What are synchronized methods and synchronized statements (CoreJava)

Question :What are synchronized methods and synchronized statements? (CoreJava)
Answer :Synchronized methods are methods that are used to control access to an
object. A thread only executes a synchronized method after it has acquired
the lock for the method's object or class. Synchronized statements are
similar to synchronized methods. A synchronized statement can only be
executed after a thread has acquired the lock for the object or class
referenced in the synchronized statement.