Databases
StackOverflow2013
Postsdbo
POAdd running thread objects in to an arraylist
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAdd running thread objects in to an arraylist
    primarykey
    data
    text
    <p>I am creating a small tank game using java. In that game, lifepacks and coin piles are generated at a random place on the game grid time to time. They both have a <strong>limited lifetime</strong> and <strong>after lifetime expires they are vanished from the field</strong>. When they visible on the grid, any tank can acquire them before vanish. And I want to keep the list of lifepack objects and coinpile objects in an <strong>ArrayList</strong> in order to access them by the game AI algorithm. I hope to implement the above concept as follows using simple java knowledge.</p> <p>Following is my LifePack class.CoinPile class behaves in a similar manner:</p> <pre><code>public class LifePack extends Thread{ public int healthBonus; public int lifetime; public String type; public Point location; public boolean visible; public LifePack(int x,int y,int lifetime){ location=new Point(x, y); this.lifetime=lifetime; this.type="health_pack"; this.visible=true; this.start(); } public void run(){ while(true){ if(this.lifetime&gt;0){ try{ Thread.sleep(1); if(lifetime%1000==0){ System.out.println("Life pack "+this.getId()+" will be disappeared in "+this.lifetime/1000+" s"); } this.lifetime--; } catch(Exception ex){ ex.printStackTrace(); } } else{ this.visible=false; this.interrupt(); break; } } System.out.println("Life pack visibility = "+this.visible); } } </code></pre> <p>I want to add the newly created LifePack Objects into an arraylist as follows:</p> <pre><code>public ArrayList&lt;LifePack&gt; lifePacks; lifePacks = new ArrayList&lt;LifePack&gt;(); lifePacks.add(new LifePack(x, y, lifeTime)); </code></pre> <p>Each time a new lifepack is created I add that lifepack object into the arraylist above. Once the lifepack's lifetime expires, I want to set the '<strong>visible</strong>' boolean variable in the above class to '<strong>false</strong>' so that I can check that variable for other purposes.</p> <p>But I don't get my desired output. Can I add running thread objects into an arraylist as above and keep the thread state running or Will I have to move to a different implementation? Please somebody help me to clear this out if there is a solution.</p> <p>Thank you.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USDeepal
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COYour architecture in general is not very good. You are creating a new Thread for each Lifepack, so if you have lets say 1000 Lifepacks you will have a 1000 Threads running. Threads come at a price (context switching, etc. pp.) and there is really no point why you should do this here. Instead, use one game logic thread (or maybe one designated thread for all lifepacks) and check each x ms if your lifepack is still alive and do some game logic. This is the usual game architecture approach.
      singulars
      1. POAdd running thread objects in to an arraylist
      1. USdirkk
    2. COThank you @dirkk. Actually my java knowledge is not that much good. I will try your idea. Thanks again.
      singulars
      1. POAdd running thread objects in to an arraylist
      1. USDeepal
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload