Java Complete Notes (Copy Code Feature ke Saath!)

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello Duniya!");
    }
}

int age = 25;
double price = 99.99;
char grade = 'A';
boolean isJavaFun = true;

class Car {
    String color;
    void drive() {
        System.out.println("Driving...");
    }
}

public class Main {
    public static void main(String[] args) {
        Car myCar = new Car();
        myCar.color = "Red";
        myCar.drive(); // Output: Driving...
    }
}

try {
    int result = 10 / 0; // ArithmeticException
} catch (ArithmeticException e) {
    System.out.println("Zero se divide nahi kar sakte!");
} finally {
    System.out.println("Ye hamesha chalega.");
}

class MyThread extends Thread {
    public void run() {
        System.out.println("Thread chal raha hai...");
    }
}

ArrayList list = new ArrayList<>();
list.add("Apple");
list.remove(0);

class Box {
    T value;
    void setValue(T v) { this.value = v; }
}

interface Calculator {
    int operate(int a, int b);
}

Calculator add = (a, b) -> a + b;
System.out.println(add.operate(5, 3)); // Output: 8

try (BufferedReader br = new BufferedReader(new FileReader("file.txt"))) {
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }
} catch (IOException e) {
    e.printStackTrace();
}

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