java实现从键盘接收一个输入字符

public static void main(String[] args) throws IOException {
        char ch = (char)System.in.read();
        char state = ' ';
        switch (ch) {
            case 'a':
                state = 'j';
                break;
            case 'b':
                state = 'k';
                break;
            default:
                System.out.println("Wrong Word!");
                break;
        }
        System.out.println(state);
    }