java.io.StreamTokenizer.whitespaceChars(int low, int hi) 方法规定的字符c在范围 low <= c <= high 的空白字符的所有字符角空格字符只会在输入流分隔标记。在指定范围内的字符的任何其他的属性设置将被清除。

声明

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

public void whitespaceChars(int low, int hi)

参数

• low -- 该范围的低阶。

• high -- 范围的高阶.

返回值

此方法不返回任何值。

异常

• NA

例子

下面的例子显示java.io.StreamTokenizer.whitespaceChars()方法的用法。

package com.yiibai;

import java.io.*;

public class StreamTokenizerDemo {

   public static void main(String[] args) {

      String text = "Hello. This is a text 
 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 letters o- t as white space chars
         st.whitespaceChars('o', 't');

         // 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();
      }
   }
}

让我们编译和运行上面的程序，这将产生以下结果：

Word: Hell
Number: 0.0
Word: Thi
Word: i
Word: a
Word: ex
Word: ha
Word: will
Word: be
Word: li
Word: in
Word: ken
Number: 0.0
Number: 1.0
+ encountered.
Number: 1.0
= encountered.
Number: 2.0
End of File encountered.