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Start your free trialSean Flanagan
33,235 PointsUpgrade Comparable to Use Generics
Hi. I've tried this one but I'm stuck. Thanks in advance for any help. :-)
package com.example;
import java.io.Serializable;
import java.util.Date;
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 obj) {
BlogPost other = (BlogPost) obj;
if (equals(other)) {
return 0;
}
return mCreationDate.compareTo(BlogPost.mCreationDate);
}
public String[] getWords() {
return mBody.split("[^\\w']+");
}
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;
}
}
1 Answer
Enrique Munguía
14,311 PointsYour code must compare the this instance and the instance received in compareTo method. You don't have to cast obj to BlogPost because it is already a BlogPost. The code may look like this:
public int compareTo(BlogPost obj) {
if (this.equals(obj)) {
return 0;
}
return this.mCreationDate.compareTo(obj.mCreationDate);
}
Sean Flanagan
33,235 PointsSean Flanagan
33,235 PointsHi. I tried your code and it worked. Thanks. :-)