java.lang.Thread class
Creating a flow of control in Java is nothing but creating an object of java.lang.Thread class.
An object of Thread class can be created in three ways. They are:
-
Directly Thread t=new Thread ();
-
Using factory method Thread t1=Thread.currentThread ();
-
Using sub-class that extends Thread class
public class Thread extends Object implements
Instance Thread State Methods
1. void start () Used for making the Thread to start to execute the thread logic. The method start is internally calling the method run ().
2. void run (): The thread that logic must be defined only in run () method. When the thread is started, the JVM looks for the appropriate run () method for executing the logic of the thread. Thread class is a concrete class and it contains all defined methods and all these methods are being to final except run () method. run () method is by default contains a definition with null body. Since we are providing the logic for the thread in run () method. Hence it must be overridden by extending Thread class into our own class.
3. void suspend() - This method is used for suspending the thread from current execution of thread. When the thread is suspended, it sends to waiting state by keeping the temporary results in Thread control block (TCB) & Process control block (PCB). (deprecated)
4. void resume() -resumes suspend() Thread. Resumed to start executing from where it left out previously by retrieving the previous result from PCB (deprecated)
5. void interrupt() -Interrupts this thread
6. void join() -Waits for this thread to die.
7. void join(long mil) -Waits at most milliseconds for this thread to die
8. void stop() -is used to stop the thread(deprecated).
Static Methods
Static void sleep(long ms) - sleeps/temporary block the thread for specified amount of time
Static void yield () - pause current thread and allow other threads to execute
Static Thread currentThread() -Get currently running thread Object. mainly used in run()
Static int activeCount() -Counts the no.of active threads in current thread group& subgroups.