Boxing refers to the conversion of a primitive to a corresponding wrapper instance, such as from an int to a java.lang.Integer.
Unboxing is the conversion of a wrapper instance to a primitive type, such as from Byte to byte.
public class MainClass{
public static void main(String[] args){
Integer number = new Integer (100);
int [] ints = new int [2];
ints [0] = number;
}
}