Add Assignment 12

Assignement12/.classpath

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-14">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

Assignement12/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Assignement12</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

Assignement12/.settings/org.eclipse.jdt.core.prefs

@@ -0,0 +1,14 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=14
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=14
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=14

Assignement12/Lab12-Part-A.drawio

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+<mxfile host="Electron" modified="2020-11-15T04:09:32.474Z" agent="5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/13.7.9 Chrome/85.0.4183.121 Electron/10.1.3 Safari/537.36" etag="Qsv6C8H1Drkr9tHO2TkY" version="13.7.9" type="device"><diagram id="bmmjwFzcDrLNMM-SirQ1" name="Page-1">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</diagram></mxfile>

Assignement12/Lab12-Part-B.drawio

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+<mxfile host="Electron" modified="2020-11-15T16:58:23.106Z" agent="5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/13.7.9 Chrome/85.0.4183.121 Electron/10.1.3 Safari/537.36" etag="SDiABLDUwlX9_6uIxOXt" version="13.7.9" type="device"><diagram id="r-wSGhtTe-w-saC_SL-o" name="Page-1">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</diagram></mxfile>

Assignement12/src/A.java

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+
+public class A {
+	private int dataA;
+	public static boolean debug;
+
+	public A(int a) {
+		if (A.debug) {
+			System.out.println("constructor A is being called!");
+		}
+		this.dataA = a;
+	}
+
+	public void f() {
+
+		System.out.println("method f() from class A is being called");
+	}
+
+	public int g() {
+		return this.dataA + 1;
+	}
+}

Assignement12/src/B.java

@@ -0,0 +1,23 @@
+
+public class B extends A {
+	private int dataB;
+
+	public B(int a, int b) {
+		super(a);
+		if (A.debug) {
+			System.out.println("constructor B is being called!");
+		}
+		this.dataB = b;
+	}
+
+	@Override
+	public void f() {
+
+			System.out.println("method f() from class B is being called");
+	}
+
+	@Override
+	public int g() {
+		return 2 * super.g() + dataB;
+	}
+}

Assignement12/src/BorderDataDisplay.java

@@ -0,0 +1,15 @@
+
+public class BorderDataDisplay extends DataDisplay {
+
+	public BorderDataDisplay(String name, Data subject) {
+		super(name, subject);
+	}
+
+	@Override
+	public void update() {
+		System.out.println("*".repeat(25));
+		super.update();
+		System.out.println("*".repeat(25));
+	}
+
+}

Assignement12/src/C.java

@@ -0,0 +1,22 @@
+
+public class C extends B {
+	private int dataC;
+
+	public C(int a, int b, int c) {
+		super(a, b);
+		if (A.debug) {
+			System.out.println("constructor C is being called!");
+		}
+		this.dataC = c;
+	}
+
+	@Override
+	public void f() {
+		System.out.println("method f() from class B is being called");
+	}
+
+	@Override
+	public int g() {
+		return super.g() - 10 + dataC * 3;
+	}
+}

Assignement12/src/Data.java

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+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class Data {
+	
+	private ArrayList<DataDisplay> observers = new ArrayList<DataDisplay>();
+	private ArrayList<Integer> content;
+	
+	public Data() { 
+		content = new ArrayList<Integer>();
+	}
+	
+	public int[] getContent() {
+		int[] result = new int[content.size()];
+		for (int i = 0; i < result.length; i++) {
+			result[i] = content.get(i);
+		}
+		return result;
+	}
+	
+	public void addToContent(int x) {
+		content.add(x);
+		System.out.println("\nData: " + x + " is added.");
+		notifyAllObservers();
+	}
+	
+	public String toString() {
+		return Arrays.toString(content.toArray());
+	}
+	
+	public void attach(DataDisplay observer) {
+		observers.add(observer);
+	}
+	
+	public void notifyAllObservers() {
+		for (DataDisplay observer : observers) {
+			observer.update();
+		}
+	}
+}

Assignement12/src/DataDisplay.java

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+
+public class DataDisplay {
+	String name;
+	private Data dataToBeDisplayed;
+	
+	public DataDisplay(String name, Data subject) {
+		dataToBeDisplayed = subject;
+		this.name = name;
+	}
+	
+	public int[] getContent() {
+		return dataToBeDisplayed.getContent();
+	}
+	
+	public void update() {
+		System.out.println(getClass() + ": " + name);
+		System.out.println("\t" + dataToBeDisplayed);
+	}
+}

Assignement12/src/HistogramDataDisplay.java

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+import java.util.Arrays;
+
+public class HistogramDataDisplay extends DataDisplay {
+
+	public HistogramDataDisplay(String name, Data subject) {
+		super(name, subject);
+	}
+
+	@Override
+	public void update() {
+		System.out.println(getClass() + ": " + name);
+		int[] sortedArray = super.getContent();
+		Arrays.sort(sortedArray);
+		int lastVal = -1;
+		for (int i : sortedArray) {
+			if (i == lastVal)
+				System.out.print("*");
+			else {
+				System.out.format("%s%d\t*",(lastVal==-1)?"":"\n", i);
+				lastVal=i;
+			}
+		}
+		System.out.println();
+	}
+}

