重写equals() 和 hashCode()方法

import java.util.Objects;

public class Chapter {
@Override
public int hashCode() {
// TODO Auto-generated method stub
return Objects.hash(chapterName,text,url);
}
@Override
public boolean equals(Object obj) {
// TODO Auto-generated method stub
if (obj == this) return true;
if (!(obj instanceof Chapter)) {
return false;
}
Chapter chapter = (Chapter) obj;
return Objects.equals(chapterName, chapter.chapterName)  &&
Objects.equals(text, chapter.text) &&
Objects.equals(url, chapter.url);
}
private String chapterName ;
private String text;
private String url;
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getChapterName() {
return chapterName;
}
public void setChapterName(String chapterName) {
this.chapterName = chapterName;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
}