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Easy Learn Java: Programming Articles, Examples and Tips - Page 370


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String Regex Methods

Go to all tips in Text processing

In addition the the Pattern and Matcher classes, there is some support for regular expressions in the String class.

    boolean b;
    String s, s2, t;
    String  regex;
    String[]  sa;
    
b = s.matches(regex) True if regex matches the entire string in s. Same as Pattern.matches(regex, s)
s2 = s.replaceAll(regex, t) Returns a new string by replacing each substring in s that matches regex with t
s2 = s.replaceFirst(regex, t) Replaces first substring in s that is matched by regex with String t
sa = s.split(regex) Breaks s into substrings separated by regex or terminated by the end. There is a problem with this though. If the string is terminated by the separation regex, it will return one extra empty string. If you're separating elements with whitespace ("s+"), you can call trim() on the subject first. See the example below.
sa = s.split(regex, count) Splits the string, but limits applying regex to only count times.

Example - breaking strings into parts

Input lines often contain many values. An easy way to split a string into separate parts is to use the String split() method. This example splits the line into tokes that are separated by one or more blanks.

// Example of splitting lines from input file with regular expression.
while ((line = input.readLine()) != null) {
    String[] tokens = line.trim().split("s+"); // Separated by "whitespace"
    int sum = 0;
    for (String t : tokens) {
        try {
            sum += Integer.parseInt(t);
        } catch (NumberFormatException ex) {
            System.out.println("Not an integer: " + t);
            System.out.println(ex);
        }
    }
    System.out.println("sum = " + sum);
}


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Posted by jalex on Monday, June 06, 2005 (00:00:00) (3355 reads)

Gosling onto real time Java

Go to all tips in Good To Know Celebrating its tenth year, its founder is now working on bringing out technology innovations with Real Time Java. Thursday, May 19, 2005

BANGALORE: Java is into its tenth year and is still a hot brew! From mobile applications and gaming to being deployed on the Mars Rover, the proof of its appeal even now is endorsed by the 2500 strong developer crowd that turned up at the key-note of Sun Tech Days in Bangalore.

Debuted in May 1995, it was initially used to create moving images on static HTML pages. The programming language which had the slogan 'Write once, run anywhere' as its credo, literally has gone places. The first edition JDK was launched in 1996.

"The founder of Java, James Gosling, is now working on bringing out technology innovations with Real Time Java," said Gosling's boss and, Sun's VP, Java Developer and Strategy, Jeff Jackson.

Java at present drives around $100 billion worth of business annually.

CyberMedia News



comments? | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Tuesday, June 07, 2005 (00:00:00) (2431 reads)

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