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Common Wrapper Conversion Methods.....???

 
Greenhorn
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someone why we use wrapper classes and conversion methods...??? i have attached a file...please explain that table in that file........

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Common Wrapper Conversion Methods
 
Greenhorn
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main purpose of wrapper class and its method are to convert ---
1) primitive values in object => Integer.valueOf(42)
2) object in primitive values => xxxValue()
3) String to wrapper object => Integer.valueOf("42")
4) wrapper object to String => new Integer(42).toString()
5) primitive values in String => Integer.toString(42)
6) String in primitive values => parseXxx()
 
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