创建对象并在构造函数中使用它

Question

Say we have a class called Maze . Now suppose that we have another class called MazeSolver . So in order to create the Maze object in MazeSolver for the reason of using the methods from Maze, we create private Maze maze . Then within the constructor of MazeSolver , we also write public MazeSolver(Maze maze) . My question is, why do we have to do both? What is the philosophy behind the idea? Why can't we do one or the other opposed to doing both is I guess where I am confused.

Answer 1

Well there is the field/variable where the Maze reference is stored:

private Maze maze;

And there is the constructor where the Maze reference is passed and set

public MazeSolver(Maze maze) { this.maze = maze; }

Beyond that, you need to ask a more specific question.

Answer 2

Here you have two options first one is you can use like this

public MazeSolver(Maze maze) { 
this.maze = maze; 
}

second option is

public MazeSolver() { 
maze = new maza();; 
}

Actually your requirement is you need to use maza behavior so in that case you need one instance of maza class( if those method are non-static). that's why you need to initialize or you assign object to maza

I hope this will help you to understand your requirement