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1 Answer(s)      8 years ago
Posted in : Java Beginners
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September 29, 2008 at 5:32 PM


When u don.t know how much element can contain ur array, that time u choose either ArrayList or Vector Class (From Collection Class).

Vector is a growable array.

Here no need to define the intial size of ur array. Runtime it automatic increase its size if or not u declare the size

see the example given below

package rajanikant.code.sep_2008;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Vector;

public class ReadUntilZero {
private double number;
private ArrayList<Double> list = new ArrayList<Double>();

private Vector<Double> list1 = new Vector<Double>();

public void readNumber() throws NumberFormatException, IOException{
InputStreamReader isr = new InputStreamReader(;
BufferedReader br = new BufferedReader(isr);
System.out.println("Enter number until Zero : ");
number = Double.parseDouble(br.readLine());
//do your work
if(number == 0.0){
list1.add(number); //for vector
list.add(new Double(number)); //arraylist
}while(number !=0);


public static void main(String s[]){
new ReadUntilZero().readNumber();
}catch(Exception e){
System.out.println("IOException Occurs");




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