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

java.io.StreamTokenizer.eolIsSignificant(boolean flag) 方法確定行尾是否被視爲令牌。如果flag參數爲true，此標記生成器把線作爲標記的結束; nextToken方法返回TT_EOL並且還設置了ttype字段中這個值時，行尾被讀取。 一行是不符合任何一個回車符(' ')或換行符(' ')結尾的字符序列。此外，一個回車符緊跟一個換行符被視爲行尾單令牌。如果標誌爲false，行尾的字符都被視爲空白和它的作用只是單獨的令牌。

聲明

以下是java.io.StreamTokenizer.eolIsSignificant()方法的聲明

public void eolIsSignificant(boolean flag)

參數

• flag --true表示行尾的字符都是分隔標記; false表示行尾的字符是空白。

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.eolIsSignificant()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 that end of line is significant st.eolIsSignificant(true); // 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(); } } }

讓我們來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 End of Line encountered. 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.