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result = result + sub; result = result + orgsubstring(i + searchlength()); org = result; } } while(i != -1); } }
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The output from this program is shown here: This is a test This is, too Thwas is a test This is, too Thwas was a test This is, too Thwas was a test Thwas is, too Thwas was a test Thwas was, too
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concat( )
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You can concatenate two strings using concat( ), shown here: String concat(String str) This method creates a new object that contains the invoking string with the contents of str appended to the end concat( ) performs the same function as + For example,
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String s1 = "one"; String s2 = s1concat("two");
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puts the string onetwo into s2 It generates the same result as the following sequence:
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String s1 = "one"; String s2 = s1 + "two";
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replace( )
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The replace( ) method has two forms The first replaces all occurrences of one character in the invoking string with another character It has the following general form: String replace(char original, char replacement) Here, original specifies the character to be replaced by the character specified by replacement The resulting string is returned For example,
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String s = "Hello"replace('l', 'w');
puts the string Hewwo into s The second form of replace( ) replaces one character sequence with another It has this general form: String replace(CharSequence original, CharSequence replacement) This form was added by J2SE 5
Part II:
The Java Library
trim( )
The trim( ) method returns a copy of the invoking string from which any leading and trailing whitespace has been removed It has this general form: String trim( ) Here is an example:
String s = " Hello World "trim();
This puts the string Hello World into s The trim( ) method is quite useful when you process user commands For example, the following program prompts the user for the name of a state and then displays that state s capital It uses trim( ) to remove any leading or trailing whitespace that may have inadvertently been entered by the user
// Using trim() to process commands import javaio*; class UseTrim { public static void main(String args[]) throws IOException { // create a BufferedReader using Systemin BufferedReader br = new BufferedReader(new InputStreamReader(Systemin)); String str; Systemoutprintln("Enter 'stop' to quit"); Systemoutprintln("Enter State: "); do { str = brreadLine(); str = strtrim(); // remove whitespace if(strequals("Illinois")) Systemoutprintln("Capital is Springfield"); else if(strequals("Missouri")) Systemoutprintln("Capital is Jefferson City"); else if(strequals("California")) Systemoutprintln("Capital is Sacramento"); else if(strequals("Washington")) Systemoutprintln("Capital is Olympia"); // } while(!strequals("stop")); } }
Data Conversion Using valueOf( )
The valueOf( ) method converts data from its internal format into a human-readable form It is a static method that is overloaded within String for all of Java s built-in types so that each
15:
String Handling
type can be converted properly into a string valueOf( ) is also overloaded for type Object, so an object of any class type you create can also be used as an argument (Recall that Object is a superclass for all classes) Here are a few of its forms: static String valueOf(double num) static String valueOf(long num) static String valueOf(Object ob) static String valueOf(char chars[ ]) As we discussed earlier, valueOf( ) is called when a string representation of some other type of data is needed for example, during concatenation operations You can call this method directly with any data type and get a reasonable String representation All of the simple types are converted to their common String representation Any object that you pass to valueOf( ) will return the result of a call to the object s toString( ) method In fact, you could just call toString( ) directly and get the same result For most arrays, valueOf( ) returns a rather cryptic string, which indicates that it is an array of some type For arrays of char, however, a String object is created that contains the characters in the char array There is a special version of valueOf( ) that allows you to specify a subset of a char array It has this general form: static String valueOf(char chars[ ], int startIndex, int numChars) Here, chars is the array that holds the characters, startIndex is the index into the array of characters at which the desired substring begins, and numChars specifies the length of the substring
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