Java.io.StreamTokenizer.nextToken()方法實例

java.io.StreamTokenizer.nextToken() 方法分析從標記生成器的輸入流中的下一個標記。下一個標記的類型在ttype字段中返回。關於令牌的附加信息可能是在nval字段或標記生成器的sval 字段。這一類的典型客戶端首次設置語法表，然後坐在一個循環調用nextToken的解析連續的標記，直到TT_EOF返回。

聲明

以下是java.io.StreamTokenizer.nextToken()方法聲明

public int nextToken()

參數

• NA

返回值

此方法返回ttype字段的值。

異常

• IOException -- 如果發生I/O錯誤。

例子

下面的示例演示java.io.StreamTokenizer.nextToken()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); // 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：

Word: Hello. Word: This Word: is Word: a Word: text Word: that Word: will Word: be Word: split Word: into Word: tokens. Number: 1.0 + encountered. Number: 1.0 = encountered. Number: 2.0 End of File encountered.