{"id":2451,"date":"2016-09-25T14:34:10","date_gmt":"2016-09-25T14:34:10","guid":{"rendered":"http:\/\/www.jquery-az.com\/?p=2451"},"modified":"2023-11-17T11:37:18","modified_gmt":"2023-11-17T11:37:18","slug":"java-vector-the-dynamic-arrays-explained-with-6-examples","status":"publish","type":"post","link":"https:\/\/www.jquery-az.com\/java-vector-the-dynamic-arrays-explained-with-6-examples\/","title":{"rendered":"Vectors in Java &#8211; The Dynamic Arrays"},"content":{"rendered":"<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-11388\" src=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2016\/09\/Vectors-in-Java.jpg\" alt=\"Informative infographic highlighting key features of Java Vectors. Learn about synchronization, dynamic sizing, and legacy methods. A comprehensive guide for developers.\" width=\"700\" height=\"600\" srcset=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2016\/09\/Vectors-in-Java.jpg 700w, https:\/\/www.jquery-az.com\/wp-content\/uploads\/2016\/09\/Vectors-in-Java-300x257.jpg 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/p>\n<div class=\"bullet-1\">\n<p style=\"text-align: center;\"><strong>Java vector class<\/strong><\/p>\n<p>In <a href=\"\/6-examples-of-java-array-create-initialize-and-access-arrays\/\">the arrays chapter<\/a>, we learned the standard arrays in Java are of <strong>fixed size<\/strong>. Once created, the size of the\u00a0array cannot be changed or you can say, the elements in the\u00a0standard array cannot be added or removed after creation.<\/p>\n<p>In Java programming, you will need to work with arrays that are dynamic; and that allow adding or removing elements after creation.<\/p>\n<p>For that purpose, <strong>you may use vectors in Java that implement dynamic arrays.<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\">Vector&lt;String&gt; vectFruits = new Vector&lt;String&gt;();\r\n\r\n\/\/Adding elements\r\nvectFruits.add(\"Apple\");\r\nvectFruits.add(\"Mango\");\r\nvectFruits.add(\"Banana\");\r\n\r\n\/\/Remove elements\r\nvectFruits.remove(0);\r\n\r\n\/\/Access\r\nString element = vectFruits.get(1);<\/pre>\n<ul>\n<li>Vectors implement the List interface<\/li>\n<li>Ordered collections of elements<\/li>\n<li>Vectors dynamically resize themselves<\/li>\n<li>Allow for random access, insertion, and deletion of elements.<\/li>\n<li>Vectors are synchronized<\/li>\n<li>Vectors are thread-safe<\/li>\n<\/ul>\n<\/div>\n<h3><strong>An example of a Java vector class with strings<\/strong><\/h3>\n<p>Before describing how to declare and access vectors, let me show you a few examples of using this in Java programs.<\/p>\n<p>In this example, a vector of string elements is created. Three elements are added by using the <strong>add<\/strong> method after vector declaration. This is followed by using the <a href=\"\/6-variety-of-examples-of-using-java-for-loop\/\">for loop<\/a> for displaying the elements:<\/p>\n<p><strong>The Java code with vector class:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\">import java.util.*;\r\n\r\npublic class vector_demo {\r\n\r\n\u00a0\u00a0\u00a0 public static void main(String []args) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Vector&lt;String&gt; vectStr = new Vector&lt;String&gt;(); \/\/Declaring a Vector in Java\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectStr.add(\"The\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectStr.add(\"Vector\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectStr.add(\"Tutorial\");\r\n\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/Displaying vector elements\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"The Vector elements are:\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"\");\r\n\r\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (int i=0;i&lt;vectStr.size();i++){\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(vectStr.get(i));\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0}\u00a0\u00a0\u00a0\u00a0\r\n}<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<div class=\"codeoutput\">The Vector elements are:<br \/>\nThe<br \/>\nVector<br \/>\nTutorial<\/div>\n<h3><strong>An example of integer-type vector class<\/strong><\/h3>\n<p>In the following example, the vector of integer elements is created. Five elements are added to the vector after declaring it by using the add method.<\/p>\n<p><a href=\"\/java-foreach-loop-to-iterate-through-arrays-and-collections\/\">The for-each loop is used<\/a> for displaying the vector items as shown below:<\/p>\n<p><strong>The code:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\">import java.util.*;\r\n\r\npublic class vector_demo {\r\n\r\n\u00a0\u00a0\u00a0 public static void main(String []args) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Vector&lt;Integer&gt; vectInt = new Vector&lt;Integer&gt;(); \/\/Declaring a Vector in Java\r\n\r\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(111);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(222);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(333);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(444);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(555);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/Displaying vector elements\r\n\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"The Integer Vector elements are:\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (int currVectorElement : vectInt) {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(currVectorElement);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0}\u00a0\u00a0\u00a0\u00a0\r\n\r\n}<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<div class=\"codeoutput\">The Integer Vector elements are:111<br \/>\n222<br \/>\n333<br \/>\n444<br \/>\n555<\/div>\n<h3><strong>More about vectors<\/strong><\/h3>\n<div class=\"bullet-1\">\n<ul>\n<li>The vectors are synchronized unlike the <a href=\"\/java-arraylist-explained-with-8-examples\/\">ArrayList (that are also dynamic)<\/a>.<\/li>\n<li>The vectors use capacity and <em>capacityIncrement<\/em> for optimizing storage management. The capacity, which is as large as the vector size is generally larger because the vector size increases in chunks as components are added to the vector.<\/li>\n<li>Also, from the Java 2 platform, the vector class implements the List interface.