32
任务
Java Collections, 第 5 级, 课程 10
What is ClassLoader?
Implement the getAllAnimals method.
The method's pathToAnimals parameter is the absolute path to the directory where the compiled classes are saved.
The path doesn't necessarily have a "/" at the end.
Not all classes inherit the Animal interface.
8
任务
Java Collections, 第 5 级, 课程 10
extends vs super
All of the methods add the source to the destination.
Add ?, extends, and super where needed:
1) methodOne must work with the same type;
2) methodTwo must add any descendants of T to a list that can only store T objects.
8
任务
Java Collections, 第 5 级, 课程 10
Wildcards for collections
The Solution class has 4 methods for working with lists:
sum - Sums up all numeric elements of the list,
multiply - Multiplies all numeric elements of the list,
concat - Concatenates all elements of the list into a single String.