ResilientSpring · ResilientSpring · Sep 30, 2023 · Sep 30, 2023 · Sep 30, 2023 · Sep 30, 2023
diff --git a/Chapter7/theoretical/Super_Class_References_and_Subclass_Objects_2.java b/Chapter7/theoretical/Super_Class_References_and_Subclass_Objects_2.java
@@ -0,0 +1,145 @@
+package theoretical;
+
+class TwoDShape_3{
+
+	private double width;
+	private double height;
+	String title;
+
+	public TwoDShape_3(double w, double h) {
+		width = w;
+		height = h;
+	}
+
+	public TwoDShape_3() {
+		// TODO Auto-generated constructor stub
+	}
+
+	TwoDShape_3(double width, double height, String title){
+
+		this.width = width;
+		this.height = height;
+		this.title = title;
+
+	}
+
+
+	// Construct object from an object.
+	TwoDShape_3(TwoDShape_3 ob){
+		width = ob.width;
+		height = ob.height;
+	}
+
+
+	double getWidth() {
+		return width;
+	}
+
+	double getHeight() {
+		return height;
+	}
+
+	void setWidth(double w) {
+		width = w;
+	}
+
+	void setHeight(double h) {
+		height = h;
+	}
+
+	void showDim() {
+
+		System.out.println("Width and height are " + width + " and " + height);
+	}
+
+	String showTitle() {
+		return title;
+	}
+
+	void showTitle_2() {
+		System.out.println("Triangle is also " + title);
+	}
+
+}
+
+
+class Triangle_3 extends TwoDShape_3{
+
+	private String style;
+
+	public Triangle_3() {
+		// TODO Auto-generated constructor stub
+	}
+
+	public Triangle_3(String s, double w, double h) {
+		super(w, h);
+
+		style = s;
+	}
+
+	Triangle_3(String style, String title, double width, double height){
+
+		super(width, height, title);
+
+		this.style = style;
+
+	}
+
+	Triangle_3(Triangle_3 ob){
+		super(ob);   // Pass a Triangle reference to TwoDShape's constructor.
+
+		style = ob.style;
+	}
+
+
+	double area() {
+		return getWidth() * getHeight() / 2;
+	}
+
+	void showStyle() {
+		System.out.println("Triangle is " + style);
+	}
+
+	String showTheTitle() {
+
+		return showTitle();
+
+	}
+
+	void showTheTitle_2() {
+		System.out.println("Triangle is also " + super.title);   // super is redundant here.
+	}
+
+	void showTheTitle_3() {
+		System.out.println("Triangle is also " + title);
+	}
+
+}
+
+
+public class Super_Class_References_and_Subclass_Objects_2 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		Triangle_3 t1 = new Triangle_3("Outlined", 8.0, 12.0);
+
+		// make a copy of t1
+		Triangle_3 t2 = new Triangle_3(t1);
+
+
+		System.out.println("Info for t1: ");
+		t1.showStyle();
+		t1.showDim();
+		System.out.println("Area is " + t1.area());
+
+		System.out.println();
+
+		System.out.println("Info for t2: ");
+		t2.showStyle();
+		t2.showDim();
+		System.out.println("Area is " + t2.area());
+
+	}
+
+}