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completed wave 2 #12

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completed wave 2 #12

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53 changes: 48 additions & 5 deletions src/Tallyer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.HashMap;

/**
* The Tallyer class provides functionality for reading ID and topic pairs from user input,
Expand Down Expand Up @@ -34,11 +35,13 @@ public static void main(String[] args) {
Map<String, Integer> topicCounts = tallyTopics(topics);
System.out.println("Here are how many times each topic appears (unfiltered):");
System.out.println(topicCounts);
System.out.println("test");

// Wave 2
Map<String, Integer> topicCountsFiltered = tallyTopicsFiltered(ids, topics);
System.out.println("Here are how many times each topic appears (filtered):");
System.out.println(topicCountsFiltered);

}

/**
Expand All @@ -52,12 +55,17 @@ public static void main(String[] args) {
*/
public static Map<String, Integer> tallyTopics(List<String> topics) {
// WAVE 1
// TODO: Remove the print statements and implement this method
Map<String, Integer> topicsCountMap = new HashMap<>();

for (String topic : topics) {
System.out.println("The topic is: " + topic);
if(!topicsCountMap.containsKey(topic)){
topicsCountMap.put(topic, 1);
} else {
topicsCountMap.put(topic, topicsCountMap.get(topic) + 1);
}
}

return null;
return topicsCountMap;
}

/**
Expand All @@ -72,8 +80,43 @@ public static Map<String, Integer> tallyTopics(List<String> topics) {
*/
public static Map<String, Integer> tallyTopicsFiltered(List<String> ids, List<String> topics) {
// WAVE 2
// TODO: Implement this method

return null;
// list for valid topics
List<String> validTopics = new ArrayList<>();
// map of topic count
Map<String, Integer> topicsCountMap = new HashMap<>();

// count ids
Map<String, Integer> idsCountMap = new HashMap<>();
for (String id : ids){
if(!idsCountMap.containsKey(id)){
idsCountMap.put(id, 1);
}
else {
idsCountMap.put(id, idsCountMap.get(id) + 1);
}
}

// create list of valid topics
for (int i = 0; i < ids.size(); i++) {
if(idsCountMap.get(ids.get(i)) == 2){
validTopics.add(topics.get(i));
}
}

// count topics

for (String topic : validTopics) {
if(!topicsCountMap.containsKey(topic)){
topicsCountMap.put(topic, 1);
}
else {
topicsCountMap.put(topic, topicsCountMap.get(topic) + 1);
}



}
return topicsCountMap;
}
}