enum examples

usging enum to declare elements:
================================
public enum Elements
{
    Fire, Water, Air, Earth;
}

creating instances of enums:
============================
public enum Instances
 {
    //One instantiated with empty constructor (enum are Great)
    One,
    //Two instantiated with overloaded constructor with String parameter(Zeev)
    Two("Zeev");
    //enum can store use properties
    private String text;
    //enum can use private constructor
    private Instances(){
        this.text="enum are Great";
    }
    //enum can use overloading...
    private Instances(String text)
{
        this.text=text;
    }
    //enum can use methods
    public String getText()
    {
        return this.text;
    }
    public void setText(String text)
    {
        this.text=text;
    }

}

using interface with enum
==========================
public interface Thirdable
{
    public void printIt(String it);
}

//forcing Third enum to implement specific interface
public enum Third implements Thirdable
{
    zeev;//Third instance

    //Default constructor use inherited .printIt() method
    private Third() {
        this.printIt("created");
    }
    @Override
    public void printIt(String it)
    {
        System.out.println("Third prints: "+it);
    }
}



using the enum (tester)
======================
public class Testerit
{
    public static void main(String[] args) {

        Elements elem;
            elem = Elements.Fire;
            System.out.println(elem==Elements.Water);//
            System.out.println(elem==Elements.Fire);//
            //
        switch (elem){
            case Fire:
                System.out.println("Taase A");
            break;
            case Water:
                System.out.println("Taase B");
            break;
            case Earth:
            case Air:
                System.out.println("Taase C");
        }

        //possible -> elem it's local variable of Elements type
        elem = Elements.Air;
        //impossible -> elem.Air is constant which cannot be changed
        //elem.Air=Elements.Fire;

        // .values() method -> returns Array of enum instances
        Elements [] elems=Elements.values();
        //change elem variable to first element
        elem=elems[0];
        // .name() method -> returns String representation for enum's instance Name
        String elemName=elem.name();
        System.out.println("we got "+elemName);


        Instances inst = Instances.One;
        System.out.println(inst.getText());
        inst.setText("I am Groot");
        System.out.println(inst.getText());

        System.out.println(Instances.Two.getText());

        inst = null;

        System.out.println("here:"+Instances.One.values()[1].values()[0].getText());
        Third.zeev.printIt("Enum is Awesome");

    }

}