如何让我的程序循环回到某个点，直到达到某个答案[重复]

Question

我正在学习高级编程课程，目前正在学习 Java。我们应该设计一家商店。我的部分代码遇到了一些麻烦。我决定开一家卖不同种类苹果的商店。如果您运行我的代码并输入苹果的名称以了解更多信息，程序将结束。我希望它循环回到询问您是否想了解任何一种苹果的部分。这是我目前所拥有的。

System.out.println("Bradley's Apple Store");
System.out.println(" ");
System.out.println("Today we have eight different kinds of apples.  They are Alderman apples, Akane apples, Akero apples, Alkeme apples, Ambrosia Apples, Allington Pippin apples, and American Summer Pearmain apples");
System.out.println(" ");
System.out.println("If you would like to hear about any of the kinds of apples, type in the name of the apple.  If you would just like to purchase apples, then type purchase.");

String input = scan.nextLine();                                                     //For information on the apples
if (input.equalsIgnoreCase("Alderman"))
    System.out.println("An English (possible Scottish) culinary apple, thought to have originated in the 1920s. $4.00/lb");
if (input.equalsIgnoreCase("Akane"))
    System.out.println("One of the best early-season apples, better known in the USA than Europe, but would appeal to European tastes too. $6.00/lb");
if (input.equalsIgnoreCase("Akero"))
    System.out.println("An heirloom apple variety from Sweden, quite widely grown in Scandanavia, very handsome fruit. $2.00/lb");
if (input.equalsIgnoreCase("Alkeme"))
    System.out.println("A very attractive early Cox-style apple, slightly sharper than Cox, sometimes known as Early Windsor. $9.00/lb");
if (input.equalsIgnoreCase("Ambrosia"))
    System.out.println("A sweet modern apple variety from western Canada, quite similar to Golden Delicious. Discovered as a chance seedling in an orchard in British Columbia. $7.00/lb");
if (input.equalsIgnoreCase("Allington Pippin"))
    System.out.println("A versatile English apple, with a strong pineapple-like flavour, useful for both cooking and eating. $3.00/lb");
if (input.equalsIgnoreCase("American Summer Pearmain"))
    System.out.println("An excellent early eating apple, also good for cooking. Medium size, yellow-green fruit is flushed and streaked red to purple red. Sweet, very juicy flesh. $25.00/lb");
if (input.equals("purchase"))
    System.out.println("What would you like to buy?: ");


}

}

感谢您的帮助。

Answer 1

您可以使用 while 循环检查直到用户输入“退出”

    while (true) {
        String input = scan.nextLine(); // For information on the apples

        /*
         *  Rest of your code
         */

        // break the loop if the user enters exit
        if (input.equalsIgnoreCase("exit"))
            break;
    }

Answer 2

您可以使用while 或do...while 循环。

boolean exitLoop = false;
do {
 String input = scan.nextLine(); //For information on the apples
 if (input.equalsIgnoreCase("Alderman")) {
  System.out.println("An English (possible Scottish) culinary apple, thought to have originated in the 1920s. $4.00/lb");
  exitLoop = true;
 }
 if (input.equalsIgnoreCase("Akane")) {
  System.out.println("One of the best early-season apples, better known in the USA than Europe, but would appeal to European tastes too. $6.00/lb");
  exitLoop = true;
 }
 if (input.equalsIgnoreCase("Akero")) {
  System.out.println("An heirloom apple variety from Sweden, quite widely grown in Scandanavia, very handsome fruit. $2.00/lb");
  exitLoop = true;
 }
 if (input.equalsIgnoreCase("Alkeme")) {
  System.out.println("A very attractive early Cox-style apple, slightly sharper than Cox, sometimes known as Early Windsor. $9.00/lb");
  exitLoop = true;
 }
 if (input.equalsIgnoreCase("Ambrosia")) {
  System.out.println("A sweet modern apple variety from western Canada, quite similar to Golden Delicious. Discovered as a chance seedling in an orchard in British Columbia. $7.00/lb");
  exitLoop = true;
 }
 if (input.equalsIgnoreCase("Allington Pippin")) {
  System.out.println("A versatile English apple, with a strong pineapple-like flavour, useful for both cooking and eating. $3.00/lb");
  exitLoop = true;
 }
 if (input.equalsIgnoreCase("American Summer Pearmain")) {
  System.out.println("An excellent early eating apple, also good for cooking. Medium size, yellow-green fruit is flushed and streaked red to purple red. Sweet, very juicy flesh. $25.00/lb");
  exitLoop = true;
 }
 if (input.equals("purchase")) {
  System.out.println("What would you like to buy?: ");
  exitLoop = true;
 }
}
while (!exitLoop);