Java.io.StreamTokenizer.commentChar()方法實例
java.io.StreamTokenizer.commentChar(int ch) 方法指定的字符參數啓動一個單行註釋。所有字符從註釋字符開始到行末尾由該流標記者忽略。指定字符的任何其他屬性設置將被清除。
聲明
以下是java.io.StreamTokenizer.commentChar()方法的聲明
public void commentChar(int ch)
參數
- ch -- 字符
返回值
此方法不返回任何值。
異常
- NA
例子
下面的示例演示java.io.StreamTokenizer.commentChar()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 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(); } } }
讓我們編譯和運行上面的程序,這將產生以下結果:
< encountered.
Word: Hello.
Word: This
Word: is
End of File encountered.