Multithreading (mock tickets)-----Java Basics Summary

This time the problem introduced more in-depth, if read this blog, do not read the next article, you will be very confused force. Code:

1  PackageCom.day13.math;2 /** 3 * Class Description: Simulate three windows simultaneous ticketing4 * @authorAuthor: Chenyanlong5 * @versionCreation Date: October 29, 20176 */7  Public classThreadTest1 {8 9      Public Static voidMain (string[] args) {Ten         //Create three thread objects OneSaleticket saleticket1=NewSaleticket ("Windows 1"); ASaleticket saleticket2=NewSaleticket ("Windows 2"); -Saleticket saleticket3=NewSaleticket ("Windows 3"); -          the         //Start Ticketing - Saleticket1.start (); - Saleticket2.start (); - Saleticket3.start (); +     } - } +  A //the window of the ticket at classSaleticketextendsthread{ -      -     intnum=50;//Number of votes -      -      PublicSaleticket (String name) { -         Super(name); in     } -      to  +  - @Override the      Public voidrun () { *          while(true){ $             if(num>0){Panax NotoginsengSystem.out.println (Thread.CurrentThread (). GetName () + "sold the first" +num+ "Ticket"); -num--; the}Else{ +System.out.println ("Tickets are sold out!") "); A                  Break; the             } +         } -     } $}

View CodeOperating effect:

Reasons for the present:

Workaround: Modify this line of code is OK

1 Static int num=50; // Number of votes

View CodeRe-run Effect:

Once again the analysis, suddenly don't want to write, ah, write it out

Workaround:

Forget it, copy the source directly.

1  PackageCom.day13.math;2 /** 3 * Class Description: Simulate three windows simultaneous ticketing4 * @authorAuthor: Chenyanlong5 * @versionCreation Date: October 29, 20176 */7  Public classThreadTest1 {8 9      Public Static voidMain (string[] args) {Ten         //Create three thread objects OneSaleticket saleticket1=NewSaleticket ("Windows 1"); ASaleticket saleticket2=NewSaleticket ("Windows 2"); -Saleticket saleticket3=NewSaleticket ("Windows 3"); -          the         //Start Ticketing - Saleticket1.start (); - Saleticket2.start (); - Saleticket3.start (); +     } - } +  A //the window of the ticket at classSaleticketextendsthread{ -      -     Static intnum=50;//Number of votes -     StaticObject o=NewObject (); -      PublicSaleticket (String name) { -         Super(name); in     } -      to  + @Override -      Public voidrun () { the          while(true){ *             //Synchronizing code blocks: $             synchronized(o) {Panax Notoginseng                 if(num>0){ -System.out.println (Thread.CurrentThread (). GetName () + "sold the first" +num+ "Ticket"); thenum--; +}Else{ ASystem.out.println ("Tickets are sold out!") "); the                      Break; +                 } -             } $         } $     } -}

View Code

Synchronous code block principle:

Operating effect:

Optimize the code again:

1  PackageCom.day13.math;2 /** 3 * Class Description: Simulate three windows simultaneous ticketing4 * @authorAuthor: Chenyanlong5 * @versionCreation Date: October 29, 20176 */7  Public classThreadTest1 {8 9      Public Static voidMain (string[] args) {Ten         //Create three thread objects OneSaleticket saleticket1=NewSaleticket ("Windows 1"); ASaleticket saleticket2=NewSaleticket ("Windows 2"); -Saleticket saleticket3=NewSaleticket ("Windows 3"); -          the         //Start Ticketing - Saleticket1.start (); - Saleticket2.start (); - Saleticket3.start (); +     } - } +  A //the window of the ticket at classSaleticketextendsthread{ -      -     Static intnum=50;//Number of votes -     StaticObject o=NewObject (); -      PublicSaleticket (String name) { -         Super(name); in     } -      to  + @Override -      Public voidrun () { the          while(true){ *             //Synchronizing code blocks: $             synchronized(o) {Panax Notoginseng                 if(num>0){ -System.out.println (Thread.CurrentThread (). GetName () + "sold the first" +num+ "Ticket"); thenum--; +                     Try { AThread.Sleep (100);//each thread executes once and sleeps 100 milliseconds the}Catch(interruptedexception e) { +                         //TODO auto-generated Catch block - e.printstacktrace (); $                     } $}Else{ -System.out.println ("Tickets are sold out!") "); -                      Break; the                 } -             }Wuyi         } the     } -}

View CodeOperating effect:

Multithreading (mock tickets)-----Java Basics Summary