With the advent of Java 2.0 (yay!!!), now when a method expects an Object as its parameter can be passed a primitive data type (i.e. int, double, char) and automatically "box" it into its corresponding Wrapper Object (i.e. Integer, Double, Character), thus primitives could be passed as an Object parameter.
It also works the other way, "auto-unboxing" you can directly modify primitives Wrapper Objects with primitive operations(i.e. +, -, /, %)
For example:
Integer myInt = new Integer( 10 ); // creates an Integer holding 100
int yourInt = myInt * 10; // yourInt is now a primative holding 100
myInt = myInt * 10; // myInt also holds 100
Conversion of primitive data types automatically to their corresponding wrapper classes is called AutoBoxing and the reverse of this operation is called UnBoxing. Ex: Long L = new Long(100); long x = L; Now x will have a value 100.
java
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