Question

好吧，例如，程序会询问用户输入，然后它会产生一些输出然后就完成了，但是如果用户想要通过main方法，如何让它再次循环呢？

这是我的代码：

public static void main(String[] args) {
    Scanner sc = new Scanner(System. in );
    System.out.print("Please enter the first name of the person you would love to know about : ");
    String hisName = sc.next();
    printSomeInfoAbout(hisName);
}

如果用户再次决定，我将如何让它再次运行？

Answer 1

String x=null; 
Scanner sc = new Scanner(System. in ); 
String hisName=null; 
 do{    
    System.out.print("Please enter the first name of the person you would love to know about : ");
    hisName = sc.next();
    printSomeInfoAbout(hisName);
    System.out.print("y/n");
    x=sc.next();
    }while(x.equals("y"));

Answer 2

  public static void main(String[] args) {
    Scanner sc = new Scanner(System. in );
    System.out.print("Please enter the first name of the person you would love to know about : ");
    String hisName = sc.next();
        printSomeInfoAbout(hisName);

  System.out.print("AGAIN (Y/N) : ");  // ask the input from user
    String var= sc.next();
   if(var.equalsIgnoreCase("Y")){// Matches "Y" or "y"
      main(null); // if input is Y then call main again. 
   }
}

Answer 3

boolean exit = false;

while(!exit){
    Scanner sc = new Scanner(System. in );
    System.out.print("Please enter 'exit' to exit or, the first name of the person you would love to know about : ");
    String hisName = sc.next();
    if(!"exit".equals(hisName)) {
        printSomeInfoAbout(hisName);
    }else{
         exit = true;
    }
}

Answer 4

如果用户选择输入其他名称，则创建一个获取输入并调用它的方法

Answer 5

一个简单的循环，它将检查用户将空字符串作为它将退出的第一个名称。

public static void main(String[] args) {
    Scanner sc = new Scanner(System. in );
    do {
        System.out.print("Please enter the first name of the person you would love to know about : ");
        String hisName = sc.next();
        if (hisName.equals("")) {
            printSomeInfoAbout(hisName);
        }
    } while (!hisName.equals(""));
}

Answer 6

请查看以下代码段，它可能对您有所帮助..

public static void main（String [] args）{

    String name;
    Scanner scn = new Scanner(System.in);

    boolean flag = false;

    do {

        System.out.println("Please enter the first name of the person you would love to know about : ");
        name = scn.next();
        System.out.println("Your friend " +name+ " is a great guy..!");
        System.out.println();
        System.out.println("Enter 1 to continue giving other" +
                " names or Enter 2. to quit");
        System.out.println();

        int choice = scn.nextInt();
        if( choice == 1 ) {
            flag = true;
        } else {
            System.out.println("ThankU.. Bye");
            flag = false;
        }

    } while(flag);


}

如何以某种方式循环我的主方法？

6 个答案: