Fundamental Classes in Java

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101 (b) The method hashCode() in the Object class returns a hash code value of type int 102 (e) All arrays are genuine objects and inherit all the methods defined in the Object class, including the clone() method Neither the hashCode() method nor the equals() method is declared final in the Object() class, and it cannot be guaranteed that implementations of these methods will differentiate between all objects (a) The clone() method of the Object class will throw a CloneNotSupportedException if the class of the object does not implement the Cloneable interface (a), (c), and (d) The class javalangVoid is considered a wrapper class, although it does not wrap any value There is no class named javalangInt, but there is a wrapper class named javalangInteger A class named javalangString also exists, but it is not a wrapper class since all strings in Java are objects (c) and (d) The classes Character and Boolean are non-numeric wrapper classes and they do not extend the Number class The classes Byte, Short, Integer, Long, Float, and Double are numeric wrapper classes that extend the Number class
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APPENDIX D
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(a), (b), and (d) All instances of concrete wrapper classes are immutable
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(b) and (c) All instances of wrapper classes except Void and Character have a constructor that accepts a string parameter The class Object has only a default constructor
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(e) While all numeric wrapper classes have the methods byteValue(), doubleValue(), floatValue(), intValue(), longValue(), and shortValue(), only the Boolean class has the booleanValue() method Likewise, only the Character class has the charValue() method
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(b) and (d)
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String is not a wrapper class All wrapper classes except Boolean and Void have a compareTo() method Only the numeric wrapper classes have an intValue() method The Byte class, like all other numeric wrapper classes, extends the Number
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class 1010 (d) Wrapper objects are immutable, but the following values are interned when they are wrapped during boxing, ie, only one wrapper object exists in the program for these primitive values when boxing is applied: boolean values true and false All byte values (-128, 127) short values between -128 and 127 int values between -128 and 127 char in the range \u0000 to \u007f 1011 (a) Using the new operator creates a new object Boxing also creates a new object if one is not already interned from before 1012 (b) and (e) The operators - and & cannot be used in conjunction with a String object The operators + and += perform concatenation on strings, and the dot operator accesses members of the String object 1013 (d) The expression strsubstring(2,5) will extract the substring "kap" The method extracts the characters from index 2 to index 4, inclusive
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APPENDIX D
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(d) The program will print str3str1 when run The concat() method will create and return a new String object, which is the concatenation of the current String object and the String object given as an argument The expression statement str1concat(str2) creates a new String object, but its reference value is not stored
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(c) The trim() method of the String class returns a string where both the leading and the trailing white space of the original string have been removed
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(a) and (c) The String class and all wrapper classes are declared final and, therefore, cannot be extended The clone() method is declared protected in the Object class String objects are immutable and, therefore, cannot be modified The classes String and StringBuilder are unrelated
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(a), (b), (c), and (e) The expressions ('c' + 'o' + 'o' + 'l') and ('o' + 'l') are of type int due to numeric promotion Expression (d) is illegal, since the String class has no constructor taking a single int parameter Expression (a) is legal, since string literals denote String objects and can be used just like any other object
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(d) The constant expressions "ab" + "12" and "ab" + 12 will, at compile time, be evaluated to the string-valued constant "ab12" Both variables s and t are assigned a reference to the same interned String object containing "ab12" The variable u is assigned a new String object, created by using the new operator
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(a), (c), and (d) The String class does not have a constructor that takes a single int as a parameter (e) The String class has no reverse() method (d) The expression "abcdef"charAt(3) evaluates to the character 'd' The charAt() method takes an int value as an argument and returns a char value The expression ("abcdef")charAt(3) is legal It also evaluates to the character 'd' The index of the first character in a string is 0 (e) The expression "Hello there"toLowerCase()equals("hello there") will evaluate to true The equals() method in the String class will only return true if the two strings have the same sequence of characters
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