[英]Java - force implementation of a method for each child of an abstract class
我有一个带有SendMessageAction之类的子类的抽象类Action。
我想在服务中运行这些操作,但是如何强制执行每个孩子?
例如,我想实现一个抽象方法:void run(Action action)和每个可能的Action的方法“ run”,如果缺少某些方法,则会出错。
任何想法 ?
如下所示的内容应该可以帮助您入门。 编码愉快!
动作.java
public abstract class Action {
protected abstract void runAction();
}
MessageSenderAction.java
public class MessageSenderAction extends Action {
public void runAction() {
//send message
}
}
SomeOtherAction.java
public class SomeOtherAction extends Action {
public void runAction() {
//do something else
}
}
ActionHandler.java
public class ActionHandler {
private final static ActionHandler INSTANCE = new ActionHandler();
private ActionHandler() {}
public static ActionHandler getInstance() {
return INSTANCE;
}
private List<Action> allActions = new ArrayList<Action>();
public void addAction(Action action) {
allActions.add(action);
}
public void runAllActions() {
for(Action action: allActions) {
//just to handle exception if there is any. Not to hamper other actions in case of any failures
try {
action.runAction();
} catch(Exception e) {
e.printStackTrace();
}
}
}
}
ActionDemo.java
public class ActionDemo {
public static void main(String... args) {
ActionHandler actionHandler = ActionHandler.getInstance();
Action msgSenderAction = new MessageSenderAction();
Action someOtherAction = new SomeOtherAction();
actionHandler.addAction(msgSenderAction);
actionHandler.addAction(someOtherAction);
actionHandler.runAllActions();
}
}
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