java - 在 while 语句内使用嵌套的 if 和 else if 语句

Question

我在让我的程序执行我需要它执行的操作时遇到问题。代码中没有语法错误。

首先，我将程序设置为最多询问用户名字和姓氏 3 次，如果用户愿意，他们应该能够提前结束输入。

有没有办法可以将 System.out.print("Do you Want to add a new name (Y/N)");在 if 语句之外？因此，当我输入第三个名字或输入 2 个名字并输入 N 后，它就会停止。

任何帮助将不胜感激。

import java.util.Scanner;

public class SOF {


 public static void main(String test[]){




    @SuppressWarnings("resource")
    Scanner scanner = new Scanner (System.in);

    System.out.print("Do you want to add a new name (Y/N)");
    String newname = scanner.next();

    int AddName = 0;

    while (AddName < 3) {


        if (newname.equalsIgnoreCase("y")) 
        {


            System.out.println("Enter first name: ");
            String fname = scanner.next();

            System.out.println("Enter last name: ");
            String lname = scanner.next();

            AddName = AddName + 1;

            System.out.print("Do you want to add a new name (Y/N)");
            String newnamee = scanner.next(); //had to add an extra e, since I had two varibles
                                              // with the same time. This might be the issue.
                                              //I'm unsure though



        }

        else if (newname.equalsIgnoreCase("n")) {

            System.out.println("Goodbye");
            AddName = AddName + 3;
        }
    }
}

}

Answer 1

您可以将 System.out.print("Do you Want to add a new name (Y/N)"); 放在 while 循环的开头，如下所示:

import java.util.Scanner;

public class SOF {
public static void main(String test[]){
@SuppressWarnings("resource")
Scanner scanner = new Scanner (System.in);
int AddName = 0;

while (AddName < 3) {
System.out.print("Do you want to add a new name (Y/N)");
String newname = scanner.next();

    if (newname.equalsIgnoreCase("y")) 
    {
        System.out.println("Enter first name: ");
        String fname = scanner.next();
        System.out.println("Enter last name: ");
        String lname = scanner.next();
        AddName = AddName + 1;         

    }

    else if (newname.equalsIgnoreCase("n")) {
        System.out.println("Goodbye");
        AddName = AddName + 3;  //alternatively you can use break statement.
    }
   }
  }
 }