In which class the Interface Iterator is implemented for Vector class

[Arun raghvan]

In which class the Interface Iterator is implemented for Vector class
the code is shown below: where i don't implement the interface Iterator where it is defined.

package com.Arraything;

import java.util.Iterator;
import java.util.Vector;

public class VectorOtherDataDemo4 {
	public static void main(String[] args) {
		Integer b;
		//adding disimilar elements into vector
		Vector vecAccountBalance = new Vector();
		vecAccountBalance.add("6000");
		vecAccountBalance.add(100);
Object a=(vecAccountBalance.get(1));
if(a instanceof Integer){b=(Integer)a;System.out.println("b is: "+b);}
		vecAccountBalance.add(new Double(1000.555));
		
		System.out.println("Vector : The Account Balances are "
				+ vecAccountBalance);

		
		//iterating through dissimilar elements
		Iterator itr = vecAccountBalance.iterator();
		while (itr.hasNext()) {
			Object e = (Object) itr.next();
			if (e instanceof String) {
				String str = e.toString();
				System.out.println("Value of String is :" + str);
			}
			else if (e instanceof Integer) {
				Integer i = (Integer) e;
				System.out.println("Value of String is :" + i);
			}
			else if (e instanceof Double) {
				Double dbl = (Double) e;
				System.out.println("Value of String is :" + dbl);
			}
			else{
				throw new ClassCastException("sorry boss wrong input");
			}
		}
	}

}


    

[Wouter Oet]

I really don't understand your question. The Vector class implements the Iterable interface. Is that what you mean?

[Arun raghvan]

Wouter Oet wrote: The Vector class implements the Iterable interface. Is that what you mean?

Yes ,Vector class must have implemented Iterator interface ...right ,why should it must implement Iterable...I can't understand the hierarchy is bit confusing. And On the following code i used iterator() Method where it is defined

 Iterator itr = vecAccountBalance.iterator();     

sorry,my question was bit confusing.

[Wouter Oet]

The iterator method is defined in the Iterable interface and the vector implements that interface. If you're confused with the hierarchy just look at the java.util.Vector

[Rob Spoor]

Many Collection classes have a private inner class that implements Iterator. An instance of this class is returned. But you don't need to know what the actual class is. All you need to know is that it implements Iterator, and therefore has working hasNext() and next() methods, and possibly also a working remove() method (I said possibly since it's allowed to throw a UnsupportedOperationException from it).