MyLauncher.java
<code java>
package org.secmem.gwangju;

public class 우주정거장 {

	public void docking(우주왕복선 spaceShuttle) {
	
		System.out.println("Docked: " + spaceShuttle.getName());
	}

}

</code>

도킹.java
<code java>
package org.secmem.gwangju;

public interface 도킹 {

	public String getName();
	
}

</code>

소유즈우주선.java
<code java>
package org.secmem.gwangju;

public class 소유즈우주선 implements 도킹{

	@Override
	public String getName() {
		return "소유즈우주선";
	}
}

</code>

우주왕복선.java
<code java>
package org.secmem.gwangju;

public class 우주왕복선 implements 도킹{

	public String getName() {
		
		return "우주왕복선";
		
	}
}

</code>

우주정거장.java
<code java>
package org.secmem.gwangju;

public class 우주정거장 {

	public void docking(도킹 dockable) {
	
		System.out.println("Docked: " + dockable.getName());
	}

}

</code>