104: THE String CLASS in Java

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104: THE String CLASS
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The concat() method does not modify the String object on which it is invoked, as String objects are immutable Instead the concat() method returns a reference to a brand new String object:
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String billboard = "Just"; billboardconcat(" lost in space"); // (1) Returned reference value not stored Systemoutprintln(billboard); // (2) "Just" billboard = billboardconcat(" advertise")concat(" here"); // (3) Chaining Systemoutprintln(billboard); // (4) "Just advertise here"
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At (1), the reference value of the String object returned by the method concat() is not stored This String object becomes inaccessible after (1) We see that the reference billboard still denotes the string literal "Just" at (2) At (3), two method calls to the concat() method are chained The first call returns a reference value to a new String object whose content is "Just advertise" The second method call is invoked on this String object using the reference value that was returned in the first method call The second call results in yet another String object whose content is "Just advertise here" The reference value of this String object is assigned to the reference billboard Because String objects are immutable, the creation of the temporary String object with the content "Just advertise" is inevitable at (3) The compiler uses a string builder to avoid this overhead of temporary String objects when applying the string concatenation operator (p 460) A simple way to convert any primitive value to its string representation is by concatenating it with the empty string (""), using the string concatenation operator (+) (see also (6c) in Figure 102):
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String strRepresentation = "" + 2008; // String conversion: "2008" <---- 2008
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Application of the concatenation operator may result in string conversion being performed on one of the operands, as shown above The string concatenation operator (+) is discussed in Section 57, p 185 Some more examples of string concatenation follow:
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String motto = new String("Program once"); motto += ", execute everywhere"; motto = mottoconcat(" Don't bet on it!"); // (1) // (2) // (3)
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Note that a new String object is assigned to the reference motto each time in the assignment at (1), (2), and (3) The String object with the contents "Program once" becomes inaccessible after the assignment at (2) The String object with the contents "Program once, execute everywhere" becomes inaccessible after (3) The reference motto denotes the String object with the following contents after execution of the assignment at (3):
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"Program once, execute everywhere Don't bet on it!"
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CHAPTER 10: FUNDAMENTAL CLASSES
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Searching for Characters and Substrings
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The following overloaded methods can be used to find the index of a character or the start index of a substring in a string These methods search forward toward the end of the string In other words, the index of the first occurrence of the character or substring is found If the search is unsuccessful, the value 1 is returned
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int indexOf(int ch) int indexOf(int ch, int fromIndex)
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The first method finds the index of the first occurrence of the argument character in a string The second method finds the index of the first occurrence of the argument character in a string, starting at the index specified in the second argument If the index argument is negative, the index is assumed to be 0 If the index argument is greater than the length of the string, it is effectively considered to be equal to the length of the string; resulting in the value -1 being returned
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int indexOf(String str) int indexOf(String str, int fromIndex)
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The first method finds the start index of the first occurrence of the substring argument in a string The second method finds the start index of the first occurrence of the substring argument in a string, starting at the index specified in the second argument The String class also defines a set of methods that search for a character or a substring, but the search is backwards toward the start of the string In other words, the index of the last occurrence of the character or substring is found
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int int int int lastIndexOf(int ch) lastIndexOf(int ch, int fromIndex) lastIndexOf(String str) lastIndexOf(String str, int fromIndex)
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The following methods can be used to create a string in which all occurrences of a character or a subsequence in a string have been replaced with another character or subsequence:
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String replace(char oldChar, char newChar) String replace(CharSequence target, CharSequence replacement)
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The first method returns a new String object that is a result of replacing all occurrences of the oldChar in the current string with the newChar The current string is returned if no occurrences of the oldChar can be found The second method returns a new String object that is a result of replacing all occurrences of the character sequence target in the current string with the character sequence replacement The current string is returned if no occurrences of the target can be found
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boolean contains(CharSequence cs)
This method returns true if the current string contains the specified character sequence, otherwise false