StreamTokenizer類whitespaceChars()方法 (StreamTokenizer Class whitespaceChars() method)

• whitespaceChars() method is available in java.io package.

  whitespaceChars()方法在java.io包中可用。

• whitespaceChars() method is used to denotes that all the characters lies in the given range(st[start], en[end]) are whitespace characters. Whitespace characters serve only to separate tokens in the input stream.

  whitespaceChars()方法用于表示位于給定范圍內的所有字符(st [start]，en [end])都是空白字符。 空格字符僅用于分隔輸入流中的標記。

• whitespaceChars() method accepts two parameters and both parameters are of “int” type.

  whitespaceChars()方法接受兩個參數，并且兩個參數均為“ int”類型。

• whitespaceChars() method does not throw an exception at the time of representing whitespace characters.

  表示空白字符時， whiteChars()方法不會引發異常。

Syntax:

句法：

public void whitespaceChars(int st, int en);

Parameter(s):

參數：

• int st – represents the starting endpoint of the given range.

  int st –代表給定范圍的起始端點。

• int en – represents the ending endpoint of the given range.

  int en –代表給定范圍的終點。

Return value:

返回值：

The return type of the method is void, it returns nothing.

該方法的返回類型為void ，不返回任何內容。

Example:

例：

// Java program to demonstrate the example // of void whitespaceChars(int st, int en) method // of StreamTokenizerimport java.io.*;public class WhiteSpaceChars {public static void main(String[] args) {String str = "Hi, This is \n a mathematical expression :\n " +" 2 * 4 = 8 " + "8 + 5 = 13";try {// Instantiates FileOutputStream and ObjectOutputStream FileOutputStream fos_stm = new FileOutputStream("D:\\includehelp.txt");ObjectOutputStream obj_out_stm = new ObjectOutputStream(fos_stm);// By using writeUTF() method is to// write the given string in the fileobj_out_stm.writeUTF(str);obj_out_stm.flush();// Instantiates FileOutputStream and ObjectOutputStream ObjectInputStream obj_in_stm = new ObjectInputStream(new FileInputStream("D:\\includehelp.txt"));// Instantiates StreamTokenizer and ReaderReader reader = new BufferedReader(new InputStreamReader(obj_in_stm));StreamTokenizer st = new StreamTokenizer(reader);// By using whitespaceChars() method is to// represent all the chars lies in between // (e,s) are whitespace charsst.whitespaceChars('e', 's');// Here, we are considering initially // file is not emptyboolean end_of_file = false;while (!end_of_file) {// By using nextToken() method is to// parse the next token from the streamint token = st.nextToken();switch (token) {case StreamTokenizer.TT_EOF:System.out.println("End of File Found");end_of_file = true;break;case StreamTokenizer.TT_EOL:System.out.println("End of Line Found");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 + " Found.");}}} catch (Exception ex) {ex.printStackTrace();}} }

Output

輸出量

@ Found. word: H , Found. word: T word: a word: at word: at word: ca word: x : Found. number: 2.0 * Found. number: 4.0 = Found. number: 8.0 number: 8.0 + Found. number: 5.0 = Found. number: 13.0 End of File Found

翻譯自: https://www.includehelp.com/java/streamtokenizer-whitespacechars-method-with-example.aspx

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