computer programming 2 lecture 5: string processing part b: class stringtokenizer prepared &...
TRANSCRIPT
Computer Programming 2
Lecture 5:String Processing
Part b: Class StringTokenizer
Prepared & Presented by: Mahmoud Rafeek
Alfarra
MINISTRY OF EDUCATION & HIGHER EDUCATIONCOLLEGE OF SCIENCE AND TECHNOLOGY (CST)KHANYOUNIS- PALESTINE
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شريحـة ثابتـة لعلنا نحسن من خاللها أخالقنـا و أفعالنا لنفوز يوم االمتحان الحقيقي
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Class StringTokenizer Introduction Constructors Count Tokens Print Tokens Token Processing
Class StringTokenizer: IntroductionClass StringTokenizer: Introduction
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When you read a sentence, your mind breaks
the sentence into tokens individual words and
punctuation marks, each of which conveys
meaning to you.
Tokens are separated from one another by
delimiters, typically whitespace characters
such as space, tab, newline and carriage return
Class StringTokenizer: ConstructorsClass StringTokenizer: Constructors
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• StringTokenizer(String str)
String x = “Mahmoud Rafeek Alfarra”
StringTokenizer tokens = new StringTokenizer(
x );
String x = “Mahmoud Rafeek Alfarra”
StringTokenizer tokens = new StringTokenizer(
x );
Class StringTokenizer: ConstructorsClass StringTokenizer: Constructors
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• StringTokenizer(String str, String delim)
String x = "2005/12/15“
StringTokenizer tokens = new StringTokenizer(x
, "/");
String x = "2005/12/15“
StringTokenizer tokens = new StringTokenizer(x
, "/");
Class StringTokenizer: ConstructorsClass StringTokenizer: Constructors
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• StringTokenizer(String str, String delim, boolean returnDelims)
str The input
String delimiters
returnDelimiters Returns delimiters as tokens or skip them
String x = "2005/12/15“
StringTokenizer tokens = new StringTokenizer(x ,
"/“, false);
String x = "2005/12/15“
StringTokenizer tokens = new StringTokenizer(x ,
"/“, false);
Class StringTokenizer: CountTokenClass StringTokenizer: CountToken
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• StringTokenizer has a countTokens() method
which Calculates the reminder number of tokens in
the string.String x = "2005/12/15“
StringTokenizer tokens = new StringTokenizer(x ,
"/");
int a = tokens.countToken(); // return 3
String x = "2005/12/15“
StringTokenizer tokens = new StringTokenizer(x ,
"/");
int a = tokens.countToken(); // return 3
Class StringTokenizer: PrintTokensClass StringTokenizer: PrintTokens
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• StringTokenizer has a hasMoreElements() and
hasMoreTokens() methods which Test if there are
more tokens available from this tokenizer's string.
• StringTokenizer has a nextElement() and
nextToken() methods which returns the next token
from this string tokenizer.
Class StringTokenizer: PrintTokensClass StringTokenizer: PrintTokens
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String x = "I love islam So Much“;
StringTokenizer st= new StringTokenizer(x);
while (st.hasMoreElements()) {
System.out.println("token = " + st.nextToken());
Class StringTokenizer: Token ProcessingClass StringTokenizer: Token Processing
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Using the methods of StringClass as
toUpperCase
toLowercase
comparTo
…
we can process the tokens and store it in
data structures
ExampleExample
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import java.util.*;
public class tokenPRoject {
public static void main(String[] args) {
String x = "i love islam so much";
StringTokenizer a = new StringTokenizer (x);
while (a.hasMoreElements()){
String f = a.nextToken();
System.out.println(f.toUpperCase());
System.out.println(a.countTokens()); }
System.out.println("==================");
String [] result = x.split("\\s");
for(int i = 0; i<result.length; i++ )
System.out.println(result[i].toUpperCase( )); } }
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Class
StringBuffer