remaining number of votes is 0

You can see that 15 tickets have been sold, and 5 tickets have been turned into each thread.

Ticketrunnable.java//with runnable implementation

1  Public classtickerrunnable{2      Public Static voidMain (string[] args) {3MyThread MT =NewMyThread ();4         //also create 3 threads5Thread T1 =NewThread (MT, "thread One"));6Thread t2 =NewThread (MT, "thread Two");7Thread t3 =NewThread (MT, "thread three");8         //Start Thread9 T1.start ();Ten T2.start (); One T3.start (); A     } -  - } the  - classMyThreadImplementsrunnable{ -     Private intnum = 5;//Simulation also has 5 tickets left -      + @Override -      Public voidrun () { +          while(num > 0){ Anum--; atSystem.out.println (Thread.CurrentThread (). GetName () + "sold a ticket with the remaining votes" +num); -         } -     } -}

The result of the operation is:

1 The thread sold one ticket at a 4 of the remaining votes 2 thread three sold a ticket, the remaining number of votes is 3 3 thread three sold a ticket, the remaining number of votes is 1 4 thread two sold a ticket with 0 remaining votes 5 Thread One sold a ticket, the remaining votes of 2

This shows that multiple threads share the 5 variable in the Runnbale, as to why the result is not the output of the remaining votes 4 3 2 1 0, this is due to thread scheduling problems, each run will see a different result.

Two ways to create a thread compare thread VS Runnable