Task #1 Character and String Class Methods 1. Copy the files Time.java (code listing 9.1) and...
Task #1 Character and String Class Methods
1. Copy the files Time.java (code listing 9.1) and TimeDemo.java (code listing 9.2)
from the StudentCD or as directed by your instructor.
2. In the Time.java file, add conditions to the decision structure which validates the
data. Conditions are needed that will
a. Check the length of the string
b. Check the position of the colon
c. Check that all other characters are digits
3. Add lines that will separate the string into two substrings containing hours and
minutes. Convert these substrings to integers and save them into the instance
variables.
4. In the TimeDemo class, add a condition to the loop that converts the user
Homework Answers
//TASK1
//Time.java
public class Time
{
/**hours in conventional time*/
private int hours;
/**minutes in conventional time*/
private int minutes;
/**true if afternoon time, false if morning time*/
private boolean afternoon;
/**Constructs a cutomary time (12 hours, am or pm)
from a military time ##:##
@param militaryTime time in the military format ##:##*/
public Time(String militaryTime)
{
//Check to make sure something was entered
if (militaryTime == null)
{
System.out.println(
"You must enter a valid miliary time." );
}
//Check to make sure there are 5 characters
else if (militaryTime.length()!=5)
{
System.out.println(militaryTime +
" is not a valid miliary time." );
}
else
{
//Check to make sure the colon is in
//the correct spot
if (militaryTime.charAt(2)!=':')
{
System.out.println(militaryTime +
" is not a valid miliary time." );
}
//Check to make sure all other characters are digits
else if (!Character.isDigit(militaryTime.charAt(0)))
{
System.out.println(militaryTime +
" is not a valid miliary time." );
}
else if (!Character.isDigit(militaryTime.charAt(1)))
{
System.out.println(militaryTime +
" is not a valid miliary time." );
}
else if (!Character.isDigit(militaryTime.charAt(3)))
{
System.out.println(militaryTime +
" is not a valid miliary time." );
}
else if (!Character.isDigit(militaryTime.charAt(4)))
{
System.out.println(militaryTime +
" is not a valid miliary time." );
}
else
{
//SEPARATE THE STRING INTO THE HOURS
//AND THE MINUTES, CONVERTING THEM TO
//INTEGERS AND STORING INTO THE
//INSTANCE VARIABLES
//validate hours and minutes are valid values
hours=Integer.parseInt( militaryTime.substring(0,2));
minutes=Integer.parseInt(militaryTime.substring(3,5));
if(hours > 23)
{
System.out.println(militaryTime +
" is not a valid miliary time." );
}
else if(minutes > 59)
{
System.out.println(militaryTime +
" is not a valid miliary time." );
}
//convert military time to conventional time
//for afternoon times
else if (hours > 12)
{
hours = hours - 12;
afternoon = true;
System.out.println(this.toString());
}
//account for midnight
else if (hours == 0)
{
hours = 12;
System.out.println(this.toString());
}
//account for noon
else if (hours == 12)
{
afternoon = true;
System.out.println(this.toString());
}
//morning times don't need converting
else
{
System.out.println(this.toString());
}
}
}
}
/**toString method returns a conventional time
@return a conventional time with am or pm*/
public String toString()
{
String am_pm;
String zero = "";
if (afternoon)
am_pm = "PM";
else
am_pm = "AM";
if (minutes < 10)
zero = "0";
return hours + ":" + zero + minutes + " " + am_pm;
}
}
//TimeDemo.java
import java.util.Scanner;
public class TimeDemo
{
public static void main (String [ ] args)
{
Scanner keyboard = new Scanner(System.in);
char answer = 'Y';
String enteredTime;
String response;
while (Character.toUpperCase(answer)=='Y')
{
System.out.print(
"Enter a miitary time using the ##:## form ");
enteredTime = keyboard.nextLine();
Time now = new Time (enteredTime);
System.out.println(
"Do you want to enter another (Y/N)? ");
response = keyboard.nextLine();
answer = response.charAt(0);
}
}
}
//Task2.java
import java.util.StringTokenizer;
import java.util.Scanner;
import java.io.File;
public class Task2{
public static void main(String args[])
{
String content="";
try {
content = new Scanner(new File("secret.txt")).useDelimiter("\\Z").next();
}
catch(Exception e)
{System.out.println("Cannot find file"); }
StringTokenizer st =new StringTokenizer(content);
StringBuffer sBuffer = new StringBuffer();
int i=4;
while(st.hasMoreTokens() )
{
String t = st.nextToken();
i++;
if( i==5)
{
sBuffer.append(Character.toUpperCase(t.charAt(0)));
i=0;
}
}
System.out.println("Secret is: "+sBuffer);
}
}
public class Time
{
/**hours in conventional time*/
private int hours;
/**minutes in conventional time*/
private int minutes;
/**true if afternoon time, false if morning time*/
private boolean afternoon;
/**Constructs a cutomary time (12 hours, am or pm)
from a military time ##:##
@param militaryTime in the military format ##:##*/
public Time(String militaryTime)
{
//Check to make sure something was entered
if (militaryTime == null)
{
System.out.println(
"You must enter a valid military time." );
}
//Check to make sure there are 5 characters
else if (//CONDITION TO CHECK LENGTH OF STRING)
{
System.out.println(militaryTime +
" is not a valid military time." );
}
else
{
//Check to make sure the colon is in
//the correct spot
if (//CONDITION TO CHECK COLON POSITION)
{
System.out.println(militaryTime +
" is not a valid military time." );
}
else if (//CONDITION TO CHECK FOR DIGIT)
{
System.out.println(militaryTime +
" is not a valid military time." );
}
else if (//CONDITION TO CHECK FOR DIGIT)
{
System.out.println(militaryTime +
" is not a valid military time." );
}
else if (//CONDITION TO CHECK FOR DIGIT)
{
System.out.println(militaryTime +
" is not a valid military time." );
}
else if (//CONDITION TO CHECK FOR DIGIT)
{
System.out.println(militaryTime +
" is not a valid military time." );
}
else
{
//SEPARATE THE STRING INTO THE HOURS
//AND THE MINUTES, CONVERTING THEM TO
//INTEGERS AND STORING INTO THE
//INSTANCE VARIABLES
//validate hours and minutes are valid
//values
if(hours > 23)
{
System.out.println(militaryTime +
" is not a valid military" +
" time." );
}
else if(minutes > 59)
{
System.out.println(militaryTime +
" is not a valid military" +
" time." );
}
//convert military time to conventional
//time for afternoon times
else if (hours > 12)
{
hours = hours - 12;
afternoon = true;
System.out.println(this.toString());
}
//account for midnight
else if (hours == 0)
{
hours = 12;
System.out.println(this.toString());
}
//account for noon
else if (hours == 12)
{
afternoon = true;
System.out.println(this.toString());
}
//morning times don
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#include "Time.h"
#include <iostream>
using namespace std;
Time::Time(string time)
{
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{
cout << "You must enter a
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}
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