两种单例模式区别

两种单例模式:

public class QQInfoManager {
    private static final QQInfoManager mInstance = new QQInfoManager();
       
    private QQInfoManager() {
    }
    public static QQInfoManager getInstance() {
        return mInstance;
    }
    public boolean funcA() {
        return true;
    }
                                                                                                                                                        
    ......
}public class QQInfoManager {