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Characters

Characters. In Java single characters are represented using the data type char . Character constants are written as symbols enclosed in single quotes, for example, 'a' , 'X ', and '5' .

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Characters

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  1. Characters • In Java single characters are represented using the data type char. Character constants are written as symbols enclosed in single quotes, for example, 'a', 'X', and '5'. • To represent characters in computer, U. S. computer manufacturers devised several schemes for encoding characters as integers. • One coding scheme widely used today is ASCII (American Standard Code for Information Interchange).

  2. 9 For example, character 'O' is 79 (row value 70 + col value 9 = 79). O 70 ASCII Table

  3. Declaration and initialization char ch1, ch2 = ‘X’; System.out.println("ASCII of X is " + (int) 'X' ); System.out.println("Char 88 is " + (char)88 ); Type conversion between int and char. Character Translation • Erf … out to reality ASCIITranslate.java

  4. ‘A’ < ‘c’ This comparison returns true because ASCII value of 'A' is 65 while that of 'c' is 99. Character Comparison • Spling … out to reality CharOrder.java

  5. Special Characters • These are also known as “escape characters” • Written using a \ prefix • \t \n \b \g \’ \\ • Spling … out to reality EscapeCharacters.java

  6. The Character Class • The Character class in the java.lang package includes methods for manipulating character values. • Example, use isLetter to check if a character is a-z or A-Z • Zzzznicka … out to reality … CharGames.java • Zzzznicka … out to reality … CharGamesCompressed.java

  7. Unicode • To accommodate the character symbols of non-English languages, the Unicode Consortium established the Unicode Worldwide Character Standard, commonly known as Unicode.

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