ResilientSpring · ResilientSpring · Oct 1, 2023 · Aug 18, 2023 · Aug 18, 2023 · Aug 18, 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());
+
+	}
+
+}
diff --git a/Miscellaneous/Cpp/Arrays_of_strings.java b/Miscellaneous/Cpp/Arrays_of_strings.java
@@ -0,0 +1,23 @@
+package Cpp;
+
+public class Arrays_of_strings {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		String numbers[][] = {
+
+				{"Tom", "555-3322"},
+				{"Mary", "555-8976"},
+				{"Jon", "555-1037"},
+				{"Rachel", "555-1400"},
+				{"Sherry", "555-8873"}
+		};
+
+		System.out.println("numbers[0]: " + numbers[0]);
+
+		System.out.println("numbers[0][1]: " + numbers[0][1]);
+
+	}
+
+}
diff --git a/Miscellaneous/Cpp/Assigning_Objects.java b/Miscellaneous/Cpp/Assigning_Objects.java
@@ -0,0 +1,56 @@
+package Cpp;
+
+class Test{
+
+	int a, b;
+
+	void set_ab(int a, int b) {
+
+		this.a = a;
+		this.b = b;
+
+	}
+
+	void show_ab() {
+
+		System.out.println("a is " + a + "\n");
+		System.out.println("b is " + b + "\n");		
+	}
+}
+
+public class Assigning_Objects {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		Test ob1 = new Test();
+		Test ob2 = new Test();
+
+
+		ob1.set_ab(10, 20);
+		ob2.set_ab(0, 0);
+
+		System.out.println("ob1 before assignment: ");
+		ob1.show_ab();
+		System.out.println("ob2 before assignment: ");
+		ob2.show_ab();
+		System.out.println();
+		ob2 = ob1;             // assign ob1 to ob2
+
+		System.out.println("ob1 after assignment: ");
+		ob1.show_ab();
+		System.out.println("ob2 after assignment: ");
+		ob2.show_ab();
+
+		System.out.println();
+
+		ob1.set_ab(-1, -1);   // change ob1
+
+		System.out.println("ob1 after changing ob1: ");
+		ob1.show_ab();
+		System.out.println("ob2 after changing ob1: ");
+		ob2.show_ab();
+
+	}
+
+}
diff --git a/Miscellaneous/Cpp/Passing_Objects_to_Functions.java b/Miscellaneous/Cpp/Passing_Objects_to_Functions.java
@@ -0,0 +1,54 @@
+package Cpp;
+
+class My_Class {
+
+	int value;
+
+	public My_Class(int value) {
+		// TODO Auto-generated constructor stub
+
+		this.value = value;
+	}
+
+	int get_value() {
+		return value;
+	}
+
+	void set_value(int value) {
+		this.value = value;
+	}
+
+	static void display(My_Class ob) {
+
+		System.out.println(ob.value);
+
+	}
+
+	static void change(My_Class ob) {
+		ob.set_value(100);
+		System.out.println("Value of ob inside: ");
+
+		display(ob);
+	}
+}
+
+public class Passing_Objects_to_Functions {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		My_Class a = new My_Class(10);
+
+		System.out.println("Value of a before calling change(): ");
+
+		My_Class.display(a);
+
+		My_Class.change(a);
+
+		System.out.println("Value of a after calling change(): ");
+
+		My_Class.display(a);
+
+	}
+
+}
diff --git a/Miscellaneous/Cpp/Reference_Variables_and_Assignment.java b/Miscellaneous/Cpp/Reference_Variables_and_Assignment.java
@@ -0,0 +1,36 @@
+package Cpp;
+
+class Car{
+
+	int passengers;
+	int fuelcap;
+	int mpg;
+
+}
+
+public class Reference_Variables_and_Assignment {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		Car vehicle1 = new Car();
+		Car vehicle2 = vehicle1;
+
+		vehicle1.mpg = 26;
+
+		System.out.println(vehicle1.mpg);
+		System.out.println(vehicle2.mpg);
+
+		//////////////////////////////////////
+
+		Car vehicle3 = new Car();
+
+		vehicle2 = vehicle3;
+
+		System.out.println(vehicle1.mpg);
+		System.out.println(vehicle2.mpg);
+		System.out.println(vehicle3.mpg);
+
+	}
+
+}
diff --git a/Miscellaneous/Cpp/Reference_Variables_and_Assignment_2.java b/Miscellaneous/Cpp/Reference_Variables_and_Assignment_2.java
@@ -0,0 +1,29 @@
+package Cpp;
+
+class Car2{
+
+	int passengers;
+	int fuelcap;
+	int mpg;
+
+}
+
+public class Reference_Variables_and_Assignment_2 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Car2 vehicle1 = new Car2();
+		Car2 vehicle2;
+
+		vehicle2 = vehicle1;
+
+		vehicle1.mpg = 26;
+
+		System.out.println(vehicle1.mpg);
+		System.out.println(vehicle2.mpg);
+
+		System.out.println();
+
+	}
+
+}