The DefaultDAO class stores an instance of itself (as a Singleton) in the static variable instance, allowing access to that instance through the getInstance() method.

DefaultDAO 类在静态变量instance 中存储了它自己的一个实例（存储为Singleton），并允许通过getInstance()方法访问该实例。

youdao

This line of code creates a Singleton object and initializes the variable instance to refer to this object.

此行代码创建了一个Singleton对象并初始化变量instance来引用此对象。

youdao

The problem with this line of code is that the variable instance can become non-null before the body of the Singleton constructor executes.

这行代码的问题是：在Singleton构造函数体执行之前，变量instance可能成为非null的。

youdao

By simply having a member variable following the xyzService convention, Grails knows to inject the xyzService singleton.

只要拥有遵循xyzservice约定的成员变量，Grails就知道需要注入xyzService单体。

youdao

Since it is thread safe by design, you might cache it in a public static final variable, or wrap it in a singleton pattern after creation for later access.

因为根据设计它是线程安全的，创建它之后可以把它缓存在一个公共静态最终变量中，或者包装在单实例模式中以供以后访问。

youdao

To facilitate this, the plug-in class implements the singleton pattern: It stores a reference to itself in a private class variable.

为了使这一点更方便，插件类实现单模式（singletonpattern）：它在私有类变量中存储一个自身的引用。

youdao

To facilitate this, the plug-in class implements the singleton pattern: It stores a reference to itself in a private class variable.

为了使这一点更方便，插件类实现单模式（singletonpattern）：它在私有类变量中存储一个自身的引用。

youdao