Multi-threaded Case _ Loop Print _ Design 4 threads ...

Requirements: Design 4 threads, of which two threads increase each time to I 1, the other two threads to i reduce each time 1, write out the program.

In the following procedure, Numofprint represents I in the topic

In order to resolve the issue of the other party's awakening. Multiple monitor objects (condition objects) can be created with a single lock .

1 Importjava.util.concurrent.locks.Condition;2 ImportJava.util.concurrent.locks.Lock;3 ImportJava.util.concurrent.locks.ReentrantLock;4 5 /**6  * @authorMa Jian 11:45:39 January 19, 2018 morning7  */8  Public classThreadTest6 {9      Public Static voidMain (string[] args) {Ten         FinalNumberincreate ni =Newnumberincreate (); One         NewThread (NewRunnable () { A  - @Override -              Public voidrun () { the                  for(inti = 0; I < 5; i++) { - ni.num (); -                 } -  +             } -}, "A"). Start (); +         NewThread (NewRunnable () { A  at @Override -              Public voidrun () { -                  for(inti = 0; I < 5; i++) { - ni.num2 (); -                 } -  in             } -}, "B"). Start (); to         NewThread (NewRunnable () { +  - @Override the              Public voidrun () { *                  for(inti = 0; I < 5; i++) { $ ni.num3 ();Panax Notoginseng                 } -  the             } +}, "C"). Start (); A         NewThread (NewRunnable () { the  + @Override -              Public voidrun () { $                  for(inti = 0; I < 5; i++) { $ ni.num4 (); -                 } -  the             } -}, "D"). Start ();Wuyi     } the  - } Wu  - classNumberincreate { About     Private intnum = 1;//the markup for the currently executing thread $     Private intNumofprint = 0;//the printed number -     PrivateLock lock =NewReentrantlock (); -Condition Condition =lock.newcondition (); -Condition Condition2 =lock.newcondition (); ACondition Condition3 =lock.newcondition (); +Condition Condition4 =lock.newcondition (); the  -      Public voidnum () { $ Lock.lock (); the         Try { the             if(num! = 1) { the condition.await (); the             } -System.out.println ("numofprint==" + numofprint++); innum = 2; the condition2.signal (); the}Catch(Exception e) { About}finally { the Lock.unlock (); the         } the  +     } -  the      Public voidnum2 () {Bayi Lock.lock (); the         Try { the             if(Num! = 2) { - condition2.await (); -             } theSystem.out.println ("numofprint==" + numofprint++); thenum = 3; the condition3.signal (); the}Catch(Exception e) { -}finally { the Lock.unlock (); the         } the 94     } the  the      Public voidnum3 () { the Lock.lock ();98         Try { About             if(Num! = 3) { - condition3.await ();101             }102System.out.println ("numofprint==" + numofprint--);103num = 4;104 condition4.signal (); the}Catch(Exception e) {106}finally {107 Lock.unlock ();108         }109  the     }111  the      Public voidnum4 () {113 Lock.lock (); the         Try { the             if(Num! = 4) { the condition4.await ();117             }118System.out.println ("numofprint==" + numofprint--);119num = 1; - condition.signal ();121}Catch(Exception e) {122}finally {123 Lock.unlock ();124         } the 126     }127}

Multi-threaded Case _ Loop Print _ Design 4 threads ...