Assignement12/src/MaxDataDisplay.java

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+
+public class MaxDataDisplay extends DataDisplay {
+	int maxValue=0;
+	public MaxDataDisplay(String name, Data subject) {
+		super(name, subject);
+	}
+	@Override
+	public void update() {
+		System.out.println(getClass() + ": " + name);
+		for(int i : super.getContent()) this.maxValue = Math.max(this.maxValue, i);
+		System.out.println(this.maxValue);
+		
+	}
+	
+}

Assignement12/src/PartA.java

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+
+public class PartA {
+	public static void main(String[] args) {
+		testConstructor();
+		A a = new A(2);
+		A b = new B(3, 4);
+		A c = new C(5, 6, 7);
+		testF(a, b, c);
+		testG(a, b, c);
+		testA();
+		testB();
+		testC();
+	}
+	private static void testF(A a, A b, A c) {
+		System.out.println("--- Test f() of A, B, C ---");
+		a.f();
+		System.out.println("------------------------------");
+		b.f();
+		System.out.println("------------------------------");
+		c.f();
+		System.out.println("------------------------------");
+	}
+	private static void testG(A a, A b, A c) {
+		System.out.println("--- Test g() of A, B, C ------");
+		System.out.println(a.getClass() + ": " + a.g());
+		System.out.println("------------------------------");
+		System.out.println(b.getClass() + ": " + b.g());
+		System.out.println("------------------------------");
+		System.out.println(c.getClass() + ": " + c.g());
+		System.out.println("------------------------------");
+	}
+	public static void testConstructor() {
+		A.debug = true;
+		A a = new A(2);
+		System.out.println("------------------------------");
+		A b = new B(3, 4);
+		System.out.println("------------------------------");
+		A c = new C(5, 6, 7);
+		System.out.println("------------------------------");
+		A.debug = false;
+	}
+	
+	public static void testA() {
+		System.out.format("new A(2).g() -> %d, [expected] -> %d\n", new A(2).g(), 3);
+		System.out.format("new A(-1).g() -> %d, [expected] -> %d\n", new A(-1).g(), 0);
+		System.out.format("new A(-10).g() -> %d, [expected] -> %d\n", new A(-10).g(), -9);
+		System.out.format("new A(0).g() -> %d, [expected] -> %d\n", new A(0).g(), 1);
+	}
+	
+	public static void testB() {
+		System.out.format("new B(0, 0).g() -> %d, [expected] -> %d\n", new B(0, 0).g(), 2);	
+		System.out.format("new B(-2, 3).g() -> %d, [expected] -> %d\n", new B(-2, 3).g(), 1);	
+		System.out.format("new B(2, -3).g() -> %d, [expected] -> %d\n", new B(2, -3).g(), 3);	
+		System.out.format("new B(4, 5).g() -> %d, [expected] -> %d\n", new B(4, 6).g(), 16);	
+	}
+	
+	public static void testC() {
+		System.out.format("new C(0, 0, 0).g() -> %d, [expected] -> %d\n", new C(0, 0, 0).g(), -8);	
+		System.out.format("new C(2, 4, 3).g() -> %d, [expected] -> %d\n", new C(2, 4, 3).g(), 9);	
+		System.out.format("new C(-1, -3, -5).g() -> %d, [expected] -> %d\n", new C(-1, -3, 5).g(), 2);	
+		System.out.format("new C(5, 2, 10).g() -> %d, [expected] -> %d\n", new C(5, 2, 10).g(), 34);			
+	}
+}

Assignement12/src/PartB.java

@@ -0,0 +1,26 @@
+import java.util.Scanner;
+
+public class PartB {
+	public static void main(String[] args) {
+		Data d = new Data();
+		DataDisplay display = new DataDisplay("General Display", d);
+		DataDisplay maxDisplay = new MaxDataDisplay("MAX-Display", d);
+		DataDisplay histogram = new HistogramDataDisplay("Histogram", d);
+		DataDisplay border = new BorderDataDisplay("Display-with-border", d);
+		d.attach(display);
+		d.attach(maxDisplay);
+		d.attach(histogram);
+		d.attach(border);
+		
+		Scanner kbd = new Scanner(System.in);
+		while (true) {
+			System.out.println("------------------------------");
+			System.out.print("Enter an integer >= 0: ");
+			int x = kbd.nextInt();
+			if (x < 0) 
+				break;
+			d.addToContent(x);
+		}
+		System.out.println("--- FINISH ---");
+	}
+}