Thread: Timer expires invoke method

Hi ,
i want to set a timer for 5 secs and once the timer wakes up i want to invoke a method . i am checking a boolean flag of class b,once set i want to invoke the method . but the logic is not quite working ,any other simple method to do this thing??

i have implemented this using a thread...

 
public class a {
 
	int seconds; 
	Thread timer;
	static b obj=new b();
 	public static void main(String[] args) {
 
 
 
 		Thread t1=new Thread(obj);
t1.start();
 
while(true){
 
//	System.out.println(b.flag);            //..................>if i use this line the code works fine ??
	if(b.flag)
	{System.out.println("timer was set");
	System.out.println("this should be true"+b.flag);
		b.flag=false;
		System.out.println("this should be false"+b.flag);
	System.out.println("method");
	System.out.println("timer cleared");
 
	}
 
 
 
}
 
 	}
}
 
 
public class b implements Runnable{
	int seconds;
	public static boolean flag=false;
 
 
	public void run() {
		while(true)
			{
			System.out.println("flag being set");
 
			flag=true;
			 	//	try{
			 			try {
							Thread.sleep(5000);
						} catch (InterruptedException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
			 		//}catch(Exception e){}
 
 	}}
}

Have you looked at using the Swing Timer class. It could be easier.

but the logic is not quite working

Can you explain what happens or doesn't happen?

the logic

if(b.flag)
{System.out.println("timer was set");
System.out.println("this should be true"+b.flag);
b.flag=false;
System.out.println("this should be false"+b.flag);
System.out.println("method");
System.out.println("timer cleared");

}

is not performed even the flag is being set

is not performed even the flag is being set

What is the value of b.flag that is printed out when the println is uncommented?

What was printed out when you ran it?

Here's what I get when I execute it:


Running: D:\Java\jdk1.6.0_25\jre\bin\java.exe -Xmx512M -classpath D:\JavaDevelopment;. a

flag being set
timer was set
this should be truetrue
this should be falsefalse
method
timer cleared
flag being set
timer was set
this should be truetrue
this should be falsefalse
method
timer cleared
flag being set
timer was set
this should be truetrue
this should be falsefalse
method
timer cleared
flag being set
timer was set
this should be truetrue
this should be falsefalse
method
timer cleared

I have tried this on Eclipse and Netbeans IDE .
I got this :


flag being set
timer was set
this should be truetrue
this should be falsefalse
method
timer cleared
flag being set
flag being set
flag being set
flag being set
flag being set

Sorry, it seems to work for me.