java - 如何重新启动java程序在这里

Question

import java.util.Scanner;

public class App {

  public static void main(String[] args) {

    System.out.println("Please enter your official name.");

    Scanner typing = new Scanner(System.in);
    String name = typing.nextLine();

    while (!name.matches("[a-zA-Z]")) {
      System.out.println("Please enter your official name.");
      name = typing.nextLine();
    }
    if (name.length() >= 4)
      System.out.println("Your name is: " + name);

    else
      System.out.println("So your name is less than four characters.");

  }

}

这里如何重新启动程序!PS:我是java初学者

Answer 1

一旦 main 方法退出，应用程序就会退出。将代码放入另一个方法中并在 while 循环内调用它。

public static void main(String[] args) {
    while(true){
        process();
    }
}

static void process(){
    System.out.println("Please enter your official name.");

    Scanner typing = new Scanner(System.in);
    String name = typing.nextLine();

    while (!name.matches("[a-zA-Z]")) {
      System.out.println("Please enter your official name.");
      name = typing.nextLine();
    }
    if (name.length() >= 4)
      System.out.println("Your name is: " + name);

    else
      System.out.println("So your name is less than four characters.");
}

这将无限地一次又一次地运行该程序。如果你想退出，请在cmd中按Ctrl + C或者你可以使用，

System.exit(0);

代码中的某个位置。