How would you execute this on VSCode?-CodePudding

I've found the following code online but don't know how to run it on IDE as I'm new to Java could you please help.

class Figure {
  void display() { System.out.print("Figure "); }
}
class Rectangle extends Figure {
  void display() { System.out.print("Rectangle "); }
  void display(String s){ System.out.print(s); } 
}
class Box extends Figure {
  void display() { System.out.print("Box ");  }
  void display(String s){ System.out.print(s); }
} 

Figure f = new Figure();
Rectangle r = new Rectangle();
Box b = new Box();
f = r;
((Figure) f).display();
f = (Figure) b;
f.display();

I tried creating a class and copy-pasting the code but couldn't manage to produce any output. Super stuck and am still a novice. Doing it by hand I think it should output Rectangle Box.

CodePudding user response：

Figure.java:

class Figure {
  void display() { System.out.print("Figure "); }
}

Rectangle.java:

class Rectangle extends Figure {
  void display() { System.out.print("Rectangle "); }
  void display(String s){ System.out.print(s); } 
}

Box.java:

class Box extends Figure {
  void display() { System.out.print("Box ");  }
  void display(String s){ System.out.print(s); }
}

The rest code should be in main method and you can put main method in any one of the above .java files. I put it in Figure.java, please have a try.