printeo.txt

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;


/* Name of the class has to be "Main" only if the class is public. */
class Ideone{

 public static void main(String[] args) {
  // shared class object
  SharedPrinter sp = new SharedPrinter();
  // creating two threads
  Thread t1 = new Thread(new EvenNumProducer(sp, 10));
  Thread t2 = new Thread(new OddNumProducer(sp, 10));
  // starting threads
  t1.start();
  t2.start();
 }

}
// Shared class used by both threads
class SharedPrinter{
 boolean evenFlag = false;
 
 //Method for printing even numbers
 public void printEvenNum(int num){
  synchronized (this) {
    // While condition as mandated to avoid spurious wakeup
   while(!evenFlag){
    try {
     //asking current thread to give up lock
     wait();
    } catch (InterruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
   System.out.println(num);
   evenFlag = false;
   // Wake up thread waiting on this monitor(lock)
   notify();
   
  }
  
 }
 
 //Method for printing odd numbers
 public void printOddNum(int num){
  synchronized (this) {
    // While condition as mandated to avoid spurious wakeup
   while(evenFlag){
    try {
     //asking current thread to give up lock
     wait();
    } catch (InterruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
   System.out.println(num);
   evenFlag = true;
   // Wake up thread waiting on this monitor(lock)
   notify();
   
  }
 }
}

// Thread Class generating Even numbers
class EvenNumProducer implements Runnable{
    SharedPrinter sp;
    int index;
    EvenNumProducer(SharedPrinter sp, int index){
        this.sp = sp;
        this.index = index;
    }
    @Override
    public void run() {
        for(int i = 2; i <= index; i = i+2){
            sp.printEvenNum(i);
        }
        
    }
    
}

//Thread Class generating Odd numbers
class OddNumProducer implements Runnable{
    SharedPrinter sp;
    int index;
    OddNumProducer(SharedPrinter sp, int index){
        this.sp = sp;
        this.index = index;
    }
    @Override
    public void run() {
        for(int i = 1; i <= index; i = i+2){
            sp.printOddNum(i);
        }
    }
}