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Java Autoboxing and Unboxing

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Java 1.5 introduced a special feature of auto conversion of primitive types to the corresponding Wrapper class and vice versa. Autoboxing : Automatic conversion of primitive types to the object of their corresponding wrapper classes is known as autoboxing. For example – conversion of int to Integer, long to Long, double to Double etc. Unboxing : It is just the reverse process of autoboxing. Automatically converting an object of a wrapper class to its corresponding primitive type is known as unboxing. For example – conversion of Integer to int, Long to long, Double to double etc. Primitive type Wrapper class boolean         Boolean byte             Byte char             Character float            Float int              Integer ...
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Java Regular Expressions (java regex)

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Regular expressions are used for defining String patterns that can be used for searching, manipulating and editing a text. These expressions are also known as Regex (short form of Regular expressions). Lets take an example to understand it better: In the below example, the regular expression .*book.* is used for searching the occurrence of string “book” in the text. import java.util.regex.*;   class RegexExample1{      public static void main(String args[]){         String content = "This is Chaitanya " +             "from Beginnersbook.com.";       String pattern = ".*book.*";       boolean isMatch = Pattern.matches(pattern, content);       System.out.println("The text contains 'book'? " + isMatch);    } }   Output: The text contains 'book'? true In t...
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