Java Learning Notes (42)-Producer consumer models

Wait (), notify ()

/* * Wait (), notify () * 1. Two methods can only be executed in the synchronized code block, because the thread that holds the lock will only have the lock * 2 in sync. Two methods when you manipulate a thread in synchronization, you must identify the object lock held by the operating thread * 3. Wait and wake must be the same object lock */ Public  class Test05 {     Public Static voidMain (string[] args) {MyThread3 mt=NewMyThread3 (); Thread th=NewThread (MT,"Thread One"); Th.start ();Try{Thread.Sleep ( -);//The main thread sleeps for 2 seconds, allowing thread th to wait in the pool for a while}Catch(Interruptedexception e)        {E.printstacktrace (); }//Interrupts thread in the wait pool in Mt object th        //th.interrupt ();Synchronized (MT) {mt.notify ();//wake-up object A thread in the wait pool of Mt}    }} class MyThread3 implements Runnable{@Override Public voidRun () {//Synchronous code blockSynchronized ( This) {System.out.println ("* * * Enter Synchronous code block");Try{Wait ();//thread enters the wait pool, is in a blocked stateSystem.out.println ("***wait the lock again."); }Catch(Interruptedexception e) {System.out.println ("***"+thread.currentthread (). GetName () +"Be interrupted!" "); } for(intI=1; i<= -; i++) {System.out.println (Thread.CurrentThread (). GetName () +"***"+i); } System.out.println ("* * * Synchronization code block execution ends! "); }    }}

Producer, consumer model

/* Thread communication: Multiple threads operate on the same resource, but the action is different * producer, consumer model * WAIT () and notify () methods are generally used in producer and consumer models to wait for synchronized data */ Public  class Test06 {     Public Static voidMain (string[] args) {Person person =NewPerson (); Input in =NewInput (person); Output out =NewOutput (person); Thread Th1 =NewThread (In,"producers have produced:");//Producing personThread Th2 =NewThread (out,"Consumers are consuming:");//Remove personTh1.start ();    Th2.start (); }} class  person {String name; String sex;BooleanFlag =true;//True indicates that a person needs to be generated, false means that the person removed}//production, into class Input implements Runnable {    Privateperson person; PublicInput (person person) { This. person = person; } @Override Public voidRun () {intx =0; while(true) {synchronized (person) {if(Person.flag) {if(x = =0) {//judgment interval to produce different peoplePerson.name ="Tom"; Person.sex ="Male"; }Else{Person.name ="Zhang San"; Person.sex ="female"; } x = (x +1) %2;//interval to produce different peoplePerson.flag =false;//Put it once, take it oncePerson.notify ();//wake-up thread of a person}Else{Try{person.wait ();//If you do not need to produce a person, wait}Catch(Interruptedexception e)                    {E.printstacktrace (); }                }            }        }    }}//consumption, out class Output implements Runnable {    Privateperson person; PublicOutput (person person) { This. person = person; } @Override Public voidRun () { while(true) {synchronized (person) {if(!person.flag) {System.out.println (Thread.CurrentThread (). GetName () +person.name +"***"+ Person.sex); Person.flag =true; Person.notify ();//wake-up thread for production people}Else{Try{person.wait ();//If you do not need to remove the person, wait}Catch(Interruptedexception e)                    {E.printstacktrace (); }                }            }        }    }}

Java Learning Notes (42)-Producer consumer models