I have a class :

class Employee{...}

then :

Employee aEmployee = new Employee(...);
int i = 10;
String str = aEmployee + i;

it generates a ERROR when compiled, Why ?

// EDIT ////////////////////////////////////
I didn't override the toString() method in Employee class
but if I try this  :

Employee aEmployee = new Employee(...);
String h = "hello";
String str = aEmployee + h;  

this time will be fine  , both compiling and running
So : why is it OK after change the int variable i to a String variable h ?

I have a class :

class Employee{...}

then :

Employee aEmployee = new Employee(...);
int i = 10;
String str = aEmployee + i;

it generates a ERROR when compiled, Why ?

EDIT: I didn't override the toString() method in the Employee class, but if I try this:

Employee aEmployee = new Employee(...);
String h = "hello";
String str = aEmployee + h;  

this time will be fine, both compiling and running.

So: why is it OK after changing the int variable i to a String variable h?

I have a class :

class Employee{...}

then :

Employee aEmployee = new Employee(...);
int i = 10;
String str = aEmployee + i;

it generates a ERROR when compiled, Why ?

I have a class :

class Employee{...}

then :

Employee aEmployee = new Employee(...);
int i = 10;
String str = aEmployee + i;

it generates a ERROR when compiled, Why ?

// EDIT ////////////////////////////////////
I didn't override the toString() method in Employee class
but if I try this :

Employee aEmployee = new Employee(...);
String h = "hello";
String str = aEmployee + h;  

this time will be fine , both compiling and running
So : why is it OK after change the int variable i to a String variable h ?