1. Write a complete Java method called sumNums that takes no parameters and retu

Question

1. Write a complete Java method called sumNums that takes no parameters and returns an integer.
The method uses a do-while loop to ask the user to enter a series of positive integer values and keeps a running total.
Use a sentinel (-1) to allow the user to indicate when they are finished.
The method returns the total.

2. Write a complete Java method called checkPassword that takes a String as
a parameter (password) and returns a boolean. First, check that the password is
at least 8 characters long. Then use a while loop to check that the
password contains at least one digit. If the password has the correct length
and contains a digit, return true, otherwise return false

3. Write a complete Java method called authenticate that takes two Strings (username, password)
as parameters and returns a boolean. If the username parameter has the value "Chucky" and
the password parameter has the value "Cheese1", return true. Otherwise return false.

4. Write a complete Java method called getScoreSheet that takes two ints
as parameters (rows and columns) and constructs a 2-dimensional array
of doubles (calles scores) with a size based on the rows and columns parameters.
Use a nested loop to initialize each value in the array to 100.00.
The method returns the scores array.

5. Write a complete Java method called writeList that takes an ArrayList of Strings as a parameter
and writes each String as a line in a text file.
Make sure to handle the Exception that might be thrown and print the error message to the
command line.

Explanation / Answer

1.

import java.util.*;

class sumNumTest
{
   public static int sumNums()
   {
       int i=0,s=0,n;
      
       Scanner scan = new Scanner(System.in);

       do
       {
           System.out.println("Enter Number");
           n=scan.nextInt();
           if(n>0)
               s=s+n;
           else
               return s;
       }while(true);
   }

   public static void main(String args[])
   {
       int s=sumNums();
       System.out.println("Sum is ="+s);
   }
}

2.

import java.util.*;

class passwordTest
{
   public static boolean checkPassword(String p)
   {
       int n=p.length();

       if(p.contains("[0-9]+") && n>8)
           return true;
       else
           return false;
   }

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

       System.out.println("Enter Password");
       String p=scan.next();
       if(checkPassword(p))
      
           System.out.println("Password is correct");
       else
           System.out.println("Password is incorrect");
   }
}

3.

import java.util.*;

class passwordTest
{
   public static boolean autheticate(String u, String p)
   {

       if(u.equals("Chucky") && p.equals("Cheese1")
           return true;
       else
           return false;
   }

   public static void main(String args[])
   {
       Scanner scan = new Scanner(System.in);
       System.out.println("Enter Username");
       String u = scan.next();
       System.out.println("Enter Password");

       String p=scan.next();
       if(autheticate(u, p))
      
           System.out.println("USer Authenticated successfull");
       else
           System.out.println("User Authentication failed");
   }
}

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.