我正在阅读Scala中的编程，我不明白以下句子(pdf p.112)：
Each singleton object is implemented as an instance of a synthetic class referenced from a
static variable,so they have the same initialization semantics as Java statics.
这是否意味着如果我在scala中有一个单例FooBar，编译器会创建一个名为FooBar $的类？
另外，作者的意思是“从静态变量引用”？有一个隐藏的静态变量在某个地方持有一些FooBar $类的引用？
我感谢任何帮助。
同样的“Scala编程”第31章更准确：
Java has no exact equivalent to a singleton object,but it does have static methods.
The Scala translation of singleton objects uses a combination of static and instance methods. For every Scala singleton object,the compiler will create a Java class for the object with a dollar sign added to the end.
For a singleton object named App,the compiler produces a Java class named App$.
This class has all the methods and fields of the Scala singleton object.
The Java class also has a single static field named MODULE$ to hold the one
instance of the class that is created at run time.
As a full example,suppose you compile the following singleton object:
object App {
def main(args: Array[String]) {
println("Hello,world!")
}
}
Scala will generate a Java App$ class with the following fields and methods:
$ javap App$
public final class App$ extends java.lang.Object
implements scala.ScalaObject{
public static final App$ MODULE$;
public static {};
public App$();
public void main(java.lang.String[]);
public int $tag();
}
That’s the translation for the general case.
