ordinaryChars()
方法normalChars()方法在java.io包中可用。
normalChars()方法用于标识所有字符都位于给定范围内(st [start],en [end])在此StreamTokenizer中是“普通”字符。
normalChars()方法是一种非静态方法,仅可通过类对象访问,如果尝试使用类名访问该方法,则会收到错误消息。
normalChars()方法在识别普通字符时不会引发异常。
语法:
public void ordinaryChars(int st, int en);
参数:
int st –表示识别字符的第一个端点。
int en –表示识别字符的最后一个端点。
返回值:
该方法的返回类型为void,不返回任何内容。
示例
// Java程序演示示例 // of void ordinaryChars(int st, int en) method of // StreamTokenizer- import java.io.*; public class OrdinaryChars { public static void main(String[] args) { String str = "Hi, This is \n a mathematical expression :\t " + " 2 * 4 = 8 \t" + "8 + 5 = 13"; try { //实例化FileOutputStream和ObjectOutputStream- FileOutputStream fos_stm = new FileOutputStream("D:\\includehelp.txt"); ObjectOutputStream obj_out_stm = new ObjectOutputStream(fos_stm); //通过使用writeUTF()方法是 //将给定的字符串写入文件 obj_out_stm.writeUTF(str); obj_out_stm.flush(); //实例化FileOutputStream和ObjectOutputStream- ObjectInputStream obj_in_stm = new ObjectInputStream(new FileInputStream("D:\\includehelp.txt")); //实例化StreamTokenizer和Reader- Reader reader = new BufferedReader(new InputStreamReader(obj_in_stm)); StreamTokenizer st = new StreamTokenizer(reader); //通过使用ordinaryChars()方法是 //将所有字符设置为普通字符所在 //在['s','a'] st.ordinaryChars('s', 'a'); //在这里,我们开始考虑 //文件不为空 boolean end_of_file = false; while (!end_of_file) { //通过使用nextToken()方法是 //解析流中的下一个标记 int token = st.nextToken(); switch (token) { case StreamTokenizer.TT_EOF: System.out.println("End of File Found"); end_of_file = true; break; case StreamTokenizer.TT_EOL: System.out.println("End of Line Found"); break; case StreamTokenizer.TT_WORD: System.out.println("word: " + st.sval); break; case StreamTokenizer.TT_NUMBER: System.out.println("number: " + st.nval); break; default: System.out.println((char) token + " Found."); } } } catch (Exception ex) { ex.printStackTrace(); } } }
输出结果
word: AHi , Found. word: This word: is word: a word: mathematical word: expression : Found. number: 2.0 * Found. number: 4.0 = Found. number: 8.0 number: 8.0 + Found. number: 5.0 = Found. number: 13.0 End of File Found