Table of Contents
- 1 What is the difference between a comparable and a Comparator?
- 2 What is Comparator interface Java?
- 3 Why do we need comparable interface in Java?
- 4 Why Comparable and Comparator interfaces are needed?
- 5 What is comparable and comparator interface?
- 6 What is difference between comparable and comparator?
- 7 How to use comparator in Java?
What is the difference between a comparable and a Comparator?
1) Comparable provides a single sorting sequence. In other words, we can sort the collection on the basis of a single element such as id, name, and price. The Comparator provides multiple sorting sequences. In other words, we can sort the collection on the basis of multiple elements such as id, name, and price etc.
Are comparable and Comparator functional interface in Java?
We said that Comparator is a functional interface because it has a single abstract method. Comparable is also a functional interface since it also has a single abstract method.
What is Comparator interface Java?
Method 2: Using comparator interface- Comparator interface is used to order the objects of a user-defined class. This interface is present in java. util package and contains 2 methods compare(Object obj1, Object obj2) and equals(Object element). Using a comparator, we can sort the elements based on data members.
What is the difference between comparable interface and Comparator interface?
Comparable and comparator both are an interface that can be used to sort the elements of the collection. Comparator interface sort collection using two objects provided to it, whereas comparable interface compares” this” refers to the one objects provided to it.
Why do we need comparable interface in Java?
Java Comparable interface is used to order the objects of the user-defined class. This interface is found in java. lang package and contains only one method named compareTo(Object). It provides a single sorting sequence only, i.e., you can sort the elements on the basis of single data member only.
How do we use Comparator and comparable interfaces?
Whereas, Comparator interface sorting is done through a separate class. Logically, Comparable interface compares “this” reference with the object specified and Comparator in Java compares two different class objects provided.
Why Comparable and Comparator interfaces are needed?
To summarize, if sorting of objects needs to be based on natural order then use Comparable whereas if you sorting needs to be done on attributes of different objects, then use Comparator in Java.
Does the comparable interface contain which called?
Answer: Java Comparable interface is used to order the objects of the user-defined class. This interface is found in java. lang package and contains only one method named Compare To (Object).
What is comparable and comparator interface?
Why do we need comparator and comparable in Java?
Comparable should be used when you compare instances of the same class. Comparator can be used to compare instances of different classes. Comparable is implemented by the class which needs to define a natural ordering for its objects. For example, String implements Comparable.
What is difference between comparable and comparator?
Key Differences Between Comparable and Comparator. The Comparable interface lies inside java.lang package whereas, the Comparator interface lies inside the java.util package. The Comparable interface declares only one method that is compareTo(Object obj) whereas, the Comparator interface declares two methods that are, compare(Object obj1,…
What is the difference between comparison and contrast?
Contrast means to examine the character or qualities of something in order to discover the differences. Therefore, the main difference between compare and contrast is that compare looks at both similarities and differences whereas contrast only looks at the differences.
How to use comparator in Java?
Open your text editor and type in the following Java statements: Notice that the class implements Comparable.
What is comparator in Java?
Java Comparator. Java Comparator is an interface for sorting Java objects. Invoked by “java.util.comparator,” Java Comparator compares two Java objects in a “compare(Object 01, Object 02)” format. Using configurable methods, Java Comparator can compare objects to return an integer based on a positive, equal or negative comparison.