Autoboxing and Unboxing in Java

Autoboxing in Java

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Automatic conversion of primitive data type to wrapper Class object is known as autoboxing in Java. Example-

Integer i = 10; //Here compiler automatically convert int to Integer

After compilation, the above code will become

Integer i = Integer.valueOf(10);

It means by using valueOf() autoboxing concept is implemented in Java

Automatic conversion of wrapper class object to primitive by compiler is known as unboxing in Java.

Integer i = new Integer(10); 
int i2 = i;  // Compiler converts Integer to int