JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to match a format in string using regular expression?


Description:

Below example shows how to match a string pattern with a regular expression. String.matches() method helps to match the string with a regex. Below example checkes weather given string starts with "www" or not.


Code:
package com.myjava.string;

public class MyStrMatches {

    public static void main(String a[]){
    
        String[] str = {"www.java2novice.com", "http://java2novice.com"};
        for(int i=0;i < str.length;i++){
            if(str[i].matches("^www\\.(.+)")){
                System.out.println(str[i]+" Starts with 'www'");
            } else {
                System.out.println(str[i]+" is not starts with 'www'");
            }
        }
    }
}

Example Output

www.java2novice.com Starts with 'www'
http://java2novice.com is not starts with 'www'

Other String Function Examples

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Everything in java is an object, except primitives. Primitives are int, short, long, boolean, etc. Since they are not objects, they cannot return as objects, and collection of objects. To support this, java provides wrapper classes to move primitives to objects. Some of the wrapper classes are Integer, Long, Boolean, etc.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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