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Autoboxing/Unboxing in J2SE 1.5

Autoboxing/Unboxing in J2SE 1.5

Before J2SE 1.5, Java had primtive data types with wrappers around them, so programmers had to convert from one type to another manually:

public void manualConversion() {int a = 12;Integer b = Integer.valueOf(a);int c = b.intValue();}// --------------------------

Thankfully, J2SE 1.5 comes with a feature called Autoboxing and Unboxing. This eliminates the pain of manual conversion between primitives and wrappers. Behind the scenes, the compiler creates code to implicitly create objects for you:

public void autoBoxing() {int a = 12;Integer b = a;int c = b;}// -------------------------

Remember: Boxing and unboxing too many values can make your garbage collector go mad.

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