Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Really, you're asking about the <strong>Factory</strong> pattern or a <strong>dependency injection</strong> container such as Spring.</p> <p>Of course you can call the methods on an interface, the question is <strong>how you get the instance</strong>. That of course has to be specified, coded or configured somewhere. Configuration is preferable if there could ever be more than one in the future.</p> <p>Thus, more of a real example:</p> <pre><code>public interface MovementStrategy { public Move selectMove (Actor actor, ActorSituation theirSituation); } public class MonsterTypes { public static MonsterType GOBLIN = new MonsterType( "goblin", new AttackMover(1.2)); public static MonsterType TROLL = new MonsterType( "troll", new AttackMover(0.45)); public static MonsterType DEER = new MonsterType( "deer", new FleeMover(2.0)); // useful to have, also. public static List&lt;MonsterType&gt; getAllRegisteredTypes(); public static class MonsterType { protected String name; protected MovementStrategy moveStrategy; // TODO -- getters &amp; setters for all properties. // constructor. public MonsterType (String name, MovementStrategy moveStrategy) { this.name = name; this.moveStrategy = moveStrategy; } } } public class AttackMover implements MovementStrategy { // SPEC: generally move towards/attack PC, with varying speeds. } public class FleeMover implements MovementStrategy { // SPEC: generally run away from PCs. } </code></pre> <p>This isn't probably a perfect design -- it conflates "movement" (aka goal-seeking) with the actor's turn/actions overall -- but hopefully it gives you some more idea.</p>
    singulars
    1. This table or related slice is empty.
    1. POHow can you call a class that is implementing a certain interface without knowing its name?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USThomas W
    1. USThomas W
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POHow can you call a class that is implementing a certain interface without knowing its name?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COI have 2 questions : 1. How can you have arguments in the construcotr? 2. It doesn't let me initilaise the interface(MonsterType = new MonsterType())
      singulars
      1. PO
      1. USsplitgames
    2. COMonsterType should be JavaBean-style, or with chained setters.. and should have a constructor. But this is intended to be concise/ outline, for the sake of example -- so it does not include all these.
      singulars
      1. PO
      1. USThomas W
    3. COIf you designed `MonsterFactory` to load from XML or via Spring instead of hardcoded type constants, you could have the MonsterTypes load & register from config. In such a __configuration-based__ approach, the movement strategies (and other configurable strategies/or components) would ultimately be loaded by __reflection__. The Java classloader & Class.forName() would do the work, loading configured classes by name.
      singulars
      1. PO
      1. USThomas W
 

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