What are the statuses of Java threads?

1. New (New) : Threads that have not been started after creation are in this state.

2. Runnable: Including Running and Ready in the operating system thread state, that is, the thread in this state may be executing, or it may be waiting for the operating system to It allocates execution time.

3. Waiting : Threads in this state will not be allocated processor execution time. They have to wait to be explicitly awakened by other threads. The following methods will cause the thread to fall into a waiting state:

The Object::wait() method without setting the Timeout parameter;

The Thread::join() method without setting the Timeout parameter;

LockSupport::park() method.

4. Timed Waiting : Threads in this state will not be allocated processor execution time, but they do not need to wait to be explicitly awakened by other threads. They will then be automatically awakened by the system. The following methods will cause the thread to enter a time-limited waiting state:

The Object::wait() method with the Timeout parameter set;

The Thread::join() method with the Timeout parameter set;

LockSupport::parkNanos() method;

LockSupport::parkUntil() method.

5. Blocked : The thread is blocked. The difference between "blocked state" and "waiting state" is that "blocked state" is waiting to obtain an exclusive lock. This event will occur when another thread gives up the lock; and the "waiting state" is waiting for a period of time, or a wake-up action occurs. The thread will enter this state while the program is waiting to enter the synchronization area.

6. Terminated: The thread status of the terminated thread, the thread has ended execution.

What are the basic data types of java

The basic data types of Java are divided into:

1. Integer type, used to represent the data type of integer.

2. Floating point type, a data type used to represent decimals.

3. Character type. The keyword of character type is "char".

4. Boolean type is the basic data type that represents logical values.

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