Session 9

Source Code

import java.util.*;

public class Session9 {
    public static void main(String[] args) {
        System.out.println("Session 9");
        
        
        // Example 1
        
        
        // Example 2
        
        
        // Example 3
        
        
        // Example 4
        
        
        // Example 5
        
        
        // Example 6
        
        
        // Example 7
        
        
        // Example 8
        
        
        // Example 9
        
        
        // Example 10
        
        
        // Example 11
        
        
        // Example 12
        
        
        // Example 13
        
        
        // Example 14
        
        
        // Example 15


    }
}

S9Problem1.java

import java.util.*;

public class S9Problem1 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 1");


    }
}

S9Problem2.java

import java.util.*;

public class S9Problem2 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 2");


    }
}

S9Problem3.java

import java.util.*;

public class S9Problem3 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 3");


    }
}

EmailDomain.java

import java.util.*;

public class EmailDomain
{
    public static String getDomain(String email)
    {
        // TODO: Use indexOf and substring only.
        // Example: "[email protected]" → "school.edu"
        String domain;
        

        return domain;
    }

    public static void main(String[] args)
    {
        // Do not change main!
        Scanner in = new Scanner(System.in);
        String email = in.nextLine();
        System.out.println("Domain: " + getDomain(email));
        in.close();
    }
}

FileExtension.java

import java.util.*;

public class FileExtension
{
    public static String getExtension(String fileName)
    {
        // TODO: Use indexOf and substring only.
        // Example: "photo.jpeg" → "jpeg"
        String ext;
 

        return ext;
    }

    public static void main(String[] args)
    {
        // Do not change main!
        Scanner in = new Scanner(System.in);
        String fileName = in.nextLine();
        System.out.println("Extension: " + getExtension(fileName));
        in.close();
    }
}

FirstSentence.java

import java.util.*;

public class FirstSentence
{
    public static String getFirstSentence(String paragraph)
    {
        // TODO: Use indexOf and substring only.
        // Assume sentences end with a period '.'
        // Return everything up to and including the first '.'
        // Example:
        // "Today is Monday. We have class." → "Today is Monday."
        String first;
        

        return first;
    }

    public static void main(String[] args)
    {
        // Do not change main!
        Scanner in = new Scanner(System.in);
        String paragraph = in.nextLine();
        System.out.println("First sentence: " + getFirstSentence(paragraph));
        in.close();
    }
}

AreaCode.java

import java.util.*;

public class AreaCode
{
    public static String getAreaCode(String phone)
    {
        // TODO: Use indexOf and substring only.
        // Assume the phone number format is "(###) ###-####"
        // Example: "[phone]" → "212"
        String code;
        

        return code;
    }

    public static void main(String[] args)
    {
        // Do not change main!
        Scanner in = new Scanner(System.in);
        String phone = in.nextLine();
        System.out.println("Area code: " + getAreaCode(phone));
        in.close();
    }
}

SecretPhrase.java

import java.util.*;

public class SecretPhrase
{
    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);

        // The secret phrase
        String secret = null;

        // --- Step 1: Give the user hints ---
        

        // --- Step 2: Let the user ask questions ---
        

        // --- Step 3: Let the user guess the phrase ---


        // --- Step 4: Compare using equals()


        in.close();
    }
}