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Start your free trialChris Gauthier
Courses Plus Student 6,434 PointsHash Map Question 4
Oops, apparantly I forgot my code last time i posted this. I assumed the challenge checker would attach it automatically. Here it is.
package com.example;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class BlogPost implements Comparable<BlogPost>, Serializable {
private String mAuthor;
private String mTitle;
private String mBody;
private String mCategory;
private Date mCreationDate;
public BlogPost(String author, String title, String body, String category, Date creationDate) {
mAuthor = author;
mTitle = title;
mBody = body;
mCategory = category;
mCreationDate = creationDate;
}
public int compareTo(BlogPost other) {
if (equals(other)) {
return 0;
}
return mCreationDate.compareTo(other.mCreationDate);
}
public String[] getWords() {
return mBody.split("\\s+");
}
public List<String> getExternalLinks() {
List<String> links = new ArrayList<String>();
for (String word : getWords()) {
if (word.startsWith("http")) {
links.add(word);
}
}
return links;
}
public String getAuthor() {
return mAuthor;
}
public String getTitle() {
return mTitle;
}
public String getBody() {
return mBody;
}
public String getCategory() {
return mCategory;
}
public Date getCreationDate() {
return mCreationDate;
}
}
package com.example;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.HashMap;
public class Blog {
List<BlogPost> mPosts;
public Blog(List<BlogPost> posts) {
mPosts = posts;
}
public List<BlogPost> getPosts() {
return mPosts;
}
public HashMap<String,Integer> getCategoryCounts() {
Map<String><Integer> hashCounts = new HashMap<>();
Integer count;
for (BlogPost post : mPosts) {
String author = post.getAuthor();
if (hashCounts.get(author) == null) {
count = 0;
}
else {
count++;
}
}
hashCounts.put(author,count);
return hashCounts;
}
1 Answer
Steven Parker
231,184 PointsYou could have just pasted your code into the previous question. I suppose you could just delete it now.
Someone posted a question about this exercise last month and received a thoroughly commented solution in an answer. Take a look at that one and see if it helps.