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| A1: | Object Wrappers are serializable classes and thus can be safely passed between classes possibly running inside different processes. |
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| A2: | Use the Integer.parseInt( String s ) method. |
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| A3: | Immutability means that an object's value cannot be changed; in order to change the value of an immutable class, a new instance of the class must be created with the new value and the old value is orphaned in memory. |
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| A4: | Because strings are immutable, Java has created the notion of a string table that represents all strings running in an application; this is an optimization so that only one instance of a string is represented in memory even if multiple variables are referencing it. |
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| A5: | Java has created the notion of a string table that represents all strings running in an application; this is an optimization so that only one instance of a string is represented in memory even if multiple variables are referencing it. |
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| A6: | The String class is immutable while the StringBuffer class is not; the StringBuffer class is free to change its value without having to orphan its old value in memory and create a new instance in memory as the String class does. |
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| A7: | The StringBuffer class provides a reverse() method that reverses the contents of a string. |
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| A8: | The StringTokenizer class is a utility class that takes a String and returns tokens, with delimiters defined by the caller, back to the caller. |
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| A9: | A delimiter defines the characters that separate tokens. |
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| A10: | Some of its uses include parsing text based documents into words or parsing comma-separated value (CSV) files into their comma-separated values. |
