Exercise – 10 (Threads)

Exercise – 10 (Threads)

a). Write a JAVA program that creates threads by extending Thread class . First thread display
"Good Morning " every 1 sec, the second thread displays "Hello"every 2 seconds and the
third display Welcome" every 3 seconds , (Repeat the same by implementing Runnable)

import java.io.*;
class A extends Thread
{
synchronized public void run()
{
try
{
while(true)
{
sleep(1000);
System.out.println("good morning");
}
}
catch(Exception e)
{ }
}
}
class B extends Thread
{
synchronized public void run()
{
try
{
while(true)
{
sleep(2000);
System.out.println("hello");
}
}
catch(Exception e)
{ }
}
}
class C extends Thread
{
synchronized public void run()
{
try
{
while(true)
{
sleep(3000);
System.out.println("welcome");
}
}
catch(Exception e)
{ }
}
}
class Threadmsgs
{
    public static void main(String args[])
    {
        A t1=new A();
        B t2=new B();
        C t3=new C();
        t1.start();
        t2.start();
        t3.start();
    }
}

b). Write a program illustrating isAlive and join ()

public class AliveJoin extends Thread 

{ 

public void run() 

{ 

System.out.println("ABDUL KALAM "); 

try 

{ 

Thread.sleep(300); 

} 

catch (InterruptedException ie) 

{ } 

System.out.println("SUBHASH CHANDRABOSH "); 

} 

public static void main(String[] args) 

{ 

AliveJoin c1 = new AliveJoin(); 

AliveJoin c2 = new AliveJoin(); 

c1.start(); 

c2.start();

System.out.println(c1.isAlive());

System.out.println(c2.isAlive());

try 

{ 

c1.join(); // Waiting for c1 to finish 

} 

catch (InterruptedException ie) 

{ } 

} 

}

c). Write a Program illustrating Daemon Threads.

import java.io.*;

public class DaemonThread extends Thread 

{ 

public DaemonThread(String name)

{ 

super(name); 

} 

public void run() 

{  

if(Thread.currentThread().isDaemon()) 

{  

            System.out.println(getName() + " is Daemon thread");  

}  

else

{  

System.out.println(getName() + " is User thread");  

}  

}  

public static void main(String[] args) 

{  

        DaemonThread t1 = new DaemonThread("t1"); 

        DaemonThread t2 = new DaemonThread("t2"); 

        DaemonThread t3 = new DaemonThread("t3");

        t1.setDaemon(true);                

        t1.start();  

        t2.start(); 

        t3.setDaemon(true);  

        t3.start();         

    }  

}