Look at the following classes: 

Public class Ground
{
 Public Ground()
 {
 System.out.println("You are on the ground.");
 }
 Public Ground(String groundColor)
 {
 System.out.println("The ground is " +
 GroundColor);
 }
}
Public class Sky extends Ground
{
 Public Sky()
 {
 System.out.println("You are in the sky.");
 }
 Public Sky(String skyColor)
 {
 Super("green");
 System.out.println("The sky is " + skyColor);
 }
}

What will the following program display? 

Public class Checkpoint
{
 Public static void main(String[] args)
 {
 Sky object = new Sky("blue");
 }
}