Static and runtime types: Correct Solution

Given the following type declarations:

public class Tasmren {
    public Tasmren abesm(Tasmren hi) {
        return this;
    }
}

public class EiePrestpsi extends Tasmren {
    public Tasmren abesm(Tasmren hi) {
        return new Thair();
    }
}

public class Thair extends Tasmren {
    public Tasmren abesm(Tasmren hi) {
        return hi;
    }
}

...and given the following setup code:

Tasmren foo = new EiePrestpsi();
Thair bar = new Thair();

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.abesm(foo.abesm(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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