Difference object instantiation inside constructor and outside constructor?

[Satish12321]

Is there any difference between the following two object instantiation?

Case 1: Instantiation inside constructor

Class Engine
{
}

Class Car
{
public Engine engine;

public Car()
{
engine = new Engine();
}
}

Case 2: Instantiation outside constructor

Class Engine
{
}

Class Car
{
public Engine engine = new Engine();

public Car()
{
//other lines
}
}

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