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■■ To revise the lottery program using strings (LotteryUsingStrings) (§4.5.3). ■■ To convert a hexadecimal character to a decimal value (HexDigit2Dec) (§4.5.2). ■■ To program using characters and strings (GuessBirthday) (§4.5.1). ■■ To find a character or a substring in a string using the indexOf method (§4.4.9). ■■ To compare strings using the equals and the compareTo methods (§4.4.7). ■■ To read a character from the console (§4.4.6). ■■ To read strings from the console (§4.4.5). ■■ To return an uppercase string or a lowercase string and to trim a string (§4.4.4). ■■ To use the + operator to concatenate strings (§4.4.3). ■■ To return a character in the string using the charAt(i) method (§4.4.2). ■■ To return the string length using the length() method (§4.4.1). ■■ To represent strings using the String object (§4.4). ■■ To introduce objects and instance methods (§4.4). ■■ To compare and test characters using the static methods in the Character class (§4.3.4).
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■■ To cast a numeric value to a character and cast a character to an integer (§4.3.3). ■■ To represent special characters using the escape sequences (§4.3.2). ■■ To encode characters using ASCII and Unicode (§4.3.1). ■■ To represent characters using the char type (§4.3). Chapter Mathematical 4 Functions, Characters, and Strings Objectives ■■ To solve mathematical problems by using the methods in the Math class (§4.2).