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Changing the Case of Characters Within a String
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The method toLowerCase( ) converts all the characters in a string from uppercase to lowercase The toUpperCase( ) method converts all the characters in a string from lowercase to uppercase Nonalphabetical characters, such as digits, are unaffected Here are the general forms of these methods: String toLowerCase( ) String toUpperCase( ) Both methods return a String object that contains the uppercase or lowercase equivalent of the invoking String Here is an example that uses toLowerCase( ) and toUpperCase( ):
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// Demonstrate toUpperCase() and toLowerCase() class ChangeCase { public static void main(String args[]) { String s = "This is a test"; Systemoutprintln("Original: " + s);
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String upper = stoUpperCase(); String lower = stoLowerCase(); Systemoutprintln("Uppercase: " + upper); Systemoutprintln("Lowercase: " + lower); } }
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The output produced by the program is shown here: Original: This is a test Uppercase: THIS IS A TEST Lowercase: this is a test
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Additional String Methods
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In addition to those methods discussed earlier, String includes several other methods These are summarized in the following table Notice that many were added by J2SE 5
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Method int codePointAt(int i) int codePointBefore(int i) int codePointCount(int start, int end) boolean contains(CharSequence str) boolean contentEquals(CharSequence str) boolean contentEquals(StringBuffer str) static String format(String fmtstr, Object args) static String format(Locale loc, String fmtstr, Object args) boolean matches(string regExp) int offsetByCodePoints(int start, int num) String replaceFirst(String regExp, String newStr) String replaceAll(String regExp, String newStr) Description Returns the Unicode code point at the location specified by i Added by J2SE 5 Returns the Unicode code point at the location that precedes that specified by i Added by J2SE 5 Returns the number of code points in the portion of the invoking String that are between start and end 1 Added by J2SE 5 Returns true if the invoking object contains the string specified by str Returns false, otherwise Added by J2SE 5 Returns true if the invoking string contains the same string as str Otherwise, returns false Added by J2SE 5 Returns true if the invoking string contains the same string as str Otherwise, returns false Returns a string formatted as specified by fmtstr (See 18 for details on formatting) Added by J2SE 5 Returns a string formatted as specified by fmtstr Formatting is governed by the locale specified by loc (See 18 for details on formatting) Added by J2SE 5 Returns true if the invoking string matches the regular expression passed in regExp Otherwise, returns false Returns the index with the invoking string that is num code points beyond the starting index specified by start Added by J2SE 5 Returns a string in which the first substring that matches the regular expression specified by regExp is replaced by newStr Returns a string in which all substrings that match the regular expression specified by regExp are replaced by newStr
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15:
String Handling
Method String[ ] split(String regExp)
Description Decomposes the invoking string into parts and returns an array that contains the result Each part is delimited by the regular expression passed in regExp Decomposes the invoking string into parts and returns an array that contains the result Each part is delimited by the regular expression passed in regExp The number of pieces is specified by max If max is negative, then the invoking string is fully decomposed Otherwise, if max contains a nonzero value, the last entry in the returned array contains the remainder of the invoking string If max is zero, the invoking string is fully decomposed Returns a substring of the invoking string, beginning at startIndex and stopping at stopIndex This method is required by the CharSequence interface, which is now implemented by String
String[ ] split(String regExp, int max)
CharSequence subSequence(int startIndex, int stopIndex)
Notice that several of these methods work with regular expressions Regular expressions are described in 27
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