Comparable vs Comparator

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Comparable vs Comparator

In Java, Comparable and Comparator are interfaces used to sort objects, but they serve different purposes and are used in different ways.

Comparable:

It is found in the java.lang package.

A class implements Comparable<T> to define its natural ordering.

It has a single method: int compareTo(T o).

You override this method to compare the current object (this) with another.

Example:

java

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public class Student implements Comparable<Student> {

    int marks;

    public int compareTo(Student s) {

        return this.marks - s.marks;

    }

}

Sorting is done using Collections.sort(list);

Comparator:

It is in the java.util package.

It is used to define custom ordering of objects, especially when the class doesn’t implement Comparable.

It has a method: int compare(T o1, T o2).

You can create multiple comparators for different sorting logic.

Example:

java

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Comparator<Student> nameComp = (a, b) -> a.name.compareTo(b.name);

Collections.sort(list, nameComp);

Key Differences:

Comparable affects the original class; Comparator doesn’t.

Comparable has only one sorting logic; Comparator allows multiple.

Use Comparable when default ordering is needed, and Comparator for flexible, custom sorting.

Conclusion:

Use Comparable for natural, default sorting and Comparator for custom sorting logic, especially when sorting the same class by different attributes.

Read More

Iterator and ListIterator

HashMap, TreeMap

HashSet, TreeSet

ArrayList, LinkedList

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