Why the two objects are not add by java

Question

like below
Integer i1=new Integer(5);
Integer i2=new Integer(5);
System.out.println(i1+i2);
if i run this program out put is 10
but
Object o1=new Object();
Object o2=new Object();
System.out.println(o1+o2);
gives compilation error.
plz help me to solve this doubt

Answer 1

Assuming this is not an April Fools Day joke,
then the serious answer is: what does it MEAN to add two arbitrary objects?
Intuitive answer:
If all you told Java is that o1 is an Object and o2 is an Object,
how would Java know what to do with them?
Are them numbers? Are they lists? Are they graphical icons? What?
Technical answer:
The + operator requires numbers or Strings.
And Java's auto-unboxing only works for primitive types.
So only String, Float, Double, Integer, Short... will work.
Object will not work.