Data Type Java Tutorial

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;
  }
}