因此，正如图灵85所提到的，重新启动整个程序可能不是一个好办法。一般来说，你使用的是所谓的状态机。对于这个示例，可以使用while循环实现一个简单的示例。举个例子：

import java.util.Scanner;

public class foo  
{ 
    public static void main(String[] args) 
    { 
        Scanner scan = new Scanner(System.in);
        boolean running = true;
        while(running){

            System.out.println("enter a value, enter -1 to exit..."); 

            int value = scan.nextInt();

            if(value == -1){
                System.out.println("exiting");
                break;
            }else{
                System.out.println("do stuff with the value");
            }
        }
    } 
}

输出结果如下：

enter a value, enter -1 to exit...
1
do stuff with the value
enter a value, enter -1 to exit...
2
do stuff with the value
enter a value, enter -1 to exit...
4
do stuff with the value
enter a value, enter -1 to exit...
-1
exiting