Yes, a lock can be acquired on a class. This lock is acquired on the class’s Class object.
Yes, in Java, it is possible to acquire a lock on a class. In Java, every class and object has an associated lock, also known as a monitor. This lock is used to control access to the critical section of code to ensure that only one thread can execute the code block at a time.
To acquire a lock on a class, you can use the synchronized keyword in a static method or a block. When a static method or block is declared as synchronized, the lock that is acquired is on the Class object associated with the class. Here’s an example:
public class MyClass {
public static synchronized void myStaticMethod() {
// Code in this method is executed with a lock on the MyClass class
}
public void myInstanceMethod() {
synchronized (MyClass.class) {
// Code in this block is executed with a lock on the MyClass class
}
}
}
In both cases, the lock is on the MyClass.class object, which represents the class itself. This ensures that only one thread can execute the synchronized code block or method at a time for that class.