Intro to Java using Eclipse Question.java package edu.unca.csci201; public interface Question { /** * Returns the tex

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Intro to Java using Eclipse
Question.java
package edu.unca.csci201;
public interface Question {
/**
* Returns the text of the question for display to the
user
*/
public String getTextPrompt();

/**
* Returns an array of all the possible answers a user
may resond
* to this question with. If this question does not
provide a list
* of possible answers, this method throws an
exception
*/
public Answer [] getPossibleAnswers() throws
NoAnswersException;

/**
* Returns the true answer to this question. If this
question
* does not have a single true answer, this method
throws an
* exception
*/
public Answer getCorrectAnswer() throws
NoCorrectAnswerException;

/**
* Given a string entered by the user, this method
returns
* an appropriate answer object that represents the
user's
* response. If no such answer object can be created
due to
* the user's response being invalid, this method
throws an
* exception
*/
public Answer convertResponseToAnswer(String
userResponse) throws InvalidResponseException;

}
Answer.java
package edu.unca.csci201;
public interface Answer {
/**
* Returns a String that represents this Answer,
* formatted for the user
*/
public String toString();

/**
* Returns true if the other may be considered the same
answer
* as this one.
*/
public boolean isSameAs(Answer other);

}
QuizTime.java
package edu.unca.csci201;*/
import java.text.DecimalFormat;
import java.util.Scanner;
public class QuizTime {
public static void main(String[] args) {
Quiz thequiz=new Quiz();
/*MultipleChoiceQuestion test1=new MultipleChoiceQuestion("This
is a test question? (ans='A')","A","A","B",
"C","D");
FillinTheBlankQuestion test2=new FillinTheBlankQuestion("This is
another test question? (Answer is 'hello')",
"hello");
*/
Question[] quiz1=new Question[25];
quiz1[0]=new MultipleChoiceQuestion("What is Germany's 1# export
for 2019?","B","A. Automobiles",
"B. Machinery","C. Beer","D. Electronics");
quiz1[1]=new FillinTheBlankQuestion("______ has the largest
train station in Europe.", "Berlin");
quiz1[2]=new TrueFalseQuestion("True or False: The first printed
book was in German.", true);
quiz1[3]=new MultipleChoiceQuestion("Most taxis in Germany are:
", "C","A. BMW","B. Audi","C. Mercedes",
"D. Ford");
quiz1[4]=new FillinTheBlankQuestion("_______ is the largest
state in Germany","Bavaria");
quiz1[5]=new TrueFalseQuestion("True or false: McDonald’s in
Germany serves beer.", true);
quiz1[6]=new MultipleChoiceQuestion("Which of the following
cities was never the capital of Germany?" , "C",
"A. Aachen", "B. Trier","C. Düsseldorf" ,"D. Cologne");
quiz1[7]=new FillinTheBlankQuestion("Radioactive _____ (answer
ends in an s) roam wild in Germany.", "boars");
quiz1[8]=new TrueFalseQuestion("True or false: Prison escape is
not punishable by law in Germany", true);
quiz1[9]=new MultipleChoiceQuestion("What percentage of the
Autobahn doesn't have a speed limit?",
"D", "A. 50%", "B. 85%", "C. 25%", "D. 65%");
quiz1[10]=new FillinTheBlankQuestion("In what month does
Oktoberfest begin?", "September");
quiz1[11]=new TrueFalseQuestion("True or false: Germany is the
largest exporter of cars in the world.",
false);
try {
for(Question q : quiz1)
{
if(q==null) {break;}
thequiz.addQuestion(q);
}
} catch (QuizFullException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//thequiz.printQuiz();
System.out.println("Welcome to a small quiz
on Germany!");

System.out.println("For multiple choice
questions only answer with the corresponding letter to the correct
answer.");

System.out.println("For all fill in the blank
questions the answer is just 1 word.");

System.out.println("for True/False questions
answer with the word 'true' or 'false' ");


System.out.println("-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-");
double score=thequiz.giveQuiz();
DecimalFormat df=new
DecimalFormat("0.00");

System.out.println("Your score was:
"+df.format(score)+" out of 100");

System.out.println("Enter 'OK' to continue to
missed answers..");

Scanner scan2=new Scanner(System.in);

scan2.next();

thequiz.printwrongs();

scan2.close();
}
}
TrueFalseQuestion.java
package edu.unca.csci201;
public class TrueFalseQuestion implements Question {
private String question="";
private Boolean answer;
public TrueFalseQuestion(String string, boolean b) {
this.question=string;
this.answer=b;
}
@Override
public String getTextPrompt() {
return this.question;
}
@Override
public Answer[] getPossibleAnswers() throws NoAnswersException
{
Answer[] a=null;//= {new
TrueFalseAnswer(true), new TrueFalseAnswer(false)};
if(a==null)throw new NoAnswersException();
return a;
}
@Override
public Answer getCorrectAnswer() throws NoCorrectAnswerException
{
Answer a=new
TrueFalseAnswer(this.answer);
return a;
}
@Override
public Answer convertResponseToAnswer(String userResponse)
throws InvalidResponseException {
String
converted=userResponse.toUpperCase();
Boolean answ = null;
if(converted.equalsIgnoreCase("t")||converted.equalsIgnoreCase("true"))answ=true;
else
if(converted.equalsIgnoreCase("f")||converted.equalsIgnoreCase("false"))answ=false;
else {throw new
InvalidResponseException();}
Answer b=new TrueFalseAnswer(answ);
return b;
}
}