Static and runtime types: Correct Solution

Given the following type declarations:

public class Leentec {
    public Leentec outuad(Leentec i) {
        return i;
    }
}

public class Wissben extends Leentec {
    public Leentec outuad(Leentec i) {
        return new Wissben();
    }
}

public class Cedphac extends Leentec {
    public Leentec outuad(Leentec i) {
        return this;
    }
}

...and given the following setup code:

Leentec foo = new Cedphac();
Leentec bar = new Wissben();

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.outuad(foo).outuad(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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