Java Multi-Threading

Tag:package   object   public    Consumer    double    

package com.yuanzijian01;/* *   thread Communication:  when a thread finishes its task, it notifies another thread to complete another task .  Producer and Consumer Wait ():   waiting     If the thread executes the wait method, the thread goes into a wait state, and the thread in the wait state must be called by another thread to wake up the Notify method. Notify ():  wake up      wake thread pool waiting for one of the threads. Notifyall ()  :  wake thread pool all wait   threads. Wait and Notify methods to note: The 1. wait method and the Notify method belong to the object  . The 2. wait method and the Notify method must be used in a synchronous code block or in a synchronous function to  . The 3. wait method and the Notify method must be called by the lock object. Problem one: There is a thread safety issue.   Price disorder ...  *///product class class product{string name;double price;boolean flag =  false;} Class producer extends thread{product p;    publicproducer (Product  p) {    this.p = p;    } @Overridepublic  void  Run ()  {// TODO  auto-generated method stub super.run (); Int i = 0;while (True) {synchronized (p) {if ( P.flag==false) { if (i%2==0) { p.name =  "Apple";  p.price = 6.5;&nbSP;} Else{ p.name= "Banana";  p.price = 2.0; } system.out.println ("producer produces:" + p.name+ "   Price is: "+ p.price";  p.flag = true; i++; p.notifyall ();  //awaken consumers to consume      }else{    try{    p.wait ();     } catch (interruptedexception e) {    e.printstacktrace ();    }     }}}}}//Consumer class customer extends thread{product p; public   customer (Product p)  {this.p = p;} @Overridepublic  void run ()  {while (True) {synchronized  (p)  {if (p.flag==true) {   //products have been produced System.out.println ("Consumer Consumption of" +p.name+ "  Price:" + p.price);p .flag = false;  P.notifyall (); //  wake-up producers to produce}else{//products have not yet been produced, should   wait for producers to produce first. Try {p.wait ();  //consumers are waiting ...}  catch  (interruptedexception e)  {e.printstacktrace();}}}}}} Public class demo01 {public static void main (String[] args)  {//  todo  automatically generated method stub product p = new product ();   //product//Create production Object producer  Producer = new producer (P);//Create Consumer Customer customer = new customer (p);// Call the Start method to turn on thread Producer.start (); Customer.start ();}}

2. Thread Stop

package com.yuanzijian01;/* *   thread Communication:  when a thread finishes its task, it notifies another thread to complete another task .  Producer and Consumer Wait ():   waiting     If the thread executes the wait method, the thread goes into a wait state, and the thread in the wait state must be called by another thread to wake up the Notify method. Notify ():  wake up      wake thread pool waiting for one of the threads. Notifyall ()  :  wake thread pool all wait   threads. Wait and Notify methods to note: The 1. wait method and the Notify method belong to the object  . The 2. wait method and the Notify method must be used in a synchronous code block or in a synchronous function to  . The 3. wait method and the Notify method must be called by the lock object. Problem one: There is a thread safety issue.   Price disorder ...  *///product class class product{string name;double price;boolean flag =  false;} Class producer extends thread{product p;    publicproducer (Product  p) {    this.p = p;    } @Overridepublic  void  Run ()  {// TODO  auto-generated method stub super.run (); Int i = 0;while (True) {synchronized (p) {if ( P.flag==false) { if (i%2==0) { p.name =  "Apple";  p.price = 6.5;&nbSP;} Else{ p.name= "Banana";  p.price = 2.0; } system.out.println ("producer produces:" + p.name+ "   Price is: "+ p.price";  p.flag = true; i++; p.notifyall ();  //awaken consumers to consume      }else{    try{    p.wait ();     } catch (interruptedexception e) {    e.printstacktrace ();    }     }}}}}//Consumer class customer extends thread{product p; public   customer (Product p)  {this.p = p;} @Overridepublic  void run ()  {while (True) {synchronized  (p)  {if (p.flag==true) {   //products have been produced System.out.println ("Consumer Consumption of" +p.name+ "  Price:" + p.price);p .flag = false;  P.notifyall (); //  wake-up producers to produce}else{//products have not yet been produced, should   wait for producers to produce first. Try {p.wait ();  //consumers are waiting ...}  catch  (interruptedexception e)  {e.printstacktrace();}}}}}} Public class demo01 {public static void main (String[] args)  {//  todo  automatically generated method stub product p = new product ();   //product//Create production Object producer  Producer = new producer (P);//Create Consumer Customer customer = new customer (p);// Call the Start method to turn on thread Producer.start (); Customer.start ();}}

3. Daemon thread

package com.yuanzijian03;/* daemon Thread (background thread): The daemon thread will die if only   daemon threads are left in a process. Demand:  simulation QQ download update package. A thread by default is not a daemon thread. */public class demo03 extends thread {public demo03 (String name) {Super (name );} @Overridepublic  void run ()  {for (int i = 1 ; i<=100 ; i++) {System.out.println ("update package currently downloads" +i+ "%"), if (i==100) {System.out.println ("update package download complete, ready to install ...");} Try {thread.sleep (100);}  catch  (interruptedexception e)  {e.printstacktrace ();}} Public static void main (String[] args)  { Demo03 d = new  Demo03 ("Background thread");  d.setdaemon (true);  //setdaemon ()   Sets whether the thread is a daemon thread, true is a daemon thread, and  false is a non-daemon thread.  system.out.println ("Is it a daemon thread?") "+ d.isdaemon ()");  //determines whether the thread is a daemon thread.  d.start ();   for (int i = 1 ; i<=100 ; i++) {  System.out.println (Thread.CurrentThread (). GetName () + ":" +i);  } }}

4.join method Join

Package cn.itcast.thread;/* join method.   Join   *///mom Class  mon extends thread{public void run ()  { System.out.println ("Mother washes vegetables"); System.out.println ("Mother cut Vegetables"); System.out.println ("Mother ready to stir-fry, found no soy sauce anymore."); /Call his son to soy sauce Son s= new son (); S.start (); Try {s.join ();   //join.   A thread if a join statement is executed, then a new thread joins, and the thread executing the statement must give in to the newly joined line enters upgradeable to complete the task before it can continue execution. } catch  (interruptedexception e)  {e.printstacktrace ();} System.out.println ("mother continues to stir fry"); System.out.println ("Dinner with the whole Family");}}  class son extends thread{@Overridepublic  void run ()  {system.out.println (" Son downstairs. "); Try {thread.sleep (1000);}  catch  (interruptedexception e)  {e.printstacktrace ();} System.out.println ("The son has been walking forward"); System.out.println ("The son finishes the soy sauce"); System.out.println ("Go upstairs, give the soy sauce to Mom");} Public class demo8 {public static void main (String[] args)  {Mon m  = new mon (); M.start ();}} 

Java Multi-Threading