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Start your free trialFerin Patel
6,832 PointsTODO TreeStory2
I'm getting a Null Pointer Exception error in Prompter Class line 81.. I double checked my code in IDE; it works perfectly fine as intended but I get an error on this site editor ????? Plz help m stuck at this
package com.teamtreehouse;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main {
public static void main(String[] args) {
// write your code here
Prompter prompter = new Prompter();
String userInputStory = "";
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.printf("Enter your story in __format__ : ");
try {
userInputStory = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
Template tmpl = new Template(userInputStory);
prompter.run(tmpl);
}
}
package com.teamtreehouse;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class Prompter {
private BufferedReader mReader;
private Set<String> mCensoredWords;
public Prompter() {
mReader = new BufferedReader(new InputStreamReader(System.in));
loadCensoredWords();
}
private void loadCensoredWords() {
mCensoredWords = new HashSet<String>();
Path file = Paths.get("resources", "censored_words.txt");
List<String> words = null;
try {
words = Files.readAllLines(file);
} catch (IOException e) {
System.out.println("Couldn't load censored words");
e.printStackTrace();
}
mCensoredWords.addAll(words);
}
public void run(Template tmpl) {
List<String> results = null;
try {
results = promptForWords(tmpl);
} catch (IOException e) {
System.out.println("There was a problem prompting for words");
e.printStackTrace();
System.exit(0);
}
System.out.println(tmpl.render(results));
}
/**
* Prompts user for each of the blanks
*
* @param tmpl The compiled template
* @return
* @throws IOException
*/
public List<String> promptForWords(Template tmpl) throws IOException {
List<String> words = new ArrayList<String>();
for (String phrase : tmpl.getPlaceHolders()) {
String word = promptForWord(phrase);
words.add(word);
}
return words;
}
/**
* Prompts the user for the answer to the fill in the blank. Value is guaranteed to be not in the censored words list.
*
* @param phrase The word that the user should be prompted. eg: adjective, proper noun, name
* @return What the user responded
*/
public String promptForWord(String phrase) {
String answers = " ";
boolean flag;
do {
System.out.printf("Enter your %s: ", phrase);
flag = true;
try {
answers = mReader.readLine();
for(String checkWords: mCensoredWords) {
if (answers.equals(checkWords)) {
System.out.printf("Please enter appropiate words..Try again %n");
flag = false;
}
}
} catch (IOException e) {
e.printStackTrace();
}
}while(!flag);
return answers;
}
}
# This is essentially what I am testing
1. The user is prompted for a new string template (the one with the double underscores in it).
a. The prompter class has a new method that prompts for the story template, and that method is called.
2. The user is then prompted for each word that has been double underscored.
a. The answer is checked to see if it is contained in the censored words.
User is continually prompted until they enter a valid word
3. The user is presented with the completed story
1 Answer
Cindy Lea
Courses Plus Student 6,497 Pointsmain. java:
package com.teamtreehouse;
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader;
public class Main {
public static void main(String[] args) {
BufferedReader mReader = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Make a story with the following variables name, noun and adjective! Write a fill in the blank story with an underscore on each side of the variable like __noun__ or __adjective__ or __etc__");
Prompter prompter = new Prompter();
String story = null;
try {
story = prompter.promptForStory();
} catch (IOException e) {
e.printStackTrace();
}
Template tmpl = new Template(story);
prompter.run(tmpl);
}
} prompter.java :
package com.teamtreehouse;
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set;
public class Prompter { private BufferedReader mReader; private Set<String> mCensoredWords;
public Prompter() {
mReader = new BufferedReader(new InputStreamReader(System.in));
loadCensoredWords();
}
private void loadCensoredWords() {
mCensoredWords = new HashSet<>();
Path file = Paths.get("resources", "censored_words.txt");
List<String> words = null;
try {
words = Files.readAllLines(file);
} catch (IOException e) {
System.out.println("Couldn't load censored words");
e.printStackTrace();
}
mCensoredWords.addAll(words);
}
public void run(Template tmpl) {
List<String> results = null;
try {
results = promptForWords(tmpl);
} catch (IOException e) {
System.out.println("There was a problem prompting for words");
e.printStackTrace();
System.exit(0);
}
System.out.println(tmpl.render(results));
}
public List<String> promptForWords(Template tmpl) throws IOException {
List<String> words = new ArrayList<String>();
for (String phrase : tmpl.getPlaceHolders()) {
String word = promptForWord(phrase);
words.add(word);
}
return words;
}
public String promptForStory() throws IOException {
return mReader.readLine();
}
public String promptForWord(String phrase) throws IOException {
System.out.printf("Please Enter your words for %s:: %n", phrase);
String answer = mReader.readLine();
while (mCensoredWords.contains(answer)) {
System.out.printf("Sorry %s is an unacceptable word%n", phrase);
answer = mReader.readLine();
}
return answer.trim();
}
}