java - Object, reference and class. Need help understanding some code -

i kind of understand that:

• a class kind of blueprint objects can created from.
• a object actual instance or object gets created.
• a reference address points said object.

what happens when below code called twice?

car batmobile = new car(); 

will 2 objects created? if so, happens first object? in detail, happens in terms of class, object , reference?

part 2:

is infinite loop? objects keep getting created since constructor makes object , calls on constructor again? how class, object, reference relation work here?

public class alphabet {   alphabet abc;    public alphabet() {     abc = new alphabet();   } } 

car batmobile = new car(); 2 objects created?

if it's called twice yes. because line creates new instance of object. doing twice result in 2 new instances. note, however, if try execute same exact line twice in row compiler error because you'd trying re-declare same variable in same scope.

but otherwise, no, there's 1 object being created on line. car mentioned twice because declares type variable (batmobile) , constructor (car()). languages (c#, javascript, untyped languages, etc. not java) have shorthand first use, since it's inferred second. example:

var batmobile = new car(); 

is infinite loop?

nope, there's no loop here:

public class alphabet{     alphabet abc;      public alphabet(){         abc = new alphabet();     } } 

there is, however, stack waiting overflown. in order create alphabet 1 must first create alphabet. run code , see error. infinite loop execute infinitely (assuming each iteration of loop didn't compound use of finite resource), example:

while (true) {     car batmobile = new car(); } 

this execute without end. code posted, however, end. error. because each call constructor internally calls constructor. call stack finite resource, exhausted.