Question

public class Game{

public void players() { System.out.println(“1 or more”); }

}

public class Chess extends Game {

public void boardSize() { System.out.println(“8 by 8”); }
public void players() { System.out.println(“2”); }

}

public class ThreeDChess extends Chess{

public void boardSize() {System.out.println(“7 levels”); }
public void hasMoveableBoard() { System.out.println(“true”); }

}

Assume that these statements have already executed:

Game g = new Game();
Chess c = new Chess();
ThreeDChess t = new ThreeDChess();

Object og = g;
Game gc = c;
Game gt = t;

// Add new statements here ONE AT A TIME

I recommend copying the questions below into a text editor and then typing in your answers.

1) What are the static and dynamic types for the variables

og
gc
gt

2) Explain what would happen if each of the following statements were inserted ONE AT A TIME in the spot marked above. Answer the following questions for each statement:

Would the statement cause a syntax error?

If not, what are the static and dynamic types of the variable declared?

Game gx = gc; // Answer:
Game gx = og; // Answer:
Game gx = (Game)og; // Answer:
Chess cx = (Chess)gt; // Asnwer:
ThreeDChess tx = (ThreeDChess)gc; //Answer:

3) Finally, explain what would happen if each of the following statements were inserted ONE AT A TIME in the spot marked above. Answer the following questions for each statement:

Would the statement cause a syntax error?

If not, would the statement cause a ClassCastException?

If not, then explain what output is shown

gc.players(); // Answer:
og.players(); // Answer:
t.players(); // Answer:
((ThreeDChess)gc).hasMoveableBoard(); // Answer:
((ThreeDChess)gt).hasMoveableBoard(); // Answer: