Synchronized block example
Instead of synchronizing the entire method we can synchronize a small piece of code using block.
Example
public class Sample implements Runnable {
public void print() {
for (int i = 0; i < 5; i++) {
System.out.println(Thread.currentThread().getName() + ": " + i);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
synchronized(this) {
for (int i = 6; i < 10; i++) {
System.out
.println(Thread.currentThread().getName() + " synchronized: " + i);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
public void run() {
// TODO Auto-generated method stub
print();
}
}
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Sample s1 = new Sample();
Sample s2 = new Sample();
Thread t1 = new Thread(s1);
Thread t2 = new Thread(s1);
Thread t3 = new Thread(s2);
t1.setName("t1");
t2.setName("t2");
t3.setName("t3");
t1.start();
t2.start();
t3.start();
}
}Output:
t2: 0 t3: 0 t1: 0 t1: 1 t3: 1 t2: 1 t3: 2 t2: 2 t1: 2 t3: 3 t2: 3 t1: 3 t2: 4 t3: 4 t1: 4 t2 synchronized: 6 t3 synchronized: 6 t2 synchronized: 7 t3 synchronized: 7 t2 synchronized: 8 t3 synchronized: 8 t3 synchronized: 9 t2 synchronized: 9 t1 synchronized: 6 t1 synchronized: 7 t1 synchronized: 8 t1 synchronized: 9
