Java Enum Alongside Constructor Example

Java Enum amongst Constructor

Many Java developers don't know that Java Enum tin receive got a constructor to transcend information spell creating Enum constants. This characteristic allows you lot to associate related information together. One illustration of passing arguments to enum Constructor is our TrafficLight Enum where nosotros transcend activeness to each Enum illustration e.g. GREEN is associate amongst go, RED is associated amongst stop in addition to ORANGE is associated amongst the slow down. This is actually useful because it provides to a greater extent than context in addition to pregnant to your code. If you lot want, you lot tin likewise render 1 or to a greater extent than constructor to your Enum every bit it likewise supports constructor overloading like normal Java classes. This is real unlike from enum you lot receive got seen inward C or C++, which is only a collection of fixed affair without whatsoever OOP power.

Just recall that constructor inward enums an exclusively endure either somebody or bundle marking it can't endure world or protected so access modifier public in addition to protected are non allowed to Enum constructor, it volition consequence inward compile fourth dimension error.

By the way, this is non our offset tutorial on Java Enum where nosotros receive got explained a fundamental feature, nosotros receive got likewise ready covered approximately of import features on Enum inward our previous examples similar Java Enum Switch Example explains that you lot tin purpose enum constants within switch block.

Similarly, Java Enum valueOf Example and Enum to String Example inward explains that how you lot tin acquire the String representation of Enum. These curt tutorials are a practiced agency to larn approximately useful features of enum inward Java.

Java Enum amongst Constructor Example

String declaration which is saved to activeness land which is afterwards accessed past times getter method getAction().

As I explained, nosotros receive got an Enum TrafficSignal, which receive got iii enum constants, RET, GREEN, in addition to ORANGE, in addition to nosotros receive got associated, wait, croak in addition to tedious downward amongst them past times passing values into the constructor.

/**
 * Java enum amongst constructor for example.
 * Constructor bring 1 String declaration action
 */
public enum TrafficSignal{
    //this volition telephone outcry upward enum constructor amongst 1 String argument
    RED("wait"), GREEN("go"), ORANGE("slow down");
 
    private String action;
 
    public String getAction(){
        return this.action;
    }
 
    // enum constructor - tin non endure world or protected
    TrafficSignal(String action){
        this.action = action;
    }
}

/**
 *
 * Java Enum illustration amongst constructor.
 * Java Enum tin receive got constructor but it tin not
 * endure world or protected
 *
 * @author http://java67.com
 */
public class EnumConstructorExample{

    public static void main(String args[]) {
     
      //let's impress advert of each enum in addition to in that place action
      // - Enum values() examples
      TrafficSignal[] signals = TrafficSignal.values();
   
      for(TrafficSignal request : signals){
          //Java advert illustration - Java getter method example
          System.out.println("name : "
                             + signal.name()
                             + " action: "
                             + signal.getAction());
      }
   
    }
 
}

This was our Java Enum illustration amongst Constructor. Now, you lot know that Enum tin have a constructor inward Java which tin endure used to transcend information to Enum constants, only similar nosotros passed activeness here. Though Enum constructor cannot endure protected or public, it tin either receive got somebody or default modifier only.

Further Learning
Complete Java Masterclass
In-depth Guide of Enum inward Java
10 Things Java Programmers Should Learn inward 2018
How to croak a amend Java developer

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