diff --git a/Chapter7/theoretical/Using_super_to_call_superclass_constructor_4.java b/Chapter7/theoretical/Using_super_to_call_superclass_constructor_4.java
index 16224c3..e58cc11 100644
--- a/Chapter7/theoretical/Using_super_to_call_superclass_constructor_4.java
+++ b/Chapter7/theoretical/Using_super_to_call_superclass_constructor_4.java
@@ -8,7 +8,8 @@ class TwoDShaper_4{
 	private String title;
 	
 	public TwoDShaper_4(double w, double h) {
-		// TODO Auto-generated constructor stub
+		width = w;
+		height = h;
 	}
 	
 	public TwoDShaper_4() {
@@ -52,7 +53,7 @@ String showTitle() {
 }
 
 
-class Triangular_4 extends TwoDShaper_3{
+class Triangular_4 extends TwoDShaper_4{
 	
 	private String style;
 	
@@ -103,7 +104,11 @@ public static void main(String[] args) {
 		
 		System.out.println("Info for t0: ");
 		t0.showStyle();
+		t0.setHeight(9);
+		t0.setWidth(3);
 		t0.showDim();
+		t0.showTitle();
+		t0.showTheTitle();
 		System.out.println("Area is " + t0.area());
 		
 		System.out.println();
diff --git a/Chapter7/theoretical/Using_super_to_call_superclass_constructor_5.java b/Chapter7/theoretical/Using_super_to_call_superclass_constructor_5.java
new file mode 100644
index 0000000..99fdeae
--- /dev/null
+++ b/Chapter7/theoretical/Using_super_to_call_superclass_constructor_5.java
@@ -0,0 +1,144 @@
+package theoretical;
+
+class TwoDShaper_5{
+	
+	private double width;
+	private double height;
+	String title;
+	
+	public TwoDShaper_5(double w, double h) {
+		width = w;
+		height = h;
+	}
+	
+	public TwoDShaper_5() {
+		// TODO Auto-generated constructor stub
+	}
+	
+	TwoDShaper_5(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;
+	}
+	
+	void showTitle_2() {
+		System.out.println("Triangle is also " + title);
+	}
+	
+}
+
+
+class Triangular_5 extends TwoDShaper_5{
+	
+	private String style;
+	
+	public Triangular_5() {
+		// TODO Auto-generated constructor stub
+	}
+	
+	public Triangular_5(String s, double w, double h) {
+		super(w, h);
+		
+		style = s;
+	}
+	
+	Triangular_5(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();
+		
+	}
+	
+	void showTheTitle_2() {
+		System.out.println("Triangle is also " + super.title);
+	}
+	
+}
+
+
+public class Using_super_to_call_superclass_constructor_5 {
+
+	public static void main(String[] args) {
+		Triangular_5 t0 = new Triangular_5();
+		Triangular_5 t1 = new Triangular_5("filled", 4.0, 4.0);
+		Triangular_5 t2 = new Triangular_5("outlined", 8.0, 12.0);
+		Triangular_5 t3 = new Triangular_5("Slovenly", "Classy", 8.0, 9.0);
+		
+		System.out.println("Info for t0: ");
+		t0.showStyle();
+		t0.setHeight(9);
+		t0.setWidth(3);
+		t0.showDim();
+		t0.showTitle();
+		t0.showTheTitle();
+		System.out.println("Area is " + t0.area());
+		
+		System.out.println();
+		
+		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_2();
+		t3.showTheTitle_2();
+		System.out.println("Area is " + t3.area());
+
+	}
+
+}
diff --git a/Chapter7/theoretical/Using_super_to_call_superclass_constructor_6.java b/Chapter7/theoretical/Using_super_to_call_superclass_constructor_6.java
new file mode 100644
index 0000000..a0f932b
--- /dev/null
+++ b/Chapter7/theoretical/Using_super_to_call_superclass_constructor_6.java
@@ -0,0 +1,151 @@
+package theoretical;
+
+
+class TwoDShaper_6{
+	
+	private double width;
+	private double height;
+	String title;
+	
+	public TwoDShaper_6(double w, double h) {
+		width = w;
+		height = h;
+	}
+	
+	public TwoDShaper_6() {
+		// TODO Auto-generated constructor stub
+	}
+	
+	TwoDShaper_6(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;
+	}
+	
+	void showTitle_2() {
+		System.out.println("Triangle is also " + title);
+	}
+	
+}
+
+
+class Triangular_6 extends TwoDShaper_6{
+	
+	private String style;
+	
+	public Triangular_6() {
+		// TODO Auto-generated constructor stub
+	}
+	
+	public Triangular_6(String s, double w, double h) {
+		super(w, h);
+		
+		style = s;
+	}
+	
+	Triangular_6(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();
+		
+	}
+	
+	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 Using_super_to_call_superclass_constructor_6 {
+
+	public static void main(String[] args) {
+		
+		Triangular_6 t0 = new Triangular_6();
+		Triangular_6 t1 = new Triangular_6("filled", 4.0, 4.0);
+		Triangular_6 t2 = new Triangular_6("outlined", 8.0, 12.0);
+		Triangular_6 t3 = new Triangular_6("Slovenly", "Classy", 8.0, 9.0);
+		
+		System.out.println("Info for t0: ");
+		t0.showStyle();
+		t0.setHeight(9);
+		t0.setWidth(3);
+		t0.showDim();
+		t0.showTitle();
+		t0.showTheTitle();
+		System.out.println("Area is " + t0.area());
+		
+		System.out.println();
+		
+		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_2();
+		t3.showTheTitle_2();
+		t3.showTheTitle_3();
+		System.out.println("Area is " + t3.area());
+		
+	}
+
+}