2024年4月20日发(作者：)

java中高级面试知识点

Java Advanced Interview Knowledge Points.

1. Describe the Java Memory Model (JMM)。

The Java Memory Model (JMM) defines the rules for how

threads in a Java program can access and modify shared

memory. It specifies the semantics of shared memory in a

multi-threaded program, including how reads and writes to

shared variables are ordered and synchronized. The JMM

ensures that all threads in a Java program see a consistent

view of the shared memory, even when they are running on

different processors.

2. Explain the difference between strong and weak

references.

Strong references are the most common type of reference

in Java. When a strong reference points to an object, the

object cannot be garbage collected. Weak references, on the

other hand, are a special type of reference that allows an

object to be garbage collected even if it is still

referenced by a weak reference. Weak references are often

used to implement caches or other data structures that need

to hold references to objects that may be garbage collected.

3. Describe the different types of locks in Java.

Java provides a number of different types of locks that

can be used to control access to shared resources. The most

basic type of lock is the synchronized keyword, which can

be used to lock an entire object or a specific method. The

other types of locks include the ReentrantLock class, the

StampedLock class, and the LockSupport class. Each type of

lock has its own advantages and disadvantages, and the

choice of which lock to use depends on the specific

requirements of the application.

4. Explain the concept of thread safety.

Thread safety refers to the ability of a class or

object to be used by multiple threads without causing