Java Coding Problems

Locking at the object level

Locking at object level can be achieved by marking a non-static block of code or non-static method (the lock object for that method's object) with synchronized. In the following examples, only one thread at a time will be allowed to execute the synchronized method/block on the given instance of the class:

• Synchronized method case:

public class ClassOll {  public synchronized void methodOll() {    ...  }}

• Synchronized block of code:

public class ClassOll {  public void methodOll() {    synchronized(this) {      ...    }  }}

• Another synchronized block of code:

public class ClassOll {  private final Object ollLock = new Object();  public void methodOll() {    synchronized(ollLock) {      ...    }  }}