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    <p>In the example you gave you don't need two interfaces you only need the <code>Collideable</code> interface. The Collideable interface can be defined as follows:</p> <pre><code>interface Collideable { void collideWith(Collideable other); String getType(); } </code></pre> <p>Then <code>Spaceship</code>, <code>Plane</code>, and <code>Asteroid</code> would all implement <code>collideWith</code> and <code>getType</code>. As an example implementation, Spaceship's implementation would look like this:</p> <pre><code>class Spaceship implements Collideable { public void collideWith(Collideable other) { System.out.println(this.getType() + " collides with " + other.getType()); } public String getType(){ return "Spaceship"; } } </code></pre> <p>You can go one step further and declare Collideable as an abstract class, providing the implementation of collideWith since it is always the same. For example:</p> <pre><code>abstract class Collideable { void collideWith(Collideable other){ System.out.println(this.getType() + " collides with " + other.getType()); } String getType(); } </code></pre> <p>As a side note and general tip, your <code>Visitor</code> interface is poor design. The purpose of an interface is to define methods that <strong>all</strong> classes implementing that interface must provide a method definition (implementation) of. However your interface is very specific: it provides several types (<code>Spaceship</code>, <code>Asteroid</code>, etc) as method parameters. Therefore it is bad design, why did you even need that interface to begin with? It doesn't look like it can be used anywhere else. </p>
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    1. POseek better design to have multi-dispatching with java
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    1. COPlease look at the updated question. My question is more towards structure rather than string manipulation/output. Visitor pattern has to have visibility of concrete impl otherwise it won't compile.
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