java使用Scanner从控制台读入

    public static void main(String[] args) {
    
    
        try {
    
    
            Scanner scanner = new Scanner(System.in);
            String str = null;
            do {
    
    
                str = scanner.nextLine();
                System.out.println(str);
            } while (!"exit".equals(str));

        } catch (Exception e) {
    
    
            e.printStackTrace();
        }
    }