问题描述 关于java,有哪位大神能帮忙看这代码分别是什么意思吗? case StreamTokenizer.TT_NUMBER: s = Double.toString(st.nval); break; case StreamTokenizer.TT_WORD: s = st.sval; // Already a String break; default: // single character in ttype s = String.valueOf((char)st.ttype); } i