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Start your free trialJohannes Pedersen
1,006 Pointsnon-static method getAuthor() cannot be referenced from a static context
I keep getting this error, can anyone help me out please?
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.TreeSet;
import java.util.Set;
public class Blog {
List<BlogPost> mPosts;
public Blog(List<BlogPost> posts) {
mPosts = posts;
}
public List<BlogPost> getPosts() {
return mPosts;
}
public Set<String> getAllAuthors(){
Set<String> allAuthors = new TreeSet<>();
for(BlogPost author : getPosts()){
allAuthors.add(BlogPost.getAuthor());
}
return allAuthors;
}
}
1 Answer
andren
28,558 PointsThe issue is that you try to call the getAuthor
method directly from the BlogPost
class, rather than calling it from author
which is the variable that holds the BlogPost
objects that the for
loop is pulling out.
If you change BlogPost.getAuthor()
to author.getAuthor()
like this:
public Set<String> getAllAuthors(){
Set<String> allAuthors = new TreeSet<>();
for(BlogPost author : getPosts()){
allAuthors.add(author.getAuthor());
}
return allAuthors;
}
Then your code will work.