Strange behavior with java overloading

Question

i've some problems with java overloading and dynamic parameters..

import java.lang.*;

public class Program
{
     public static void main(String []args){
        testOverloading("Test string");
        testOverloading(new Object());
        testOverloading( true ? "Must be a string" : new Object());
     }

     public static void testOverloading(String test) {
         System.out.println("it's a string");
     }

     public static void testOverloading(Object test) {
         System.out.println("it's an object");
     }

}

running this code the java assume that "true ? "Must be a string" : new Object()" is an object and not a string..and the output is the follow:

it's a string
it's an object
it's an object

is there a solution/explaination for this kind of issue?

Update:

i tried also using a different approach:

changing:

testOverloading( true ? "Must be a string" : new Object());

in

testOverloading( true ? "Must be a string" : new Program());

and

public static void testOverloading(Object test) {

in

public static void testOverloading(Program test) {

and the output is:

error: no suitable method found for testPoly(Object)

so i've to assume that it's a compiler limitation with parameters that use single-line condition

in fact using normal the output is right:

    if (true)
        testOverloading("Must be a string");
    else
        testOverloading(new Object());

output: it's a string

Answer 1

true ? "Must be a string" : new Object() should have a single type of return. In this case, the compiler will choose the highest class in the class hierarchy for the elements being returned, which is Object.