please see the output of the code but i m expecting some other output

Code:
class Account{
private int amtBalance;
public synchronized void debitAmount(int amount){

try{
System.out.println("Checking Balance");
while(amtBalance-amount<0){
System.out.println("Not hav enough balance");
wait();
}
System.out.println("debiting");
amtBalance-=amount;

}
catch(Exception e){

}
}
public synchronized void creditAmount(int amount){
amtBalance+=amount;
System.out.println("balance:" + amtBalance + "Notify");
notify();
}
}

class Thread1 extends Thread{
Account ac;
Thread1(Account ac){
this.ac=ac; }

public void run()
{
ac.debitAmount(300);
}
}
class Thread2 extends Thread{
Account ac;
Thread2(Account ac){
this.ac=ac; }
public void run()
{
int i=100;
while(i<=300){
ac.creditAmount(100);
i+=100;
}
}
}

public class ThreadMain{
public static void main(String []args){
Account ac=new Account();
Thread1 th1=new Thread1(ac);
th1.start();
Thread2 th2=new Thread2(ac);
th2.start();

}
}

Output:
Checking Balance
Not hav enough balance
balance:100Notify
balance:200Notify
balance:300Notify
debiting

my expected output:
Checking Balance
Not hav enough balance
balance:100Notify
Not hav enough balance
balance:200Notify
Not hav enough balance
balance:300Notify
debiting

Please reply i am not getting my expected output
Thanks in advance

pi gupta wrote:Code:
class Account{ private int amtBalance; public synchronized void debitAmount(int amount){ try{ System.out.println("Checking Balance"); while(amtBalance-amount<0){ System.out.println("Not hav enough balance"); wait(); } System.out.println("debiting"); amtBalance-=amount; } catch(Exception e){ } } public synchronized void creditAmount(int amount){ amtBalance+=amount; System.out.println("balance:" + amtBalance + "Notify"); notify(); } } class Thread1 extends Thread{ Account ac; Thread1(Account ac){ this.ac=ac; } public void run() { ac.debitAmount(300); } } class Thread2 extends Thread{ Account ac; Thread2(Account ac){ this.ac=ac; } public void run() { int i=100; while(i<=300){ ac.creditAmount(100); i+=100; } } } public class ThreadMain{ public static void main(String []args){ Account ac=new Account(); Thread1 th1=new Thread1(ac); th1.start(); Thread2 th2=new Thread2(ac); th2.start(); } }

Output:
Checking Balance
Not hav enough balance
balance:100Notify
balance:200Notify
balance:300Notify
debiting

my expected output:
Checking Balance
Not hav enough balance
balance:100Notify
Not hav enough balance
balance:200Notify
Not hav enough balance
balance:300Notify
debiting

Please reply i am not getting my expected output
Thanks in advance

Sending a notification doesn't automatically do a context switch back to the waiter -- in your case, the crediting thread has enough of the time slice to fully credit the account up to 300, before the debit thread woke up from the notification.

Henry

Thanks Henry,
But how can i know about the time slice..
is it platform dependent???

pi gupta wrote:Thanks Henry,
But how can i know about the time slice..
is it platform dependent???

With the current JVMs, I believe they are all integrated with the native threading system -- hence, yes, scheduling is platform dependent.

Henry

Thanks Henry