How to convert Vector to array inwards Java? two Examples

In the last article, nosotros lead hold learned how to convert a LinkedList to array inwards Java together with inwards today's tutorial you lot volition acquire how to convert a Vector to array inwards Java. There is a similarity betwixt Vector together with LinkedList, both implements the List interface. Even though Vector is a legacy class together with exists inwards Java from JDK 1.1 long before Java Collection framework was introduced, it was afterward retrofitted to implement the List interface. You tin flaming role the same toArray() method to convert a Vector to an array inwards Java. Similar to LinkedList, you lot tin flaming convert Vector of whatever object to an array of the corresponding object, the solely restriction is that you lot cannot convert a vector of Integers to an array of ints or Vector of Float objects to an array of floats, which applies to our linked list solution equally well.

For a Java developer, a goodness noesis of dissimilar Collection classes are rattling of import because that volition enable you lot to chose the correct Collection flat for the job. For example, if you lot know that Vector implements List interface together with hence you lot know that it is an ordered collection together with when you lot convert Vector to array the lodge of elements volition stay same i.e. the lodge on which they are inserted.

You tin flaming acquire Java collection framework past times starting amongst a mass similar Core Java for Impatient, this volition plough over you lot a basic thought of each collection flat e.g. the information construction they are based upon, of import features together with what makes dissimilar from others. Once you lot know the basics you lot tin flaming acquire for an goodness mass similar Java Generics together with Collection.

The fourth dimension invested inwards learning all of import classes of Collection framework e.g. Vector, ArrayList, HashMap, ConcurrentHashMap is definitely worth together with volition assist on both interview together with your job.

Java Program to convert Vector to array inwards Java

Here is our sample plan to convert a Vector to an array inwards Java without using whatever tertiary political party library similar Apache Commons or Guava. Similar to the before tutorial, this article too has ii examples, showtime 1 converts a Vector of String to an array of String together with the instant 1 converts Vector of Integer values to an array of Integer objects.

While converting Vector to array only live mindful of 1 telephone commutation departure betwixt a Vector together with an array that an array tin flaming concur both primitive together with reference types but Vector tin flaming solely concur reference types, which agency you lot tin flaming lead hold array of ints but you lot cannot lead hold Vector of ints, instead, wrapper object Integer is used inwards house of int primitive.

This agency when you lot convert a Vector of Integer, you lot volition acquire an array of Integer, non the array of int primitives. To acquire to a greater extent than close the departure betwixt primitive together with reference variables, run across this article.

Here is measuring past times measuring guide to convert a Vector to array inwards Java:

nosotros lead hold learned how to convert a LinkedList to array inwards Java together with inwards today How to convert Vector to array inwards Java? 2 Examples

together with hither is our Java plan based upon these steps:

import java.util.Arrays; import java.util.Vector;   public class VectorToArray{  public static void main(String args[]){  // creating together with initializing a Vector of String Vector<String> vectorOfBrands = new Vector<>(); vectorOfBrands.add("Google"); vectorOfBrands.add("Apple"); vectorOfBrands.add("Microsoft");  // printing the contents of Vector before conversion System.out.println("Vector: " + vectorOfBrands);  // Converting the Vector to array String[] arrayOfBooks = vectorOfBrands.toArray(new String[vectorOfBrands.size()]);   // printing contents of array after conversion System.out.println("String array: " + Arrays.toString(arrayOfBooks));   // Second illustration - Creating Vector of Integers Vector<Integer> vectorOfAges = new Vector<>(); vectorOfAges.add(21); vectorOfAges.add(32); vectorOfAges.add(43);  // printing Vector System.out.println("Vector: " + vectorOfAges);  // converting Vector of Integer to array of integers // int[] grade = vectorOfScores.toArray(new int[vectorOfScores.size()]); // compile fourth dimension error Integer[] scores = vectorOfAges.toArray(new Integer[vectorOfAges.size()]); // this is ok  // printing array System.out.println("Integer array: " + Arrays.toString(scores)); } }  Output Vector: [Google, Apple, Microsoft] String array: [Google, Apple, Microsoft] Vector: [21, 32, 43] Integer array: [21, 32, 43]

You tin flaming run across inwards both the cases nosotros lead hold successfully converted a Vector of String together with Integer to an array of String together with Integer. The lodge of the chemical ingredient is preserved because Vector implements the List interface, which guarantees insertion lodge i.e. the lodge on which elements are inserted.

While converting Vector of Integer object to array, As I said, you lot require to transcend the toArray() method an array of Integer together with non the array of int primitive i.e. int[]While converting Vector of Integer object to array, As I said, you lot require to transcend the toArray() method an array of Integer together with non the array of int primitive i.e. int[] volition non work. It volition plough over compile fourth dimension error.

That's all close how to convert a Vector to an array inwards Java. Just think that toArray() method accepts an array of specified type. If you lot supply an array which is smaller than linked listing than this method tin flaming too create a novel array together with inwards instance array is bigger than linked listing than it volition lay nulls on remaining slots. It too maintains the master copy lodge of elements inwards linked listing spell converting to an array.

Further Learning
Java Fundamentals: Collections
From Collections to Streams inwards Java 8 Using Lambda Expressions
Grokking Algorithms past times Aditya Bhargava
Java Programming Interview Exposed past times Makham