Master In Programming Language(Core Java, Core )

print("Hello, World!")

# This is a comment

x = 5
name = "Alice"

int_num = 10 Integer
float_num = 10.5 Float

str_var = "Hello"

is_active = True

my_list = [1, 2, 3, "four"]

my_tuple = (1, 2, 3)

my_dict = {"name": "Alice", "age": 25}

if x > 10:
print("Greater than 10")
elif x == 10:
print("Equal to 10")
else:
print("Less than 10")

for i in range(5):
print(i)

while x < 10:
x += 1

def my_function(param1, param2):
return param1 + param2

add = lambda a, b: a + b

import math
from datetime import datetime

result = math.sqrt(16)

try:
x = 1 / 0
except ZeroDivisionError:
print("Cannot divide by zero!")

with open('file.txt', 'r') as file:
content = file.read()

with open('file.txt', 'w') as file:
file.write("Hello, World!")

squares = [x**2 for x in range(10)]

len(my_list)

sorted_list = sorted(my_list)

if 'four' in my_list:
print("Found!")

class Dog:
def __init__(self, name):
self.name = name
def bark(self):
return "Woof!"

str_var.lower()
str_var.upper()
str_var.split()

my_list.append(4)
my_list.remove(2)

public class Main {
public static void main(String[] args) {
// Your code goes here
System.out.println("Hello, World!");
}
}

int age = 25; // Variable declaration
final double PI = 3.14; // Constant declaration (final keyword)

if (condition) {
// Code if true
} else {
// Code if false
}

switch (variable) {
case 1:
// Code for case 1
break;
case 2:
// Code for case 2
break;
default:
// Default case

for (int i = 0; i < 5; i++) {
System.out.println(i);
}

int i = 0;
while (i < 5) {
System.out.println(i);
i++;
}

int i = 0;
do {
System.out.println(i);
i++;
} while (i < 5);

int[] numbers = {1, 2, 3, 4, 5}; // Array declaration
System.out.println(numbers[0]); // Accessing array element

public static returnType methodName(parameter1, parameter2) {
// Method body
return value;
}

public static int add(int a, int b) {
return a + b;
}
public static void main(String[] args) {
int result = add(5, 3);
System.out.println(result);
}

class Person {
String name;
int age;
void display() {
System.out.println("Name: " + name);
}
}

Person p1 = new Person();
p1.name = "John";
p1.age = 30;
p1.display();

class Person {
String name;
int age;
// Constructor
Person(String name, int age) {
this.name = name;
this.age = age;
}
void display() {
System.out.println("Name: " + name);
}
}
public class Main {
public static void main(String[] args) {
Person p1 = new Person("John", 30);
p1.display();
}
}

class Animal {
void eat() {
System.out.println("Eating...");
}
}
class Dog extends Animal {
void bark() {
System.out.println("Barking...");
}
}

public class Main {
public static void main(String[] args) {
Dog d = new Dog();
d.eat(); // Inherited method
d.bark(); // Dog method
}
}

class Animal {
void sound() {
System.out.println("Animal makes a sound");
}
}
class Dog extends Animal {
@Override
void sound() {
System.out.println("Dog barks");
}
}

Animal a = new Dog(); // Parent class reference, child class object
a.sound(); // Calls Dog's overridden method

interface Animal {
void eat();
}
class Dog implements Animal {
public void eat() {
System.out.println("Dog is eating");
}
}

public class Main {
public static void main(String[] args) {
Animal d = new Dog();
d.eat();
}
}

try {
// Code that may throw an exception
int result = 10 / 0;
} catch (ArithmeticException e) {
System.out.println("Error: " + e.getMessage());
} finally {
System.out.println("This block is always executed");
}

public static void checkAge(int age) throws Exception {
if (age < 18) {
throw new Exception("Age must be 18 or older");
}
}

import java.util.ArrayList;
ArrayList<String> list = new ArrayList<>();
list.add("Apple");
list.add("Banana");
System.out.println(list.get(0)); // Accessing element

import java.util.HashMap;
HashMap<String, Integer> map = new HashMap<>();
map.put("Apple", 1);
map.put("Banana", 2);
System.out.println(map.get("Apple")); // Accessing value

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
try {
File file = new File("filename.txt");
Scanner reader = new Scanner(file);
while (reader.hasNextLine()) {
String data = reader.nextLine();
System.out.println(data);
}
reader.close();
} catch (FileNotFoundException e) {
System.out.println("An error occurred.");
e.printStackTrace();
}
}
}

import java.io.FileWriter;
import java.io.IOException;
public class Main {
public static void main(String[] args) {
try {
FileWriter writer = new FileWriter("filename.txt");
writer.write("Hello, World!");
writer.close();
System.out.println("Successfully wrote to the file.");
} catch (IOException e) {
System.out.println("An error occurred.");
e.printStackTrace();
}
}
}

class MyThread extends Thread {
public void run() {
System.out.println("Thread is running");
}
}
public class Main {
public static void main(String[] args) {
MyThread t1 = new MyThread();
t1.start();
}
}

class MyRunnable implements Runnable {
public void run() {
System.out.println("Runnable is running");
}
}
public class Main {
public static void main(String[] args) {
Thread t1 = new Thread(new MyRunnable());
t1.start();
}
}

public class Main {
public static <T> void printArray(T[] array) {
for (T element : array) {
System.out.println(element);
}
}
public static void main(String[] args) {
Integer[] intArray = {1, 2, 3};
printArray(intArray);
}
}