my goal is to generate a random number every 10 seconds and store in arraylist. when I generate the new number every 10 second I want to update the previous number from the arraylist. currently it gets the first number current num in main method but when I store after 10 second i'm not geting the update current number. NOTE: ***I want the Runnable to be in the arraylist method. Not in main method. my goal is to send the arraylist that has the update number***
import java.util.ArrayList;
import java.util.Random;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
public class Main
{
public static void main(String[] args) throws Exception
{
ScheduledExecutorService executor =
Executors.newScheduledThreadPool(1);
//schedule thread for evry 10 seconds
//executor.schedule(new sampleCallableExample(), 1,
TimeUnit.MILLISECONDS);
executor.scheduleAtFixedRate(new sampleCallableExample(), 0, 10,
TimeUnit.SECONDS);
System.out.println("array size:"+globals.Update.size());
for(int x=0;x {
System.out.println("Current Num = " + globals.Update.get(x));
}
}
}
import java.util.ArrayList;
public class globals
{
public static ArrayList Update = new ArrayList();
}
sampleCallableExample.java :
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
import java.util.Random;
class sampleCallableExample implements Runnable
{
public static int genrand()
{
Random number = new Random();
//generate random number
int rand = number.nextInt(1000);
//return generated random number
return rand;
}
public Object call() throws Exception
{
//ArrayList Update = new ArrayList();
int CurrentNum = genrand();
System.out.println("generate number ==== " + CurrentNum);
globals.Update.clear();
globals.Update.add(CurrentNum);
System.out.println("Number added");
return globals.Update;
}
// As seen run wraps call object
public void run()
{
try
{
Object o = call();
//System.out.println("Returned " + o);
}
catch (Exception e)
{
e.printStackTrace();
}
}
public sampleCallableExample()
{
try
{
run();
}
catch(Exception e)
{
}
}
}
Current Output:
generate number ==== 809
Number added
array size:1
Current Num = 809
generate number ==== 6
Number added
generate number ==== 107
Number added
It should be :
generate number ==== 809
Number added
array size:1
Current Num = 809
generate number ==== 6
Number added
array size:1
Current Num = 6
generate number ==== 107
Number added
array size:1
Current Num = 107
NOTE: ***I want the Runnable to be in the arraylist method. Not in main method. my goal is to send the arraylist that has the update number***I would apperciate any help.
Hi,
Please find the update code according to the sample output:
================================================
Main.java
================================================
import java.util.ArrayList;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class Main {
public static void main(String[] args) throws
Exception {
ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
//schedule thread for evry 10 seconds
//executor.schedule(new sampleCallableExample(), 1,
TimeUnit.MILLISECONDS);
executor.scheduleAtFixedRate(new
sampleCallableExample(), 0, 10, TimeUnit.SECONDS);
}
}
class globals {
public static ArrayList Update = new ArrayList();
}
==============================================
sampleCallableExample.java
==============================================
import java.util.Random;
public class sampleCallableExample implements Runnable {
public static int genrand() {
Random number = new Random();
//generate random number
int rand =
number.nextInt(1000);
//return generated random number
return rand;
}
public Object call() throws Exception {
//ArrayList Update = new ArrayList();
int CurrentNum = genrand();
System.out.println("generate number
==== " + CurrentNum);
globals.Update.clear();
globals.Update.add(CurrentNum);
System.out.println("Number
added");
System.out.println("array size:" +
globals.Update.size());
System.out.println("Current Num = "
+ globals.Update.get(0));
return globals.Update;
}
// As seen run wraps call object
public void run() {
try {
Object o =
call();
//System.out.println("Returned " + o);
} catch (Exception e) {
e.printStackTrace();
}
}
public sampleCallableExample() {
try {
run();
} catch (Exception e) {
}
}
}
Sample output:
I hope this helps you!!
Thanks
my goal is to generate a random number every 10 seconds and store in arraylist. when...
my goal is to generate a random number every 10 seconds and store in arraylist. when I generate the new number every 10 second I want to update the previous number from the arraylist. currently it gets the first current number in main method but when I store after 10 second i'm not getting the update current number. I would appreciate any help. NOTE: ***I want the Runnable to be in the same class, Not in main method. my goal...
my goal is to generate a random number every 10 seconds and store in arraylist. when I generate the new number every 10 second I want to update the previous number from the arraylist. currently it gets the first current number in main method but when I store after 10 second i'm not getting the update current number. I would appreciate any help. NOTE: ***I want the Runnable to be in the same class, Not in main method. my goal...
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