(a) The StringBuilder class does not define a trim() method in Java

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(c) The variable middle is assigned the value 6 The variable nt is assigned the string "nt" The substring "nt" occurs three times in the string "Contentment!", starting at indices 2, 5, and 9 The call slastIndexOf(nt, middle) returns the start index of the last occurrence of "nt", searching backwards from position 6
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(b) The reference value in the reference str1 never changes and it refers to the string literal "lower" all the time The calls to toUpperCase() and replace() return a new String object whose reference value is ignored
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(d) The call to the putO() method does not change the String object referred to by the s1 reference in the main() method The reference value returned by the call to the concat() method is ignored
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(b) The code will fail to compile since the expression (s == sb) is illegal It compares references of two classes that are not related
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(e) The program will compile without errors and will print have a when run The contents of the string buffer are truncated down to 6 characters
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(a), (b), and (d) The StringBuilder class does not have a constructor that takes an array of char as a parameter
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(a) The StringBuilder class does not define a trim() method
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(d) The program will construct an immutable String object containing "eeny" and a StringBuilder object containing " miny" The concat() method returns a reference value to a new immutable String object containing "eeny meeny", but the reference value is not stored The append() method appends the string " mo" to the string buffer
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(b) The references sb1 and sb2 are not aliases The StringBuilder class does not override the equals() method, hence the answer is (b)
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APPENDIX D
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(a) The StringBuilder class does not override the hashCode() method, but the String class does The references s1 and s2 refer to a String object and a StringBuilder object, respectively The hash values of these objects are computed by the hashCode() method in the String and the Object class, respectively giving different results The references s1 and s3 refer to two different String objects that are equal, hence they have the same hash value
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(c) The classes String and StringBuilder are unrelated, therefore the first call to the compareTo() method will not compile The class StringBuilder does not implement the Comparable interface, therefore the second call to the compareTo() method will not compile
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(b) The call to the putO() method changes the StringBuilder object referred to by the s1 reference in the main() method So does the call to the append() method
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(a) The type of the return value from the chain of calls is StringBuilder, StringBuilder, String, and int, respectively The string builder contents are changed to "WOW!" by the two first calls in the chain The toString() call extracts the character sequence, which is compared with the string literal "WOW" The compareTo() method returns the value 0 The boolean expression evaluates to false
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111 (a), (b), (c), and (e) A string cannot act as the source of an input stream and as the destination of an output stream provided in the javaio package 112 (b) and (e) The separator constant is of type String and contains the sequence of characters used as path separators on a given platform The most common platforms only use a single character as a path separator, but there is no such restriction 113 (b) The method getName() can be used on a File object to return the name of the entry excluding the specification of the directory in which the entry resides
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(e) The length() method can be used on a File object to return the number of bytes in the file Note that bytes are not the same as characters, and the size of characters in a file depends on the encoding scheme used
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(b) and (d) Compiling and running the program results in the following output:
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/documents//book//chapter1 /wrk//documents//book//chapter1 /wrk/chapter1 chapter1 /documents//book/
(c) The toString() method in the File class produces the same output as the getPath() method Compiling and running the program results in the following output: