Enumeration Interface In Java

// Java program to test Enumeration
import java.util.Vector;
import java.util.Enumeration;

public class EnumerationClass {

    public static void main(String args[])
    {
        Enumeration months;
        Vector<String> monthNames = new Vector<>();

        monthNames.add("January");
        monthNames.add("February");
        monthNames.add("March");
        monthNames.add("April");
        monthNames.add("May");
        monthNames.add("June");
        monthNames.add("July");
        monthNames.add("August");
        monthNames.add("September");
        monthNames.add("October");
        monthNames.add("November");
        monthNames.add("December");
        months = monthNames.elements();

        while (months.hasMoreElements()) {
            System.out.println(months.nextElement());
        }
    }
}

import java.io.*;
import java.util.*;
class GFG {
    public static void main(String args[])
        throws IOException
    {
        // creating the FileInputStream objects for all the
        // files
        FileInputStream fin
            = new FileInputStream("file1.txt");
        FileInputStream fin2
            = new FileInputStream("file2.txt");
        FileInputStream fin3
            = new FileInputStream("file3.txt");
        FileInputStream fin4
            = new FileInputStream("file4.txt");
        // creating Vector object to all the stream
        Vector v = new Vector();
        v.add(fin);
        v.add(fin2);
        v.add(fin3);
        v.add(fin4);

        // creating enumeration object by calling the
        // elements method
        Enumeration e = v.elements();

        // passing the enumeration object in the constructor
        SequenceInputStream bin
            = new SequenceInputStream(e);
        int i = 0;
        while ((i = bin.read()) != -1) {
            System.out.print((char)i);
        }
        bin.close();
        fin.close();
        fin2.close();
    }
}

import java.util.Enumeration;
import java.lang.reflect.Array;

public class EnumerationClass implements Enumeration {
    private int size;
    private int cursor;
    private final Object array;
    public EnumerationClass(Object obj)
    {
        Class type = obj.getClass();
        if (!type.isArray()) {
            throw new IllegalArgumentException(
                "Invalid type: " + type);
        }
        size = Array.getLength(obj);
        array = obj;
    }
    public boolean hasMoreElements()
    {
        return (cursor < size);
    }
    public object nextElements()
    {
        return Array.get(array, cursor++);
    }
}

import java.util.*;
import java.io.*;

public class EnumerationExample {
    public static void main(String args[])
    {
        // String Array Creation
        String str[] = { "apple", "facebook", "google" };

        // Array Enumeration Creation
        ArrayEnumeration aenum = new ArrayEnumeration(str);

        // usageof array enumeration
        while (aenum.hasMoreElements()) {
            System.out.println(aenum.nextElement());
        }
    }
}