public  void input(){
                 int command;
        while(true){
            try {
                command = System.in.read();
                if(command==1){
                    break;
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

public  void input(){
                 int command;
        while(true){
            try {
                command = System.in.read();
                if((char)command=='1'){//注意这行
                    break;
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

------解决方案--------------------

Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();