Differbetween
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. ...
- What is the main difference between comparable and comparator?
- What is difference between compare and compareTo in Java?
- Which is better comparator or comparable in Java?
- What are comparators in Java?
- What is the need of comparator?
- What is the advantage of generic collection in Java?
- Why is string immutable in Java?
- What is immutable class in Java?
- What is anonymous class in Java?
- What does the hashCode () method?
- What does compareTo return in Java?
- Why do we use comparable in Java?
What is the main difference between comparable and comparator?
Difference between Comparable vs Comparator in Java
| Comparable | Comparator |
|---|---|
| The class whose objects you want to sort must implement comparable interface. | Class, whose objects you want to sort, do not need to implement a comparator interface. |
| It provides single sorting sequences. | It provides multiple sorting sequences. |
What is difference between compare and compareTo in Java?
compareTo() is called on one object, to compare it to another object. compare() is called on some object to compare two other objects. The difference is where the logic that does actual comparison is defined.
Which is better comparator or 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.
What are comparators in Java?
Java Comparator interface. Java Comparator interface is used to order the objects of a user-defined class. This interface is found in java. util package and contains 2 methods compare(Object obj1,Object obj2) and equals(Object element).
What is the need of comparator?
Comparators are used to find-out deviation of dimensions between a given component being checked and a known datum. The indicated difference in the dimensions is usually small and hence suitable magnification device should be employed to obtain the desired accuracy of measurements.
What is the advantage of generic collection in Java?
Code that uses generics has many benefits over non-generic code: Stronger type checks at compile time. A Java compiler applies strong type checking to generic code and issues errors if the code violates type safety. Fixing compile-time errors is easier than fixing runtime errors, which can be difficult to find.
Why is string immutable in Java?
The string is Immutable in Java because String objects are cached in the String pool. ... Mutable String would produce two different hashcodes at the time of insertion and retrieval if contents of String was modified after insertion, potentially losing the value object in the map.
What is immutable class in Java?
Immutable class means that once an object is created, we cannot change its content. In Java, all the wrapper classes (like Integer, Boolean, Byte, Short) and String class is immutable. ... The class must be declared as final (So that child classes can't be created)
What is anonymous class in Java?
In Java, a class can contain another class known as nested class. It's possible to create a nested class without giving any name. A nested class that doesn't have any name is known as an anonymous class. An anonymous class must be defined inside another class. Hence, it is also known as an anonymous inner class.
What does the hashCode () method?
The hashCode method is an inbuilt method that returns the integer hashed value of the input value. ... If two or more objects are equal according to the equals method, then their hashes should be equal too. If two or more objects are not equal according to the equals method, then their hashes can be equal or unequal.
What does compareTo return in Java?
Java String compareTo() Method
The method returns 0 if the string is equal to the other string. A value less than 0 is returned if the string is less than the other string (less characters) and a value greater than 0 if the string is greater than the other string (more characters).
Why do we use comparable 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.
