Static and runtime types: Correct Solution

Given the following type declarations:

public class PraPiloi {
    public PraPiloi doocil(PraPiloi dipa) {
        return this;
    }
}

public class Chodgrint extends PraPiloi {
    public PraPiloi doocil(PraPiloi dipa) {
        return new Chodgrint();
    }
}

public class TreTrecie extends PraPiloi {
    public PraPiloi doocil(PraPiloi dipa) {
        return dipa;
    }
}

...and given the following setup code:

TreTrecie foo = new TreTrecie();
Chodgrint bar = new Chodgrint();

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.doocil(foo.doocil(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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• Static and runtime types: Correct Solution (wtei-owrw-odcr-z8ny)
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