Communication between threads sharing data security issues

1 //Communication between Threads: The task of the thread is different, but the data for the thread operation is the same. 2 3 //describe the data4 classResource5 {6      PublicString name;7      PublicString gender;8      PublicResource () {}9 }Ten  One //describe input tasks A classInputImplementsRunnable - { -     PrivateResource Res; the      PublicInput (Resource res) -     { -          This. res =Res; -     } +      Public voidRun () -     { +         inti = 1; A          while(true) at         { -             synchronized(RES)//Plus sync lock ① -             { -                 if(i==1) -                 { -Res.name = "Pig xiaoming"; inRes.gender = "Male"; -                 } to                 Else +                 { -Res.name = "Leg Leg"; theRes.gender = "female"; *                 } $i= (++i)%2;Panax Notoginseng             } -         } the     } + } A  the //describe the output task + classOutputImplementsRunnable - { $     PrivateResource Res; $      PublicOutput (Resource res) -     { -          This. res =Res; the     } -      Public voidRun ()Wuyi     { the          while(true) -         {     Wu             synchronized(RES)//Plus sync lock ②,① Place and here for the same lock!  -             { AboutSystem.out.println (Res.name + "..." +res.gender); $             } -         } -     } - } A  + classTest the { -      Public Static voidMain (string[] args) $     { the         //Create a resource theResource res =NewResource (); the         //Create an input task theInput input =NewInput (res); -         //Create an output task inOutput output =NewOutput (res); the         //Creating an input thread theThread T1 =NewThread (input); About         //creating an Output thread theThread t2 =NewThread (output); the         //Start Thread the T1.start (); + T2.start (); -  the     }Bayi}

Two basic requirements for synchronization:

1. There are at least two threads
2. Use the same lock

If you do not use synchronization, the following error will occur:

After using synchronization, the error no longer occurs:

Communication between threads sharing data security issues