Versions

[{“Name”:“Java SE 5”,“GroupName”:null},{“Name”:“Java SE 6”,“GroupName”:null},{“Name”:“Java SE 7”,“GroupName”:null},{“Name”:“Java SE 8”,“GroupName”:null},{“Name”:“Java SE 9 (Early Access)”,“GroupName”:null}]

Introduction

Autoboxing is the automatic conversion that Java compiler makes between primitive types and their corresponding object wrapper classes. Example, converting int -> Integer, double -> Double… If the conversion goes the other way, this is called unboxing. Typically, this is used in Collections that cannot hold other than Objects, where boxing primitive types is needed before setting them in the collection.

Remarks

Autoboxing can have performance issues when used frequently in your code.

• http://docs.oracle.com/javase/1.5.0/docs/guide/language/autoboxing.html
• http://stackoverflow.com/questions/6037389/integer-auto-unboxing-and-auto-boxing-gives-performance-issues