Write a java program to sort books in ascending order based on their title using Comparator

 import java.util.*;

class Book

{

int id;

String title;

Book(int id, String title)

{

this.id=id;

this.title=title;

}

public String toString()

{

return id+" "+title;

}

}

public class BookDemo

{

public static void main(String args[])

{

List<Book> ar= new ArrayList<Book>();

        ar.add(new Book(1,"java"));

ar.add(new Book(2,"C"));

Comparator<Book> com = new Comparator<Book>()

{

public int compare(Book ob1, Book ob2)

{

if(ob1.title.compareTo(ob2.title)>0)

return 1;

else

return -1;

}

};

Collections.sort(ar,com);

for(Book b:ar)

System.out.println(b);

}

}

==========================================================

import java.util.*;

class Book implements Comparable<Book>

{

int id;

String title;

Book(int id, String title)

{

this.id=id;

this.title=title;

}

public String toString()

{

return id+" "+title;

}

public int compareTo(Book ob2)

{

if(this.title.compareTo(ob2.title)>0)

return 1;

else

return -1;

}

}

public class BookDemo

{

public static void main(String args[])

{

List<Book> ar= new ArrayList<Book>();

        ar.add(new Book(1,"java"));

ar.add(new Book(2,"C"));

Collections.sort(ar);

for(Book b:ar)

System.out.println(b);

}

}