Upload Tutorial 5

T5Q1/src/ClassA.java

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+public class ClassA {
+    public void print(int x, String y) {
+        System.out.println(x + " " + y);
+    }
+}

T5Q1/src/ClassB.java

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+public class ClassB extends ClassA {
+    public void print(int x) {
+        System.out.println(x);
+    }
+}

T5Q1/src/ClassC.java

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+public class ClassC extends ClassA {
+    public void print(String x, String y) {
+        System.out.println(x + " " + y);
+    }
+}

T5Q1/src/ClassD.java

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+public class ClassD extends ClassC {
+    public void print(String a, String b) {
+        System.out.println(a + " " + b);
+    }
+}

T5Q1/src/ClassE.java

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+public class ClassE extends ClassC {
+    public void print(String x) {
+        System.out.println(x);
+    }
+}

T5Q1/src/ClassF.java

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+public class ClassF extends ClassE {
+    public void print(int x) {
+        System.out.println(x);
+    }
+}

T5Q1/src/ClassG.java

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+public class ClassG extends ClassF {
+    public void print(String x) {
+        System.out.println(x);
+    }
+}

T5Q3/src/Polygon.java

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+public abstract class Polygon {
+//public class Polygon {
+    public enum KindofPolygon {
+        POLY_PLAIN,
+        POLY_RECT,
+        POLY_TRIANG
+    };
+    protected String name;
+    protected float width;
+    protected float height;
+    protected KindofPolygon polytype;
+
+    public Polygon(String theName, float theWidth, float theHeight) {
+        name = theName;
+        width = theWidth;
+        height = theHeight;
+        polytype = KindofPolygon.POLY_PLAIN;
+    }
+
+    public KindofPolygon getPolytype() {
+        return polytype;
+    }
+
+    public void setPolytype(KindofPolygon value) {
+        polytype = value;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+//    public float calArea() {
+//        return 0;
+//    }
+
+    public void printWidthHeight( ) {
+        System.out.println("Width = " + width + " Height = " + height);
+    }
+
+    public abstract float calArea();
+
+}

T5Q3/src/Rectangle.java

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+public class Rectangle extends Polygon {
+    public Rectangle(String theName, float theWidth, float theHeight) {
+        super(theName, theWidth, theHeight) ;
+        this.polytype = KindofPolygon.POLY_RECT;
+    }
+
+    public float calArea() {
+        return width * height;
+    }
+}

T5Q3/src/TestPolygon.java

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+public class TestPolygon {
+    public static void printArea(Rectangle rect) {
+        float area = rect.calArea();
+        System.out.println("The area of the " + rect.getPolytype() + " is " + area);
+    }
+
+    public static void printArea(Triangle tri) {
+        float area = tri.calArea();
+        System.out.println("The area of the " + tri.getPolytype() + " is " + area);
+    }
+
+    public static void main(String[] args ) {
+
+        Rectangle rect = new Rectangle("Rectangle", 3.0f, 4.0f);
+        printArea(rect);  // static binding
+        rect.printWidthHeight();
+
+        Triangle triangle= new Triangle("Triangle", 3.0f, 4.0f);
+        printArea(triangle); // static binding
+        triangle.printWidthHeight();
+    }
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+    public static void printArea(Polygon poly) {
+        float area = poly.calArea( );
+        System.out.println("The area of the " + poly.getPolytype()  + " is " + area);
+    }
+
+    public static void main2(String[] args ) {
+
+        Rectangle rect = new Rectangle("Rectangle", 3.0f, 4.0f);
+        printArea(rect);
+        rect.printWidthHeight();
+
+        Triangle triangle= new Triangle("Triangle", 3.0f, 4.0f);
+        printArea(triangle);
+        triangle.printWidthHeight();
+    }
+}

T5Q3/src/Triangle.java

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+public class Triangle extends Polygon {
+    public Triangle (String theName, float theWidth, float theHeight) {
+        super(theName, theWidth, theHeight) ;
+        this.polytype = KindofPolygon.POLY_TRIANG;
+    }
+
+    public float calArea() {
+        return 0.5f * width * height;
+    }
+}