컬렉션

import java.util.Vector;
public class CollectionEX {
	public static void main(String[] args) {
		Vector<Integer> v = new Vector<Integer>();
		v.add(5);
		v.add(4);
		v.add(-1);
		v.add(2,100);
		
		System.out.println("object element number in Vector : "+v.size());
		System.out.println("capacity of Vector : "+v.capacity());
		
		for(int i =0; i<v.size();i++) {
			int n = v.get(i);
			System.out.println(n);
		}
		int sum =0;
		for(int i=0;i<v.size();i++) {
			int n = v.elementAt(i);
			sum+=n;
		}
		System.out.println("sum of integer in Vector : "+sum);
	}
}

 

 

import java.util.*;
public class IteratorEx {
	public static void main(String[] args) {
		Vector<Integer> v = new Vector<Integer>();
		v.add(5);
		v.add(4);
		v.add(-1);
		v.add(2,100);
		
		Iterator<Integer> it = v.iterator();
		while(it.hasNext()) {
			int n = it.next();
			System.out.println(n);
		}
		
		int sum=0;
		it=v.iterator();
		while(it.hasNext()) {
			int n = it.next();
			sum+=n;
		}
		System.out.println("sum of integer in Vector : "+ sum);
	}
}