利用策略模式。
用Java术语：
public interface Strategy {
void execute();
}
public class SomeStrategy implements Strategy {
public void execute() {
System.out.println("Some logic.");
}
}
使用方法如下：
Map<String, Strategy> strategies = new HashMap<String, Strategy>();
strategies.put("strategyName1", new SomeStrategy1());
strategies.put("strategyName2", new SomeStrategy2());
strategies.put("strategyName3", new SomeStrategy3());
// ...
strategies.get(s).execute();
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