class A300625 {
    { System.out.print("1"); }
    public A300625() { System.out.print("2"); }
}

class B300625 extends A300625 {
    { System.out.print("3"); }
    public B300625() { System.out.print("4"); }
}

public class Task300625 {
    public static void main(String[] args) {
        new B300625();
    }
}

public class Task010725 {
    public static void main(String[] args) {
        final int a = 10;
        final int b = 20;
        byte c = a + b;
        System.out.println(c);
    }
}

public class Task020725 {
    
    static void modify(int x) {
        x = x + 10;
    }
    
    public static void main(String[] args) {
        int num = 5;
        modify(num);
        System.out.println(num);
    }
}

public class Task030725 {
    private static int counter = 0;

    public static void main(String[] args) throws InterruptedException {
        Runnable task = () -> {
            for (int i = 0; i < 1_000_000; i++) {
                counter++;
            }
        };

        Thread t1 = new Thread(task);
        Thread t2 = new Thread(task);

        t1.start();
        t2.start();

        t1.join();
        t2.join();

        System.out.println(counter);
    }
}

class Parent040725 {
    private void print() {
        System.out.println("Parent");
    }
}

class Child040725 extends Parent040725 {
    public void print() {
        System.out.println("Child");
    }
}

public class Task040725 {
    public static void main(String[] args) {
        Parent040725 obj = new Child040725();
        obj.print();
    }
}

public class Task070725 {
    public static void main(String[] args) {
        String[] arr1 = {"A", "B", "C"};
        String[] arr2 = arr1;
        arr2[1] = "X";
        
        System.out.println(arr1[1]);
    }
}

public class Task080725 {
    public static void main(String[] args) {
        int String = 10;
        System.out.println(String);
    }
}

import java.util.function.Function;

public class Task090725 {
    public static void main(String[] args) {
        Function<Integer, Integer> f = x -> x * 2;
        Function<Integer, Integer> g = x -> x + 3;
        
        System.out.println(f.compose(g).apply(5));
        System.out.println(f.andThen(g).apply(5));
    }
}

public class Task100725 {
    public static void main(String[] args) {
        int x = 1;
        int y = x++ + x++ + ++x;
        System.out.println("x = " + x);
        System.out.println("y = " + y);
    }
}

public class Task110725 {
    public static void main(String[] args) {
        int a = 1;
        int b = a << 2 + a++ * --a;
        System.out.println(b);
    }
}

public class Task140725 {
    public static void main(String[] args) {
        int a = 1 << 31;
        int b = a >> 31;
        int c = a >>> 31;
        
        System.out.println(b + " " + c);
    }
}

public class Task150725 {
    public static void main(String[] args) {
        new Child150725();
    }
}

class Parent150725 {
    Parent150725() {
        System.out.println("Parent: " + getClass().getSimpleName());
    }
}

class Child150725 extends Parent150725 {
    Child150725() {
        System.out.println("Child: " + getClass().getSimpleName());
    }
}

class Parent160725 {
    void print() {
        System.out.println("Parent160725");
    }
}

class Child160725 extends Parent160725 {
    void print() {
        System.out.println("Child160725");
    }
}

public class Task160725 {
    public static void main(String[] args) {
        Parent160725 obj = new Child160725();
        obj.print();
    }
}

public class Task170725 {
    static void process(int x) {
        System.out.println("int");
    }
    
    static void process(Integer x) {
        System.out.println("Integer");
    }
    
    static void process(Object x) {
        System.out.println("Object");
    }
    
    public static void main(String[] args) {
        process(10);
        process(Integer.valueOf(10));
        process(null);
    }
}

import java.util.Optional;

public class Task180725 {
    public static void main(String[] args) {
        Optional<Object> opt = Optional.of("Java")
                                    .filter(s -> s.startsWith("J"))
                                    .map(s -> null)
                                    .or(() -> Optional.of("Fallback"));
        
        System.out.println(opt.get());
    }
}

public class Task210725 {
    static int x = 5;
    
    static {
        x = 10;
    }
    
    public static void main(String[] args) {
        System.out.println(x);
        
        int x = 20;
        System.out.println(x);
        
        System.out.println(Task210725.x);
    }
}

public class Task220725 {
    public static void main(String[] args) {
        final int x;
        try {
            x = 10;
            throw new RuntimeException();
        } catch (Exception e) {
            System.out.print(x + " ");
        } finally {
            x = 20;
            System.out.print(x);
        }
    }
}