Question

我想循环我的程序重复如果用户输入y程序会一遍又一遍地重复，但如果用户最后输入n，程序将停止

import java.util.Scanner;
public class ReverseIt {

public static void main(String[] args) {

    Scanner sc = new Scanner (System.in);

    String name;
    System.out.println("Input Name");
    name = sc.nextLine();

    StringBuilder rev = new StringBuilder(name);


    System.out.println("NAME: "+name+"\n");

    System.out.println("REVERSE:" +rev.reverse()+"\n");

    System.out.println("Would you like to do it again?(Y/N)\n");

    char repeat;

    repeat = sc.next().charAt(0);


    if(repeat == 'n'){
        System.out.println("Program  Stopped");
    }
        while(repeat == 'y'){
            System.out.println("Input Name");
            name = sc.nextLine();
            System.out.println("NAME: "+name+"\n");

            System.out.println("REVERSE:" +rev.reverse()+"\n");

            System.out.println("Would you like to do it again?(Y/N)\n");
        }

}

Answer 1

我会将代码分成单独的函数，如果扫描程序返回＆＃34; y＆＃34;则调用该函数。例如：

public static void main(String[] args) {
function();
}
public static void function(){
Scanner sc = new Scanner (System.in);

String name;
System.out.println("Input Name");
name = sc.nextLine();

StringBuilder rev = new StringBuilder(name);


System.out.println("NAME: "+name+"\n");

System.out.println("REVERSE:" +rev.reverse()+"\n");

System.out.println("Would you like to do it again?(Y/N)\n");

char repeat;

repeat = sc.next().charAt(0);


if(repeat == 'n'){
    System.out.println("Program  Stopped");
}
    if(repeat == 'y'){

function();

    }

}

希望有所帮助

Answer 2

基本上，您可以使用do-while循环...

do {
    //...
    System.out.println("Would you like to do it again?(Y/N)\n");
    String repeat = sc.next();
} while (repeat.equalsIgnoreCase("y"));

有关详细信息，请参阅The while and do-while Statements ...

Answer 3

因为，问题必须要问一次，必须使用do while语句来实现你想要的。

代码：

public static void main(String... args) {

    String name,finish;
    do{
    System.out.println("Input Name"); 
    Scanner sc = new Scanner(System.in);
    name = sc.nextLine();
    StringBuilder rev = new StringBuilder(name);
    System.out.println("NAME: " + name + "\n");
    System.out.println("REVERSE:" + rev.reverse() + "\n");
    System.out.println("Would you like to do it again?(Y/N)\n");
    finish = sc.next();
    }while(finish.equalsIgnoreCase("Y"));

}

重复该计划？

3 个答案: