Java thread

Oct 27, 2015Download as PPT, PDF4 likes554 views

Processes and Threads, Runnable Interface and Thread Class Thread Objects, Defining and Starting a Thread, Pausing Execution with Sleep, Interrupts, Thread States, Joins, Synchronization

JAVA
Thread
Prepared by
Miss. Arati A. Gadgil

Thread
There are two ways to create a thread
1.By extending Thread class
2. By implementing Runnable interface
2

Thread States
1.New
2.Runnable
3.Running
4.Non-Runnable (Blocked)
5.Terminated
3

4
New
Runnable
Running
Terminated
Non-Runnable
Blocked
start()
run()
Sleep,IO complete
Sleep,bock,IO wait

Constructors of Thread class
Thread()
Thread(String name)
Thread(Runnable r)
Thread(Runnable r,String name
Methods of Thread class
public void run()
is used to perform action for a thread.
public void start()
starts the execution of the thread.JVM calls the run()
method on the thread.
public void sleep(long miliseconds)
Causes the currently executing thread to sleep
(temporarily cease execution) for the specified number of
milliseconds.
5

public int getPriority()
returns the priority of the thread.
public int setPriority(int priority)
changes the priority of the thread.
public String getName()
returns the name of the thread.
public void setName(String name)
changes the name of the thread.
public Thread currentThread()
returns the reference of currently executing thread.
public boolean isAlive()
tests if the thread is alive.
public void stop()
is used to stop the thread.
6

Runnable Interface
Runnable interface have only one method named run().
public void run()
is used to perform action for a thread.
7

class Multi extends Thread
{
public void run()
{
System.out.println("thread is running...");
}
public static void main(String args[])
{
Multi t1=new Multi();
t1.start();
}
}
8

class Multi implements Runnable
{
public void run()
{
System.out.println("thread is running...");
}

public static void main(String args[])
{
Multi3 m1=new Multi3();
Thread t1 =new Thread(m1);
t1.start();
}
}
9

sleep() method
Thread.sleep causes the current thread to suspend execution
for a specified period.
public static void sleep(long miliseconds)throws
InterruptedException
public static void sleep(long miliseconds, int nanos)throws
InterruptedException
10

join() method
The join method allows one thread to wait for the completion
of another.
Overloads of join allow the programmer to specify a waiting
period. However, as with sleep, join is dependent on the OS for
timing, so we should not assume that join will wait exactly as
long as we specify.
public void join()throws InterruptedException
public void join(long milliseconds)throws InterruptedException11

Thread Priority
Each thread have a priority. Priorities are represented by a
number between 1 and 10
3 constants defined in Thread class:
public static int MIN_PRIORITY
public static int NORM_PRIORITY
public static int MAX_PRIORITY
Default priority of a thread is 5 (NORM_PRIORITY). The
value of MIN_PRIORITY is 1 and the value of
MAX_PRIORITY is 10.
12

Interrupting a Thread
An interrupt is an indication to a thread that it should stop
what it is doing and do something else. It's up to the
programmer to decide exactly how a thread responds to an
interrupt, but it is very common for the thread to terminate.
Methods
public void interrupt()
public static boolean interrupted()
public boolean isInterrupted()
13

Synchronization in Java
Java synchronized method
If you declare any method as synchronized, it is known as
synchronized method. Synchronized method is used to lock an
object for any shared resource.
When a thread invokes a synchronized method, it
automatically acquires the lock for that object and releases it
when the thread completes its task.
14

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Java thread

1. JAVA Thread Prepared by Miss. Arati A. Gadgil

2. Thread There are two ways to create a thread 1.By extending Thread class 2. By implementing Runnable interface 2

3. Thread States 1.New 2.Runnable 3.Running 4.Non-Runnable (Blocked) 5.Terminated 3

4. 4 New Runnable Running Terminated Non-Runnable Blocked start() run() Sleep,IO complete Sleep,bock,IO wait

5. Constructors of Thread class Thread() Thread(String name) Thread(Runnable r) Thread(Runnable r,String name Methods of Thread class public void run() is used to perform action for a thread. public void start() starts the execution of the thread.JVM calls the run() method on the thread. public void sleep(long miliseconds) Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds. 5

6. public int getPriority() returns the priority of the thread. public int setPriority(int priority) changes the priority of the thread. public String getName() returns the name of the thread. public void setName(String name) changes the name of the thread. public Thread currentThread() returns the reference of currently executing thread. public boolean isAlive() tests if the thread is alive. public void stop() is used to stop the thread. 6

7. Runnable Interface Runnable interface have only one method named run(). public void run() is used to perform action for a thread. 7

8. class Multi extends Thread { public void run() { System.out.println("thread is running..."); } public static void main(String args[]) { Multi t1=new Multi(); t1.start(); } } 8

9. class Multi implements Runnable { public void run() { System.out.println("thread is running..."); } public static void main(String args[]) { Multi3 m1=new Multi3(); Thread t1 =new Thread(m1); t1.start(); } } 9

10. sleep() method Thread.sleep causes the current thread to suspend execution for a specified period. public static void sleep(long miliseconds)throws InterruptedException public static void sleep(long miliseconds, int nanos)throws InterruptedException 10

11. join() method The join method allows one thread to wait for the completion of another. Overloads of join allow the programmer to specify a waiting period. However, as with sleep, join is dependent on the OS for timing, so we should not assume that join will wait exactly as long as we specify. public void join()throws InterruptedException public void join(long milliseconds)throws InterruptedException11

12. Thread Priority Each thread have a priority. Priorities are represented by a number between 1 and 10 3 constants defined in Thread class: public static int MIN_PRIORITY public static int NORM_PRIORITY public static int MAX_PRIORITY Default priority of a thread is 5 (NORM_PRIORITY). The value of MIN_PRIORITY is 1 and the value of MAX_PRIORITY is 10. 12

13. Interrupting a Thread An interrupt is an indication to a thread that it should stop what it is doing and do something else. It's up to the programmer to decide exactly how a thread responds to an interrupt, but it is very common for the thread to terminate. Methods public void interrupt() public static boolean interrupted() public boolean isInterrupted() 13

14. Synchronization in Java Java synchronized method If you declare any method as synchronized, it is known as synchronized method. Synchronized method is used to lock an object for any shared resource. When a thread invokes a synchronized method, it automatically acquires the lock for that object and releases it when the thread completes its task. 14

15. Thank You 15

Java thread

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