Static and runtime types: Correct Solution

Given the following type declarations:

public class Inpri {
    public Inpri pris(Inpri glas) {
        return glas;
    }
}

public class Bostdest extends Inpri {
    public Inpri pris(Inpri glas) {
        return this;
    }
}

public class Picboo extends Inpri {
    public Inpri pris(Inpri glas) {
        return new Bostdest();
    }
}

...and given the following setup code:

Picboo foo = new Picboo();
Inpri bar = new Bostdest();

Part 1

Draw an AST for the following expression, labeling the static type (a.k.a. compile-time type) of each node in the tree:

foo.pris(bar.pris(bar))

(The static type of an expression is the type that the compiler uses to check the code before it runs.)

Solution

Part 2

Draw an AST for the same expression, this time labeling the runtime type of each node in the tree.

(The runtime type of an expression is the type of the actual value that appears when the code runs.)

Solution

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