public abstract class AbstractGuessGame {
private int number;
public void setNumber(int number) {
this.number = number;
}
public void start() {
showMessage("Welcome");
int guess;
do {
guess = getUserInput();
if(guess > number) {
showMessage("bigger than the goal number");
}
else if(guess < number) {
showMessage("smaller than the goal number");
}
else
showMessage("you win");
} while(guess != number);
}
protected abstract void showMessage(String message);
protected abstract int getUserInput();
}
import java.util.Scanner;
public class ConcreteGuessGame extends AbstractGuessGame {
private Scanner scanner;
public ConcreteGuessGame() {
scanner = new Scanner(System.in);
}
protected void showMessage(String message) {
System.out.println(message + "!");
}
protected int getUserInput() {
System.out.print("input a number: ");
return scanner.nextInt();
}
}
public class Test {
public static void main(String[] args) {
AbstractGuessGame guessGame =
new ConcreteGuessGame();
guessGame.setNumber(50);
guessGame.start();
}
}