两个做你想做的事情的例子：
第一个例子：

Scanner sc = new Scanner(System.in);
    String input = null;
    
    do {
        System.out.println("Type X to exit and hit enter");
        input = sc.next();
    } while(!input.equalsIgnoreCase("x"));
    
    sc.close();

第二个例子：

Scanner sc = new Scanner(System.in);
    String input = null;
    do {

        System.out.println("Type X to exit and hit enter");
        input = sc.next();
        
        if (input.equalsIgnoreCase("x")) {
            break;
        }
    } while(true);

    sc.close();

将控制台代码添加到while-loop;按“a”或“A”退出。

Scanner sc = new Scanner(System.in);
   //Type in "a" to end
    while (!sc.next().equalsIgnoreCase("a")) {
          // console code here
    }
    System.out.println("Exiting");