Implement PriorityQueue through Comparator in Java

In Java, a PriorityQueue orders elements based on priority rather than insertion order. By using a Comparator, we can define custom ordering logic, override natural ordering, and prioritize elements or objects based on specific requirements.

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Explanation

• A Comparator is used to reverse the natural ordering.
• Higher values get higher priority.
• poll() removes elements based on the defined priority.

Syntax

PriorityQueue<Type> pq = new PriorityQueue<>(Comparator);

• Parameters: "comparator" defines custom order; if null, natural order is used

Example : PriorityQueue of Objects Using Comparator

Riya 92
Aman 85
Karan 78

Explanation

• The Comparator prioritizes students based on marks.
• Students with higher marks are removed first.

Related Topics

• Java Collections Framework
• Sorting in Java