Wrapper Class and Type Casting

Special classes corresponding to data types which provide advanced functionality on data types are called as wrapper classes.
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1.2 AutoBoxing

Java 5 supports automatic conversion of primitive types (int, float, double etc.) to their object equivalents (Integer, Float, Double,...) in assignments, method and constructor invocations. This conversion is know as autoboxing.
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Casts can be implicit (Widening Conversion) or explicit (Narrowing Conversion).
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Here are some example for Autpboxing and Implicit-Explicit casting