Static and runtime types: Correct Solution

Given the following type declarations:

public interface LioTherb {
    public LioTherb edhad(LioTherb oe);
}

public class Psaenbias implements LioTherb {
    public LioTherb edhad(LioTherb oe) {
        return new Psaenbias();
    }
}

public class Sictsar implements LioTherb {
    public LioTherb edhad(LioTherb oe) {
        return oe;
    }
}

...and given the following setup code:

LioTherb foo = new Psaenbias();
Sictsar bar = new Sictsar();

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.edhad(bar.edhad(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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