Answer Posted / devendra

An int is a primitive. It is not an Object.int variables
are mutable. Unless you mark them final, you can change
their value at any time.
An Integer, is a Object that contains a single int
field.Integers are immutable. If you want to affect the
value of a Integer variable, the only way is to create a
new Integer object and discard the old one.

Converting
// to int i from Integer ii
int i = ii.intValue();

// to Integer ii from int i
Integer ii = new Integer( i );

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