Question

Here is a brief code snippet:

someMethod ClassA getClassA() {
  List<ClassA.ClassB> classAType = Lists.newArrayList();
  //Now classAType is loaded with stuff here
  return ClassA.load(classAType.toArray(new ClassA.ClassB[classAType.size()]));
}

public abstract class ClassA {
  //Constructor
  public static abstract class ClassB {
    //some method
  }
}

The part which I don’t understand is the return statement.I wanted to know what does ClassA.ClassB[classAType.size()] imply

Answer 1

The getClassA() method first creates a list with ClassA.ClassB objects returned by Lists.newArrayList(). Then, it returns ClassA by calling a static method ClassA.load() passing one parameter: an empty array of type ClassA.ClassB with the same size as the classAType.

This piece of code:

classAType.toArray(new ClassA.ClassB[classAType.size()])

may look a bit complicated but it just creates an array containing all elements from the classAType list.