Java: An Introduction to Problem Solving and Programming (7th Edition)
Java: An Introduction to Problem Solving and Programming (7th Edition)
7th Edition
ISBN: 9780133766264
Author: Walter Savitch
Publisher: PEARSON
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Chapter 9, Problem 3E

Explanation of Solution

Exception class:

The exception class to find whether the time entered is valid or not. The time should be in the format “hour:minute” followed by “am” or “pm”.

InvalidFormattingException.java:

//Create a class that extends Exception

public class InvalidFormattingException extends Exception

{

    //Define a parameterized constructor

    public InvalidFormattingException(String reason)

    {

//Call the parent class's method by passing a message

        super(reason);

    }

}

Explanation:

The above class “InvalidFormattingException” occurs when the time entered by the user in invalid.

Complete program:

Main.java:

//Import required packages

import java.util.*;

import java.util.Scanner;

//Define the main class

class Main

{

    //Declare required variables

    private int hour, minute;

    private boolean isAM;

    //Constructor

    public Main()

    {

        //Instantiate the values

        hour = 0;

        minute = 0;

        isAM = false;

    }

    //Function definition to set the time

public void setTimeTo(String aTime) throws InvalidFormattingException

    {

        //Declare required variables

        int hourFound;

        int minuteFound;

        String indicatorFound;

        //Create an object for the scanner class

        Scanner reader = new Scanner(aTime);

        //Split using the delimiter

        reader.useDelimiter(":");

        //Try block

        try

        {

            //Assign the hour

            hourFound = reader.nextInt();

        }

        //Catch the exception

        catch (Exception e)

        {

            //Throw the exception with a message

throw new InvalidFormattingException("Hour not an integer");

        }

        //Get the remaining string

        String restOfString = reader.next();

        reader = new Scanner(restOfString);

        //Remove the last two characters

        if(restOfString.length()<3)

            //Throw the exception

throw new InvalidFormattingException("Bad format");

        //Get the substring

String minuteString = restOfString.substring(0, restOfString.length()-2);

        //Get the substring

String amString = restOfString.substring(restOfString.length()-2);

        //Try block

        try

        {

            //Convert the minute to integer

minuteFound = Integer.parseInt(minuteString);

        }

        //Catch the exception

        catch (Exception e)

        {

            //Throw the exception

throw new InvalidFormattingException("Minute not an integer");

        }

        //Check condition

if(!amString.equals("am") && !amString.equals("pm"))

            //Throw the exception with a message

throw new InvalidFormattingException("Did not have am/pm");

        //Assign the value

        hour = hourFound;

        //Assign the value

        minute = minuteFound;

        //Check if the string is am

        if(amString...

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Students have asked these similar questions
Write an exception class that is appropriate for indicating that a time enteredby a user is not valid. The time will be in the format hour:minute followed by“am” or “pm.”
python Write a program that calculates an adult's fat-burning heart rate, which is 70% of 220 minus the person's age. Complete fat_burning_heart_rate() to calculate the fat burning heart rate. The adult's age must be between the ages of 18 and 75 inclusive. If the age entered is not in this range, raise a ValueError exception in get_age() with the message "Invalid age." Handle the exception in __main__ and print the ValueError message along with "Could not calculate heart rate info." Ex: If the input is: 35 the output is: Fat burning heart rate for a 35 year-old: 129.5 bpm If the input is: 17 the output is: Invalid age. Could not calculate heart rate info. # here is the script I have but its not working   def get_age():age = int(input())age=int(input("Enter the age:"))if age<18 or age>75:raise ValueError('Invalid age.')return age # TODO: Complete fat_burning_heart_rate() functiondef fat_burning_heart_rate(age):heart_rate=(220-age)*.70return heart_rate if __name__ == "__main__":#…
Write a program that calculates an adult's fat-burning heart rate, which is 70% of 220 minus the person's age. Complete fat_burning_heart_rate() to calculate the fat burning heart rate. The adult's age must be between the ages of 18 and 75 inclusive. If the age entered is not in this range, raise a ValueError exception in get age() with the message "Invalid age." Handle the exception in _main_ and print the ValueError message along with "Could not calculate heart rate info." Ex: If the input is: 35 the output is: Fat burning heart rate for a 35 year-old: 129.5 bpm If the input is: 17 the output is: Invalid age. Could not calculate heart rate info.

Chapter 9 Solutions

Java: An Introduction to Problem Solving and Programming (7th Edition)

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