├── src
    ├── devices
    │   ├── Scanner.java
    │   ├── Printer.java
    │   ├── ConcreteScanner.java
    │   ├── ConcretePrinter.java
    │   ├── Device.java
    │   └── ComboDevice.java
    └── application
    │   └── Program.java
├── .gitignore
├── .classpath
└── .project


/src/devices/Scanner.java:
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1 | package devices;
2 | 
3 | public interface Scanner {
4 | 
5 | 	String scan();
6 | }
7 | 


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/src/devices/Printer.java:
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1 | package devices;
2 | 
3 | public interface Printer {
4 | 
5 | 	void print(String doc);
6 | }
7 | 


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/.gitignore:
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 1 | # Compiled class file
 2 | *.class
 3 | 
 4 | # Log file
 5 | *.log
 6 | 
 7 | # BlueJ files
 8 | *.ctxt
 9 | 
10 | # Mobile Tools for Java (J2ME)
11 | .mtj.tmp/
12 | 
13 | # Package Files #
14 | *.jar
15 | *.war
16 | *.nar
17 | *.ear
18 | *.zip
19 | *.tar.gz
20 | *.rar
21 | 
22 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
23 | hs_err_pid*
24 | 
25 | # Eclipse
26 | .settings/
27 | 


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/.classpath:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <classpath>
 3 | 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-11">
 4 | 		<attributes>
 5 | 			<attribute name="module" value="true"/>
 6 | 		</attributes>
 7 | 	</classpathentry>
 8 | 	<classpathentry kind="src" path="src"/>
 9 | 	<classpathentry kind="output" path="bin"/>
10 | </classpath>
11 | 


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/src/devices/ConcreteScanner.java:
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 1 | package devices;
 2 | 
 3 | public class ConcreteScanner extends Device implements Scanner {
 4 | 
 5 | 	public ConcreteScanner(String serialNumber) {
 6 | 		super(serialNumber);
 7 | 	}
 8 | 
 9 | 	@Override
10 | 	public void processDoc(String doc) {
11 | 		System.out.println("Scanner processing: " + doc);
12 | 	}
13 | 
14 | 	@Override
15 | 	public String scan() {
16 | 		return "Scanned content";
17 | 	}
18 | }
19 | 


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/.project:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <projectDescription>
 3 | 	<name>course</name>
 4 | 	<comment></comment>
 5 | 	<projects>
 6 | 	</projects>
 7 | 	<buildSpec>
 8 | 		<buildCommand>
 9 | 			<name>org.eclipse.jdt.core.javabuilder</name>
10 | 			<arguments>
11 | 			</arguments>
12 | 		</buildCommand>
13 | 	</buildSpec>
14 | 	<natures>
15 | 		<nature>org.eclipse.jdt.core.javanature</nature>
16 | 	</natures>
17 | </projectDescription>
18 | 


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/src/devices/ConcretePrinter.java:
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 1 | package devices;
 2 | 
 3 | public class ConcretePrinter extends Device implements Printer {
 4 | 
 5 | 	public ConcretePrinter(String serialNumber) {
 6 | 		super(serialNumber);
 7 | 	}
 8 | 
 9 | 	@Override
10 | 	public void processDoc(String doc) {
11 | 		System.out.println("Printer processing: " + doc);
12 | 	}
13 | 
14 | 	@Override
15 | 	public void print(String doc) {
16 | 		System.out.println("Printing: " + doc);
17 | 	}
18 | }
19 | 


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/src/devices/Device.java:
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 1 | package devices;
 2 | 
 3 | public abstract class Device {
 4 | 
 5 | 	public String serialNumber;
 6 | 
 7 | 	public Device(String serialNumber) {
 8 | 		this.serialNumber = serialNumber;
 9 | 	}
10 | 	
11 | 	public String getSerialNumber() {
12 | 		return serialNumber;
13 | 	}
14 | 
15 | 	public void setSerialNumber(String serialNumber) {
16 | 		this.serialNumber = serialNumber;
17 | 	}
18 | 
19 | 	public abstract void processDoc(String doc);
20 | }
21 | 


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/src/devices/ComboDevice.java:
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 1 | package devices;
 2 | 
 3 | public class ComboDevice extends Device implements Scanner, Printer {
 4 | 
 5 | 	public ComboDevice(String serialNumber) {
 6 | 		super(serialNumber);
 7 | 	}
 8 | 
 9 | 	@Override
10 | 	public void print(String doc) {
11 | 		System.out.println("Combo printing: " + doc);
12 | 	}
13 | 
14 | 	@Override
15 | 	public String scan() {
16 | 		return "Combo scan result";
17 | 	}
18 | 
19 | 	@Override
20 | 	public void processDoc(String doc) {
21 | 		System.out.println("Combo processing: " + doc);
22 | 	}
23 | }
24 | 


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/src/application/Program.java:
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 1 | package application;
 2 | 
 3 | import devices.ComboDevice;
 4 | import devices.ConcretePrinter;
 5 | import devices.ConcreteScanner;
 6 | 
 7 | public class Program {
 8 | 
 9 | 	public static void main(String[] args) {
10 | 
11 | 		ConcretePrinter p = new ConcretePrinter("1080");
12 | 		p.processDoc("My Letter");
13 | 		p.print("My Letter");
14 | 
15 | 		System.out.println();
16 | 		ConcreteScanner s = new ConcreteScanner("2003");
17 | 		s.processDoc("My Email");
18 | 		System.out.println("Scan result: " + s.scan());
19 | 		
20 | 		System.out.println();
21 | 		ComboDevice c = new ComboDevice("2081");
22 | 		c.processDoc("My dissertation");
23 | 		c.print("My dissertation");
24 | 		System.out.println("Scan result: " + c.scan());
25 | 	}
26 | }
27 | 


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