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 impleme
nt 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.
java反射的作用及应用场景    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 concurrency problems. A thread-safe class or object guarantees that its state will not be corrupted by concurrent access from multiple threads. There are a number
of different techniques that can be used to make a class or object thread-safe, including synchronization, immutability, and lock-free programming.
    5. Describe the different types of thread pools in Java.
    A thread pool is a collection of threads that can be used to execute tasks. Thread pools are often used to improve the performance of applications that need to perform a large number of concurrent tasks. Java provides a number of different types of thread pools, including the ThreadPoolExecutor class, the ScheduledThreadPoolExecutor class, and the ForkJoinPool class. Each type of thread pool has its own advantages and disadvantages, and the choice of which thread pool to use depends on the specific requirements of the application.
    6. Explain the concept of deadlock.
    A deadlock occurs when two or more threads are waiting for each other to release a lock. Deadlocks can be very difficult to debug, and they can cause an application to hang in
definitely. There are a number of different techniques that can be used to prevent deadlocks, including avoiding circular waits, using lock ordering, and using timeouts.

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