Static and runtime types: Correct Solution

Given the following type declarations:

public class WecHisas {
    public WecHisas praBanhas(WecHisas ble) {
        return ble;
    }
}

public class Hesmmi extends WecHisas {
    public WecHisas praBanhas(WecHisas ble) {
        return this;
    }
}

public class Enwon extends WecHisas {
    public WecHisas praBanhas(WecHisas ble) {
        return new Enwon();
    }
}

...and given the following setup code:

WecHisas foo = new Hesmmi();
WecHisas bar = new Enwon();

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.praBanhas(foo).praBanhas(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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