Regular Expressions in Java - Signal Processing

Regular Expressions in Java



BASIC HANDLING OF STRINGS

The Java language includes a primitive data type char, which holds a 16-bit unicode character. You can hold multiple characters in a String object, or in a StringBuffer object. 

Methods such as equals and equalsIgnoreCase, startsWith and endsWith allow you to test Strings against one another. Methods such as indexOf and substring allow you to perform operations on a String. parseInt and other similarly named methods allow you to extract a number (in this example an int) from a String, although you do need to remember to catch the exception that may be thrown. 

In certain specialist applications, such as Bioinformatics, multiple characters can also be usefully held in a char array, where they're likely to be dealt with character-by-character in a loop, as in DNA and RNA sequencing. 

The StringTokenizer class allows you to take a String and step through it element-by-element (token-by-token) to handle it in chunks or sections. You can choose what character or characters you use between the elements to break up the string in the way you want. 


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Diposkan oleh EKO SUHARTONO On Thursday, April 7, 2011
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