Threads in Java
A thread🧵
A thread🧵
📌What are threads?
Threads allow a program to operate more efficiently by doing multiple things at the same time.
Threads allow a program to operate more efficiently by doing multiple things at the same time.
Every java application has at least one thread – the main thread. But from the application point of view – main is the first java thread and we can create multiple threads from it.
Multithreading refers to two or more threads executing concurrently in a single program
Multithreading refers to two or more threads executing concurrently in a single program
Threads can be used to perform complicated tasks in the background without interrupting the main program.
📌Life cycle of a thread 
🔸New −
A new thread begins its life cycle in the new state. It remains in this state until the program starts the thread. It is also referred to as a born thread
A new thread begins its life cycle in the new state. It remains in this state until the program starts the thread. It is also referred to as a born thread
🔸Runnable −
After a newly born thread is started, the thread becomes runnable. A thread in this state is considered to be executing its task
After a newly born thread is started, the thread becomes runnable. A thread in this state is considered to be executing its task
🔸Waiting −
Sometimes, a thread transitions to the waiting state while the thread waits for another thread to perform a task. A thread transition back to the runnable state only when another thread signals the waiting thread to continue executing
Sometimes, a thread transitions to the waiting state while the thread waits for another thread to perform a task. A thread transition back to the runnable state only when another thread signals the waiting thread to continue executing
🔸Timed Waiting −
A runnable thread can enter the timed waiting state for a specified interval of time. A thread in this state transitions back to the runnable state when that time interval expires or when the event it is waiting for occurs
A runnable thread can enter the timed waiting state for a specified interval of time. A thread in this state transitions back to the runnable state when that time interval expires or when the event it is waiting for occurs
🔸Terminated (Dead) −
A runnable thread enters the terminated state when it completes its task or otherwise terminates
A runnable thread enters the terminated state when it completes its task or otherwise terminates
📌Ways of creating threads
There are two ways of creating threads -
1. Extending Thread class
2. Implementing Runnable interface
There are two ways of creating threads -
1. Extending Thread class
2. Implementing Runnable interface
🔸Extending Thread class -
We need to override the run() method in the Thread class. To start the thread we use the start() method on the thread object which executes a call to the run() method.
We need to override the run() method in the Thread class. To start the thread we use the start() method on the thread object which executes a call to the run() method.
🔸Implementing Runnable Interface -
📌Thread priorities
Every Java thread has a priority that helps determine the order in which threads are scheduled.
By default, every thread is given priority NORM_PRIORITY (a constant of 5)
MIN_PRIORITY = 1
MAX_PRIORITY = 10
Every Java thread has a priority that helps determine the order in which threads are scheduled.
By default, every thread is given priority NORM_PRIORITY (a constant of 5)
MIN_PRIORITY = 1
MAX_PRIORITY = 10
📌Different Thread methods
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