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public class ThreadTest1{
   private int j;
   public static void main(String args[]){
ThreadTest1 tt=new ThreadTest1();
Inc inc=tt.new Inc();
Dec dec=tt.new Dec();
for(int i=0;i<2;i++){
Thread t=new Thread(inc);
t.start();
t=new Thread(dec);
t.start();
}
}
   private synchronized void inc(){
j++;
System.out.println(Thread.currentThread().getName()+"-inc:"+j);
   }
   private synchronized void dec(){
j--;
System.out.println(Thread.currentThread().getName()+"-dec:"+j);
   }
   class Inc implements Runnable{
public void run(){
for(int i=0;i<100;i++){
inc();
}
}
   }
   class Dec implements Runnable{
public void run(){
for(int i=0;i<100;i++){
dec();
}
}
   }
}
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