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Constructor overloading in enumerations in Java.
Overloading is a one of the mechanisms to achieve polymorphism where, a class contains two methods with same name and different parameters.
Whenever you call this method the method body will be bound with the method call based on the parameters.
Constructor overloading
Similar to methods you can also overload constructors i.e. you can write more than constructor with different parameters.
And, based on the parameters we pass at the time of instantiation, respective constructor will be invoked.
Example
public class Sample{
public Sample(){
System.out.println("Hello how are you");
}
public Sample(String data){
System.out.println(data);
}
public static void main(String args[]){
Sample obj = new Sample("Tutorialspoint");
}
}Output
Tutorialspoint
Constructor overloading in enum
Just like normal constructors you can also override the constructors of an enum. i.e. you can have the constructor with different parameters.
Example
Following Java program demonstrates the constructor overloading in enumerations.
import java.util.Arrays;
enum Student {
Krishna("Krishna", "kasyap", "Bhagavatula"), Ravi("Ravi", "Kumar", "pyda"), Archana("Archana", "devraj", "mohonthy");
private String firstName;
private String lastName;
private String middleName;
private Student(String firstName, String lastName,String middlename){
this.firstName = firstName;
this.lastName = lastName;
this.middleName = middleName;
}
private Student(String name) {
this(name.split(" ")[0], name.split(" ")[1], name.split(" ")[2]);
}
}
public class ConstructorOverloading{
public static void main(String args[]) {
Student stds[] = Student.values();
System.out.println(Arrays.toString(stds));
}
}Output
[Krishna, Ravi, Archana]
Updated on: 02-Jul-2020
655 Views
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