java - why consumer thread is starting first? - 


package producerconsumer;  public class queue {      int item;     boolean isempty=false;      public int put(int item)     {         this.item=item;         return this.item;     }      public int get()     {         return item;     }  }  package producerconsumer;  public class producer extends thread{       queue q;     public producer(queue q)     {         this.q=q;     }      @override     public void run() {          synchronized (q) {              for(int i=1;i<=5;i++)             {                 if(q.isempty==false)                     try {                         q.wait();                     } catch (interruptedexception e) {                         // todo auto-generated catch block                         e.printstacktrace();                     }                 system.out.println("producer produced = "+q.put(i));                 q.isempty=false;                 q.notify();                 try {                     thread.sleep(2000);                 } catch (interruptedexception e) {                     // todo auto-generated catch block                     e.printstacktrace();                 }             }           }     }  }

package producerconsumer;

public class consumer extends thread {      queue q;     public consumer(queue q)     {         this.q=q;     }      @override     public void run() {         // todo auto-generated method stub         synchronized (q) {             for(int i=1;i<=5;i++)             {                 if(q.isempty==true)                     try {                         q.wait();                     } catch (interruptedexception e) {                         // todo auto-generated catch block                         e.printstacktrace();                     }                      system.out.println("item consumed:"+q.get());                     q.isempty=true;                     q.notify();              }         }     }  }

package producerconsumer;

public class mainapp {     public static void main(string[] args)      {         queue q=new queue();          thread t1=new thread(new producer(q));                 //t1.setpriority(1);         t1.start();          thread t2=new thread(new consumer(q));         t2.start();        } }

this output:

item consumed:0 producer produced = 1 item consumed:1 producer produced = 2 item consumed:2 producer produced = 3 item consumed:3 producer produced = 4 item consumed:4 producer produced = 5

question is: why consumer thread running first ? tried setting priority producer thread also. not working. also, if there other flaw in code or design flaw in code, please mention.

synchronized (q) {

you told of threads never run @ same time.
defeats purpose of threads.


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