Java.io.StreamTokenizer.commentChar() 方法

描述

java.io.StreamTokenizer.commentChar(int ch) 方法指定字元引數作為單行註釋的開始。此流標記器會忽略從註釋字元到行尾的所有字元。為指定字元設定的任何其他屬性都將被清除。

宣告

以下是java.io.StreamTokenizer.commentChar() 方法的宣告。

public void commentChar(int ch)

引數

ch − 字元。

返回值

此方法不返回值。

異常

無

示例

以下示例演示了java.io.StreamTokenizer.commentChar() 方法的用法。

package com.tutorialspoint;

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 character "a" as a commentChar
         st.commentChar('a');

         // 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();
      }
   }
}

讓我們編譯並執行上面的程式，這將產生以下結果：

< encountered.
Word: Hello.
Word: This
Word: is
End of File encountered.