java.swing答答租车

/**
 * Created by xkfx on 2017/3/12.
 */
public class TestDada {
    public static void main(String[] args) {
        DadaImpl dada = new DadaImpl();
        dada.sayHello();
        // Here I say yes
        if (dada.getAnswer() == true) {
            dada.displayCars();
            // Here I choose the cars and comfirm
            if (dada.getOrder() == "confirm") {
                dada.showBill();
                // Here I comfirm the bill
            } else {
                dada.sayGoodbye();
            }
        } else {
            dada.sayGoodbye();
        }
    }
}

/**
 * Created by xkfx on 2017/3/12.
 */
public interface Dada {
    void sayHello();
    boolean getAnswer(); // 确认用户是否要租车
    void displayCars(); // 显示可出租的车的类型等信息
    String getOrder();  // 确认用户是否确认租车类型数量
    void showBill(); // 显示账单
    void sayGoodbye(); // 响应用户取消操作
}