好了，我的程序“完成”到我无法解决这个简单问题的程度。
我懂了：
package hotel;
import java.util.Scanner;
/**
*
* @author Defalt
*/
public class Hotel {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Prices prices = new Prices();
Scanner user_in = new Scanner(System.in);
String method;
boolean taken = false;
boolean taken2 = false;
boolean taken3 = false;
boolean again = true;
//***********Introduction to the hotel*************
System.out.println("Welcome to Hotel Vermond's Heaven!");
System.out.println("We are happy to see that you would like to stay with us.");
//***********Creating of a Loop*************
do {
System.out.println("Please, type which room you would like to book: ");
System.out.println("Single Bed, Double Bed, President Suit");
method = user_in.nextLine();
//***********Choices of Rooms and Question to book another one*************
if ("Single Bed".equals(method)) {
System.out.println(prices.describe1());
if ("y".equals(user_in.nextLine())){
if(taken=true){
System.out.println("We are sorry, this room is already booked. Please choose another one");
}else again=true;
} else again=true;
} else if ("Double Bed".equals(method)){
System.out.println(prices.describe2());
if ("y".equals(user_in.nextLine())){
taken2 = true;
again=true;
} else again=true;
} else if ("President Suit".equals(method)){
System.out.println(prices.describe3());
if ("y".equals(user_in.nextLine())){
taken3 = true;
again=true;
} else again=true;
} else {
System.out.println("Please choose one of the rooms above.");
}
System.out.println("Would you like to book another Room(y/n)\n");
//***********Outbreak if User declines another booking*************
//***********Otherwise redo the whole process*************
if ("y".equals(user_in.nextLine())){
again=true;
} else{
break;
}
}while(again);
System.out.println("Thank you and goodbye!");
}
}
我的另一堂课是这样的：
package hotel;
import java.util.Scanner;
/**
*
* @author Defalt
*/
public class Prices {
Scanner user_in = new Scanner(System.in);
int price1 = 300;
int price2 = 800;
int price3 = 2500;
//***********Information of the Room including Validation Question*************
public String describe1() {
return
"You Choose the Single Bed.\n\tThis room Contains 1 Bed, 1 Fridge a Bathroom but no View on the Ocean.\n\tThis room will cost CHF " + price1 + ".-.\n\tWould you like to book this room?(y/n)";
}
public String describe2() {
return
"You Choose the Double Bed.\n\tThis room Contains 1 Queen-size Bed, 1 Fridge a bathroom, an Icemaker but no View on the Ocean.\n\tThis room will cost CHF " + price2 + ".-.\n\tWould you like to book this room?(y/n)";
}
public String describe3() {
return
"You Choose the President Suit.\n\tThis room Contains 1 King-size Bed, 1 Fridge, XXL Bathroom, Private Entertainment-System, 65inch Flatscreen and a Balcony with View on the Ocean.\n\tThis room will cost CHF " + price3 + ".-.\n\tWould you like to book this room?(y/n)";
}
}
如您所见，我已尝试将
Single Bed保留为预留空间。 System.out.println("We are sorry, this room is already booked. Please choose another one");甚至在第一次预订时就显示。为什么即使我的
taken布尔值的初始值为false？我还有什么其他选择可以使我的想法可行？
PS !：我认为我是第一次使用它，但是无论我关闭程序并重新启动它的次数，它都能保持原样。 （只是旁注）
最佳答案
你需要改变
if(taken=true){
System.out.println("We are sorry, this room is already booked. Please choose another one");
至
if(taken==true){
System.out.println("We are sorry, this room is already booked. Please choose another one");
注意if条件中的double等于。这将检查
taken的值，而不是始终将其设置为true，这是当前正在发生的情况。另外，由于
taken已经是布尔值，因此可以将其简化为：if(taken){
System.out.println("We are sorry, this room is already booked. Please choose another one");
如果您修复了格式和缩进，它可能会帮助您解决这些问题。我倾向于避免随时忽略花括号。这通常是Java标准格式：
if(condition) {
if(condition) {
// do the thing
}
else {
// do the other thing
}
}
else if(condition) {
// do another thing
}
else {
// do the third thing
}
注意相同嵌套级别的ifs / else ifs / elses如何也保持在相同的缩进级别。这有助于使它们保持笔直。
编辑：
我想指出的另一件事是您拥有
again布尔值，但您没有使用它。如果用户完成操作，则不必使用break循环，而应使用应该使用的again布尔值并将其设置为false。这将导致循环条件失败并顺利退出循环。使用break很难看。