5

[I@16c85db

1, 2



Note: The second line could be different in your case as it is just a memory reference

Code Understanding

class RefDataType
{
int rd=5;
This is declared outside main as it would be referred using the class object.

public static void main(String[] args)
{
RefDataType robj = new RefDataType();
Here robj is simply a reference to the memory area reserved for class based references.

System.out.println(robj.rd);
The reference data type has been used to reference to primitive data in the reference object.

int ar[]={1,2};
Here the array name ar is also a reference to memory location.

System.out.println(ar);
Here the memory location reference is referred so you may get some output which is different in each case as a different location would be referred to.

System.out.println(ar[0]+”, “+ar[1]);
Here the actual value at the given location pointed by 0th and 1st location in the memory reference are being printed.

}
}

Notes

• The oracle documentation for reference type and other types can be seen at.
  https://docs.oracle.com/javase/specs/jls/se7/html/jls-4.html

Suggested Filename(s): RefDataType.java