Question

我构建了一个包含如下对象的对象：

public class TestThis implements Listener{

    private EventsManager eventsManager;
    private ConfigManager configManager;

    public TestThis() {
        eventsManager = new EventsManager();
        eventsManager.addListener(this);
        configManager = new ConfigManager(this);
    }

    public ConfigManager getConfigManager() {
        return configManager;
    }

    @Override
    public void configLoadedSuccessfully(Event event) {
        System.out.println(this.configManager); //OUTPUT NULL
        System.out.println(this.getConfigManager());//OUTPUT NULL
    }
}

configManager对象存在问题。在构造中，一切正常，但configLoadedSuccessfully是事件，configManager为null，其evrywhere为null。

侦听器代码：

public interface Listener{
    public void configLoadedSuccessfully(Event event);
}

Answer 1

我添加了一个函数，该函数开始加载配置并更改var的创建顺序。

    public class TestThis implements Listener{

    private EventsManager eventsManager;
    private ConfigManager configManager;

    public TestThis() {
        eventsManager = new EventsManager();
        configManager = new ConfigManager(this);
        eventsManager.addListener(this);
        configManager.load();
    }

    public ConfigManager getConfigManager() {
        return configManager;
    }

    @Override
    public void configLoadedSuccessfully(Event event) {
        System.out.println(this.configManager);
        System.out.println(this.getConfigManager());
    }
}

尽管变量已设置，但为null

1 个答案: