diff --git a/Chapter7/theoretical/Using_super_to_call_superclass_constructor.java b/Chapter7/theoretical/Using_super_to_call_superclass_constructor.java
new file mode 100644
index 0000000..9e3e923
--- /dev/null
+++ b/Chapter7/theoretical/Using_super_to_call_superclass_constructor.java
@@ -0,0 +1,83 @@
+package theoretical;
+
+class TwoDShaper{
+	
+	private double width;
+	private double height;
+	
+	public TwoDShaper(double w, double h) {
+		// TODO Auto-generated constructor stub
+	}
+	
+	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);
+	}
+	
+}
+
+
+class Triangular extends TwoDShaper{
+	
+	private String style;
+	
+	public Triangular(String s, double w, double h) {
+		super(w, h);
+		
+		style = s;
+	}
+	
+	double area() {
+		return getWidth() * getHeight() / 2;
+	}
+	
+	void showStyle() {
+		System.out.println("Triangle is " + style);
+	}
+}
+
+public class Using_super_to_call_superclass_constructor {
+
+	public static void main(String[] args) {
+		
+		Triangular t1 = new Triangular("filled", 4.0, 4.0);
+		Triangular t2 = new Triangular("outlined", 8.0, 12.0);
+		
+		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());		
+		
+		System.out.println();
+		
+		System.out.println("Info for t2: ");
+		t2.showStyle();
+		t2.showDim();
+		System.out.println("Area is " + t2.area());
+
+	}
+
+}
diff --git a/Chapter7/theoretical/Using_super_to_call_superclass_constructor_2.java b/Chapter7/theoretical/Using_super_to_call_superclass_constructor_2.java
new file mode 100644
index 0000000..1efe849
--- /dev/null
+++ b/Chapter7/theoretical/Using_super_to_call_superclass_constructor_2.java
@@ -0,0 +1,122 @@
+package theoretical;
+
+class TwoDShaper_2{
+	
+	private double width;
+	private double height;
+	private String title;
+	
+	public TwoDShaper_2(double w, double h) {
+		// TODO Auto-generated constructor stub
+	}
+	
+	public TwoDShaper_2() {
+		// TODO Auto-generated constructor stub
+	}
+	
+	TwoDShaper_2(double width, double height, String title){
+		
+		this.width = width;
+		this.height = height;
+		this.title = title;
+		
+	}
+	
+	
+	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;
+	}
+	
+}
+
+
+class Triangular_2 extends TwoDShaper_2{
+	
+	private String style;
+	
+	public Triangular_2() {
+		// TODO Auto-generated constructor stub
+	}
+	
+	public Triangular_2(String s, double w, double h) {
+		super(w, h);
+		
+		style = s;
+	}
+	
+	Triangular_2(String style, String title, double width, double height){
+		
+		super(width, height, title);
+		
+		this.style = style;
+		
+	}
+	
+	double area() {
+		return getWidth() * getHeight() / 2;
+	}
+	
+	void showStyle() {
+		System.out.println("Triangle is " + style);
+	}
+	
+	String showTitle() {
+		
+		return showTitle();
+		
+	}
+	
+}
+
+
+public class Using_super_to_call_superclass_constructor_2 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Triangular_2 t1 = new Triangular_2("filled", 4.0, 4.0);
+		Triangular_2 t2 = new Triangular_2("outlined", 8.0, 12.0);
+		Triangular_2 t3 = new Triangular_2("Slovenly", "Classy", 8.0, 9.0);
+		
+		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());		
+		
+		System.out.println();
+		
+		System.out.println("Info for t3: ");
+		t3.showStyle();
+		t3.showDim();
+		t3.showTitle();
+		System.out.println("Area is " + t3.area());
+	}
+
+}
diff --git a/Chapter7/theoretical/Using_super_to_call_superclass_constructor_3.java b/Chapter7/theoretical/Using_super_to_call_superclass_constructor_3.java
new file mode 100644
index 0000000..e974c2a
--- /dev/null
+++ b/Chapter7/theoretical/Using_super_to_call_superclass_constructor_3.java
@@ -0,0 +1,127 @@
+package theoretical;
+
+
+class TwoDShaper_3{
+	
+	private double width;
+	private double height;
+	private String title;
+	
+	public TwoDShaper_3(double w, double h) {
+		// TODO Auto-generated constructor stub
+	}
+	
+	public TwoDShaper_3() {
+		// TODO Auto-generated constructor stub
+	}
+	
+	TwoDShaper_3(double width, double height, String title){
+		
+		this.width = width;
+		this.height = height;
+		this.title = title;
+		
+	}
+	
+	
+	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;
+	}
+	
+}
+
+
+
+class Triangular_3 extends TwoDShaper_3{
+	
+	private String style;
+	
+	public Triangular_3() {
+		// TODO Auto-generated constructor stub
+	}
+	
+	public Triangular_3(String s, double w, double h) {
+		super(w, h);
+		
+		style = s;
+	}
+	
+	Triangular_3(String style, String title, double width, double height){
+		
+		super(width, height, title);
+		
+		this.style = style;
+		
+	}
+	
+	double area() {
+		return getWidth() * getHeight() / 2;
+	}
+	
+	void showStyle() {
+		System.out.println("Triangle is " + style);
+	}
+	
+	String showTheTitle() {
+		
+		return showTitle();
+		
+	}
+	
+}
+
+
+
+public class Using_super_to_call_superclass_constructor_3 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Triangular_3 t1 = new Triangular_3("filled", 4.0, 4.0);
+		Triangular_3 t2 = new Triangular_3("outlined", 8.0, 12.0);
+		Triangular_3 t3 = new Triangular_3("Slovenly", "Classy", 8.0, 9.0);
+		
+		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());		
+		
+		System.out.println();
+		
+		System.out.println("Info for t3: ");
+		t3.showStyle();
+		t3.showDim();
+		t3.showTitle();
+		t3.showTheTitle();
+		System.out.println("Area is " + t3.area());
+
+	}
+
+}