Automatic Disassembly/Boxing

Auto-Boxing: If an int constant is passed to the place where an integer object is required, then the compiler will insert a call to the integer construction method behind the scenes, which is called auto-boxing

1 Integer i = n;

Auto-unpacking: If an integer object is placed where the int type is required, the compiler will insert a call to the Intvalue method behind the scenes, which is called auto-unpacking.

Similar scenarios can occur for other 7 pairs of base type/wrapper types.

1 New Integer (2); 2 int x = i;

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Automatic Disassembly/Boxing