public class Task230525 {
    public static void main(String[] args) {
        String str = "  Hello  ";
        str = str.trim().replace('H', 'J').substring(1, 4);
        System.out.println(str);
    }
}

public class Task260525 {
    public static void main(String[] args) {
        double d1 = 0.1 + 0.2;
        double d2 = 0.3;
        System.out.println(d1 == d2);
    }
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class Task270525 {
    public static void main(String[] args) {
        try (Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/test", "user", "pass");
             Statement stmt = conn.createStatement()) {
            
            conn.setAutoCommit(false);
            stmt.executeUpdate("INSERT INTO users VALUES (1, 'John')");
            stmt.executeUpdate("INSERT INTO users VALUES (1, 'Mike')");
            conn.commit();
            
        } catch (
                SQLException e) {
            System.out.println("Error occurred");
        }
    }
}

public class Task280525 {
    public static void main(String[] args) {
        float f = 16777216f;
        System.out.println(f == (f + 1f));
    }
}

public class Task290525 {
    public static void main(String[] args) {
        System.out.println(1.0 / 0.0);
    }
}

public class Task300525 {
    public static void main(String[] args) {
        char c = 'A';
        c += 1.5;
        System.out.println(c);
    }
}

public class Task020625 {
    public static void main(String[] args) {
        String s1 = new String("Java");
        String s2 = "Java";
        String s3 = s1.intern();
        
        System.out.println((s1 == s2) + " " + (s2 == s3));
    }
}

public class Task030625 {
    public static void main(String[] args) {
        boolean a = false;
        boolean b = true;
        boolean c = a != b == !b;
        System.out.println(c);
    }
}

public class Task040525 {
    public static void main(String[] args) {
        System.out.println('A' + 1.5F + "Java");
    }
}

public class Task050625 {
    public static void main(String[] args) {
        Object[] objects = new Object[3];
        objects[0] = 10;
        objects[1] = "Hello";
        objects[2] = new int[]{1, 2, 3};

        System.out.println(objects[0] instanceof Number);
        System.out.println(objects[1] instanceof CharSequence);
        System.out.println(objects[2] instanceof Object);
    }
}

import java.util.Optional;

public class Task060625 {
    public static void main(String[] args) {
        Optional<String> opt = Optional.ofNullable(null)
                                    .or(() -> Optional.of("Java"))
                                    .map(v -> ((String) v).toUpperCase());

        System.out.println(opt.orElse("Default"));
    }
}

public class Task090625 {
    public static void main(String[] args) {
        Object obj1 = new Object();
        Object obj2 = new Object();
        
        System.out.println(obj1 == obj2);
        System.out.println(obj1.equals(obj2));
    }
}

import java.util.stream.IntStream;

public class Task100625 {
    public static void main(String[] args) {
        int sum = IntStream.range(1, 5)
                         .peek(System.out::print)
                         .filter(i -> i % 2 == 0)
                         .sum();
        
        System.out.println(" sum=" + sum);
    }
}

public class Task110625 {
    public static void main(String[] args) {
        int a = 5;
        int b = 2;

        double result = a / b;
        System.out.println(result);
    }
}

import java.util.stream.Stream;

public class Task120625 {
    public static void main(String[] args) {
        long count = Stream.of(1, 2, 3, 4)
                .map(i -> {
                    System.out.print("m" + i + " ");
                    return i * 2;
                })
                .filter(i -> {
                    System.out.print("f" + i + " ");
                    return i > 3;
                })
                .count();

        System.out.println("\ncount=" + count);
    }
}

public class Task130625 {
    public static void main(String[] args) {
        String s1 = "Java";
        String s2 = new String("Java").intern();
        String s3 = new StringBuilder("Ja").append("va").toString();
        String s4 = s3.intern();
        
        System.out.println((s1 == s2) + " " + (s1 == s3) + " " + (s1 == s4));
    }
}