Answer / ashwin khandelwal

class DemoAlive extends Thread {
int value;

public DemoAlive(String str){
super(str);
value=0;
start();
}

public void run(){
try{
while (value < 5){
System.out.println(getName() + ": " + (value++));
Thread.sleep(250);
}
} catch (Exception e) {}
System.out.println("Exit from thread: " + getName());
}
}

public class DemoJoin{

public static void main(String[] args){
DemoAlive da = new DemoAlive("Thread a");
DemoAlive db = new DemoAlive("Thread b");
try{
System.out.println("Wait for the child threads to finish.");
da.join();

if (!da.isAlive())
System.out.println("Thread A not alive.");

db.join();

if (!db.isAlive())
System.out.println("Thread B not alive.");
} catch (Exception e) { }
System.out.println("Exit from Main Thread.");
}
}

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