Java.io.StreamTokenizer.ordinaryChars() 方法

描述

java.io.StreamTokenizer.ordinaryChars(int low, int hi) 方法指定 low <= c <= high 范围内的所有字符 c 在此标记器中都是"普通"字符。 有关普通字符的更多信息，请参见 normalChar 方法。

声明

以下是 java.io.StreamTokenizer.ordinaryChars() 方法的声明。

public void ordinaryChars(int low, int high)

参数

• low − 范围的低端。

• high − 范围的高端。

返回值

此方法不返回值。

异常

NA

示例

下面的例子展示了 java.io.StreamTokenizer.ordinaryChars() 方法的使用。

package com.tutorialspoint;

import java.io.*;

public class StreamTokenizerDemo {
   public static void main(String[] args) {
      String text = "Hello. This is a text \n that will be split "
         + "into tokens. 1 + 1 = 2";
         
      try {
         // create a new file with an ObjectOutputStream
         FileOutputStream out = new FileOutputStream("test.txt");
         ObjectOutputStream oout = new ObjectOutputStream(out);

         // write something in the file
         oout.writeUTF(text);
         oout.flush();

         // create an ObjectInputStream for the file we created before
         ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt"));

         // create a new tokenizer
         Reader r = new BufferedReader(new InputStreamReader(ois));
         StreamTokenizer st = new StreamTokenizer(r);

         // set chars a to e as ordinary
         st.ordinaryChars('a', 'e');

         // print the stream tokens
         boolean eof = false;
         
         do {
            int token = st.nextToken();
            
            switch (token) {
               case StreamTokenizer.TT_EOF:
                  System.out.println("End of File encountered.");
                  eof = true;
                  break;
                  
               case StreamTokenizer.TT_EOL:
                  System.out.println("End of Line encountered.");
                  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 + " encountered.");
                  
                  if (token == '!') {
                     eof = true;
                  }
            }
         } while (!eof);

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

让我们编译并运行上面的程序，这将产生下面的结果 −

Word: AH
e encountered.
Word: llo.
Word: This
Word: is
a encountered.
Word: t
e encountered.
Word: xt
Word: th
a encountered.
Word: t
Word: will
b encountered.
e encountered.
Word: split
Word: into
Word: tok
e encountered.
Word: ns.
Number: 1.0
+ encountered.
Number: 1.0
= encountered.
Number: 2.0
End of File encountered.