Java PriorityQueue Example
Published:
class Book implements Comparable{
int id;
String name,author,publisher;
int quantity;
public Book(int id, String name, String author, String publisher, int quantity) {
this.id = id;
this.name = name;
this.author = author;
this.publisher = publisher;
this.quantity = quantity;
}
public int compareTo(Book b) {
if(id>b.id){
return 1;
}else if(id queue = new PriorityQueue();
//Creating Books
Book b1 = new Book(121, "Let us C", "Yashwant Kanetkar", "BPB", 8);
Book b2 = new Book(233, "Operating System", "Galvin", "Wiley", 6);
Book b3 = new Book(101, "Data Communications & Networking", "Forouzan", "Mc Graw Hill", 4);
Book b4 = new Book(121, "Operating System 2", "Galvin", "Wiley", 6);
//Adding Books to the queue
queue.add(b1);
queue.add(b2);
queue.add(b3);
queue.add(b4);
System.out.println("Traversing the queue elements:");
//Traversing queue elements
for (Book b : queue) {
System.out.println(b.id + " " + b.name + " " + b.author + " " + b.publisher + " " + b.quantity);
}
queue.remove();
System.out.println("After removing one book record:");
for (Book b : queue) {
System.out.println(b.id + " " + b.name + " " + b.author + " " + b.publisher + " " + b.quantity);
}
}
}
--Output
Traversing the queue elements:
101 Data Communications & Networking Forouzan Mc Graw Hill 4
121 Operating System 2 Galvin Wiley 6
121 Let us C Yashwant Kanetkar BPB 8
233 Operating System Galvin Wiley 6
After removing one book record:
121 Operating System 2 Galvin Wiley 6
233 Operating System Galvin Wiley 6
121 Let us C Yashwant Kanetkar BPB 8