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/* N59mBA - synchronized block */
/*
1. agar resource me keywal kuch part par he sync lagana hai to sync. block ka use karege
jisse wo speed badeygee project ki
2. syntax
synchronized(object reference expression)
*/
class BookTheaterSeat{
int total_seats = 10;
void bookSeat(int seats){
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
synchronized(this){
if(total_seats>=seats){
System.out.println(seats+" seats booked successfully");
total_seats=total_seats-seats;
System.out.println("seats left = " + total_seats);
}
else{
System.out.println("sorry seats cannot be booked..!!");
System.out.println("seats left = "+total_seats);
}
}
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
System.out.println(Thread.currentThread().getName());
}
}
public class N59mBA extends Thread{
static BookTheaterSeat b;
int seats;
public void run(){
b.bookSeat(seats);
}
public static void main(String[] args) {
b = new BookTheaterSeat();
N59mBA rajat = new N59mBA();
rajat.seats=7;
rajat.start();
N59mBA amit = new N59mBA();
amit.seats=6;
amit.start();
}
}
// both thread start simultaneously but one aquare lock of the object
/*
ramannegi@Ramans-MacBook-Pro x % javac N59mBA.java
ramannegi@Ramans-MacBook-Pro x % java N59mBA
Thread-0
Thread-0
Thread-0
Thread-0
Thread-0
Thread-0
Thread-1
Thread-1
Thread-1
Thread-1
Thread-1
Thread-1
7 seats booked successfully
seats left = 3
Thread-0
Thread-0
Thread-0
Thread-0
Thread-0
Thread-0
Thread-0
sorry seats cannot be booked..!!
seats left = 3
Thread-1
Thread-1
Thread-1
Thread-1
Thread-1
Thread-1
Thread-1
*/
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