public void iteratordemo(){ArrayList<String> a = new ArrayList<String>(Arrays.asList("dog","cat","pig","fish"));Iterator<String> i = a.iterator();while(i.hasNext()){System.out.print(i.next()+" ");}System.out.println("");//foreachfor(String s:a){System.out.print(s+" ");}
}

ArrayList<String> a = new ArrayList<String>(Arrays.asList("a","b","c"));
LinkedList<Integer> l = new LinkedList<Integer>(Arrays.asList(1,2,3));
HashSet<Double> s = new HashSet<Double>();
public void iteratordisplay(Iterator<String> s){while(s.hasNext()){System.out.print(s.next()+" ");}System.out.println();
}
iteratordisplay(a.iterator());
iteratordisplay(l.iterator());
iteratordisplay(s.iterator());

//Constructor methods
Vector<String> v = new Vector<String>();
Vector<String> v1 = new Vector<String>(Arrays.asList("q","w"));
Vector<Integer> v2 = new Vector<Integer>(9);
//Vector(initialcapacity,capacityincrement)
Vector<Double> v3 = new Vector<Double>(5,5);//new methods
v.addElement("a");
int i = v.capacity();Object[] s = new String[100];
v.copyInto(s);
v.elementAt(1);
v.insertElementAt("b",2);
v.removeElement("a");
v.removeElementAt(2);
v.removeRange(2,4);
v.setElementAt("c",3);

package net.mindview.util;import java.util.LinkedList;public class Stack<T>{private LinkedList<T> storage = new LinkedList<T>();public void push(T v){storage.addFirst(v); }public T peek(){return storage.getFirst();}public T pop(){return storage.removeFirst();}public boolean empty(){return storage.isEmpty();}public String toString(){return storage.toString();}
}

//import package mentioned aboveimport net.mindview.util.Stack;public class Stacktest{public static void main(String[] args){Stack<String> stack = new Stack<String>();for(String s: "I love you".split(" "))stack.push(s);while(!stack.empty())System.out.println(stack.pop() + " ");}//output: you love I
}