Revision of Java Intro level 0

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javaintro.md

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1		-	# VERRY Basic Introduction to Java Programming
	1	+	# VERRRRRRY Basic Introduction to Java Programming
2	2
3	3		## 1. Basic Program Structure
4	4		Every Java program starts with a class, and the main method is the entry point of the program. Here's a simple example:

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javaintro.md

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1		-	# Introduction to Java Programming
	1	+	# VERRY Basic Introduction to Java Programming
2	2
3	3		## 1. Basic Program Structure
4	4		Every Java program starts with a class, and the main method is the entry point of the program. Here's a simple example:

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javaintro.md

			@@ -118,6 +118,9 @@ public class ArrayExample {
118	118		Methods help you organize code into reusable blocks:
119	119
120	120		```java
	121	+	//
	122	+	// If you put all this into a filename `Methods.java`
	123	+	//
121	124		public class Methods {
122	125		public static void main(String[] args) {
123	126		// Calling methods
			@@ -140,7 +143,8 @@ public class Methods {
140	143
141	144		These examples cover the fundamental concepts you'll need to start programming in Java. Remember to:
142	145		- Save each class in a separate file with the same name as the class
143		-	- Compile your code using `javac FileName.java`
144		-	- Run your program using `java FileName`
	146	+	- So to try `Methods.java`
	147	+	- Compile your code using `javac Methods.java`
	148	+	- Run your program using `java Methods`
145	149
146	150		Practice with these examples and modify them to experiment with different values and behaviors. This hands-on experience will help solidify your understanding of Java basics.

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1	+	# Introduction to Java Programming
2	+
3	+	## 1. Basic Program Structure
4	+	Every Java program starts with a class, and the main method is the entry point of the program. Here's a simple example:
5	+
6	+	```java
7	+	public class HelloWorld {
8	+	public static void main(String[] args) {
9	+	System.out.println("Hello, World!");
10	+	}
11	+	}
12	+	```
13	+
14	+	This structure is fundamental to Java:
15	+	- `public class`: Declares a class that can be accessed from anywhere
16	+	- `static void main(String[] args)`: The main method that runs when you execute the program
17	+	- `System.out.println()`: Prints text to the console
18	+
19	+	## 2. Variables and Data Types
20	+	Java is a strongly-typed language, meaning you must declare the type of each variable. Here are the basic data types:
21	+
22	+	```java
23	+	public class Variables {
24	+	public static void main(String[] args) {
25	+	// Numeric types
26	+	int age = 25; // Whole numbers
27	+	double price = 19.99; // Decimal numbers
28	+
29	+	// Text
30	+	char grade = 'A'; // Single character
31	+	String name = "John Doe"; // Text string
32	+
33	+	// Boolean
34	+	boolean isStudent = true; // true or false
35	+
36	+	// Printing variables
37	+	System.out.println("Name: " + name);
38	+	System.out.println("Age: " + age);
39	+	System.out.println("Grade: " + grade);
40	+	}
41	+	}
42	+	```
43	+
44	+	## 3. Control Flow Statements
45	+	Control flow statements help you make decisions and repeat actions in your code.
46	+
47	+	### If-Else Statements
48	+	```java
49	+	public class ControlFlow {
50	+	public static void main(String[] args) {
51	+	int score = 85;
52	+
53	+	if (score >= 90) {
54	+	System.out.println("Excellent!");
55	+	} else if (score >= 80) {
56	+	System.out.println("Good job!");
57	+	} else {
58	+	System.out.println("Keep practicing!");
59	+	}
60	+	}
61	+	}
62	+	```
63	+
64	+	### Loops
65	+	```java
66	+	public class Loops {
67	+	public static void main(String[] args) {
68	+	// For loop
69	+	System.out.println("Counting with for loop:");
70	+	for (int i = 1; i <= 5; i++) {
71	+	System.out.println("Count: " + i);
72	+	}
73	+
74	+	// While loop
75	+	System.out.println("\nCounting with while loop:");
76	+	int count = 1;
77	+	while (count <= 5) {
78	+	System.out.println("Count: " + count);
79	+	count++;
80	+	}
81	+	}
82	+	}
83	+	```
84	+
85	+	## 4. Arrays
86	+	Arrays allow you to store multiple values of the same type:
87	+
88	+	```java
89	+	public class ArrayExample {
90	+	public static void main(String[] args) {
91	+	// Declaring and initializing an array
92	+	int[] numbers = {1, 2, 3, 4, 5};
93	+
94	+	// Accessing array elements
95	+	System.out.println("First number: " + numbers[0]);
96	+
97	+	// Array iteration
98	+	System.out.println("\nAll numbers:");
99	+	for (int number : numbers) {
100	+	System.out.println(number);
101	+	}
102	+
103	+	// Creating an array of strings
104	+	String[] fruits = new String[3];
105	+	fruits[0] = "Apple";
106	+	fruits[1] = "Banana";
107	+	fruits[2] = "Orange";
108	+
109	+	System.out.println("\nFruits:");
110	+	for (String fruit : fruits) {
111	+	System.out.println(fruit);
112	+	}
113	+	}
114	+	}
115	+	```
116	+
117	+	## 5. Methods
118	+	Methods help you organize code into reusable blocks:
119	+
120	+	```java
121	+	public class Methods {
122	+	public static void main(String[] args) {
123	+	// Calling methods
124	+	greet("Alice");
125	+	int sum = add(5, 3);
126	+	System.out.println("Sum: " + sum);
127	+	}
128	+
129	+	// Method with no return value (void)
130	+	public static void greet(String name) {
131	+	System.out.println("Hello, " + name + "!");
132	+	}
133	+
134	+	// Method that returns a value
135	+	public static int add(int a, int b) {
136	+	return a + b;
137	+	}
138	+	}
139	+	```
140	+
141	+	These examples cover the fundamental concepts you'll need to start programming in Java. Remember to:
142	+	- Save each class in a separate file with the same name as the class
143	+	- Compile your code using `javac FileName.java`
144	+	- Run your program using `java FileName`
145	+
146	+	Practice with these examples and modify them to experiment with different values and behaviors. This hands-on experience will help solidify your understanding of Java basics.

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