<\/li>\n<li>The ArrayList also implements the List interface; however, as mentioned earlier, the ArrayList is not synchronized.<\/li>\n<li>You should prefer using the vector class if the thread-safe implementation is required. Otherwise, prefer using the ArrayList.<\/li>\n<\/ul>\n<\/div>\n<h3><strong>How to declare a vector?<\/strong><\/h3>\n<p>Following is the syntax for creating a vector in a Java program:<\/p>\n<div class=\"codesdiv1\">Vector&lt;Integer&gt; vector_name = new Vector&lt;Integer&gt;();<\/div>\n<p>The Vector class is followed by the type and vector name on the left side. On the right side, the new keyword is used which is followed by Vector class. Optionally, you may specify the size of vector, e.g.<\/p>\n<div class=\"codesdiv1\">Vector&lt;Integer&gt; vector_name = new Vector&lt;Integer&gt;(5);<\/div>\n<p>If you do not specify the data type at the time of declaration, the vector may contain different types of elements like Strings, integers etc.<\/p>\n<h3><strong>Creating vectors from another collection type<\/strong><\/h3>\n<p>You may also create a vector by using the other collection type like ArrayList. Following is the syntax:<\/p>\n<div class=\"codesdiv1\">Vector vector_name = new Vector (Collection c) ;<\/div>\n<p>See the following example where I have created an ArrayList with five elements. This is followed by creating a vector where that ArrayList object is specified. Finally, a for loop is used for displaying the elements of that vector:<\/p>\n<p><strong>Code for creating a vector from an ArrayList:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\">import java.util.*;\r\n\r\npublic class vector_demo {\r\n\r\n\u00a0\u00a0\u00a0 public static void main(String []args) {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ArrayList&lt;String&gt; arrlst1 = new ArrayList&lt;String&gt;(); \/\/Declaring ArrayList\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 arrlst1.add(\"Creating\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 arrlst1.add(\"Vector\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 arrlst1.add(\"From\");\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 arrlst1.add(\"ArrayList\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Vector&lt;String&gt; Vect_from_ArrayList = new Vector&lt;String&gt;(arrlst1); \/\/Declaring Vector from ArrayList\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/Displaying vector elements\r\n\r\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"The vector elements after creating from ArrayList:\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\" \");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (int i=0;i&lt;Vect_from_ArrayList.size();i++){\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"Element No \"+i +\": \" +Vect_from_ArrayList.get(i));\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0}\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\r\n}<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<div class=\"codeoutput\">The vector elements after creating from ArrayList:<br \/>\nElement No 0: Creating<br \/>\nElement No 1: Vector<br \/>\nElement No 2: From<br \/>\nElement No 3: ArrayList<\/div>\n<h3><strong>A demo of adding elements at specific position by add method<\/strong><\/h3>\n<p>In the above examples, the elements in the vector are added by using the add method in sequence.<\/p>\n<p>The add method allows adding the elements at the specific position as well. For that, provide the <strong>index number<\/strong> and elements to be added in brackets separated by a comma. See the code and output below:<\/p>\n<p><strong>Java code:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\">import java.util.*;\r\n\r\npublic class vector_demo {\r\n\r\n\u00a0\u00a0\u00a0 public static void main(String []args) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Vector&lt;Integer&gt; vectInt = new Vector&lt;Integer&gt;(); \/\/Declaring a Vector in Java\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(111);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(222);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(444);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(666);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/Displaying vector elements\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"The vector before adding items in specific position:\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (int currVectorElement : vectInt) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(currVectorElement);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/Adding new items at specific positions\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(2,333);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectInt.add(4,555);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/Displaying vector elements\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"The vector after adding items in specific position:\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (int currVectorElement : vectInt) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(currVectorElement);\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\r\n\u00a0}\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\r\n}<\/pre>\n<p><strong>Result:<\/strong><\/p>\n<div class=\"codeoutput\">The vector before adding items in specific position:<br \/>\n111<br \/>\n222<br \/>\n444<br \/>\n666<br \/>\nThe vector after adding items in specific position:<br \/>\n111<br \/>\n222<br \/>\n333<br \/>\n444<br \/>\n555<br \/>\n666<\/p>\n<\/div>\n<h3><strong>Getting the length of vector by using size method<\/strong><\/h3>\n<p>The size method returns the total number of elements in the specified vector. See the demo below where I have used the size method twice.<\/p>\n<p>One for displaying the total elements in the vector. The other is used in the for loop for specifying the maximum number of times the for loop should run:<\/p>\n<p><strong>The code:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\">import java.util.*;\r\n\r\npublic class vector_demo {\r\n\r\n\u00a0\u00a0\u00a0 public static void main(String []args) {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Vector&lt;String&gt; vectSize = new Vector&lt;String&gt;(); \/\/Declaring a Vector in Java\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectSize.add(\"The\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectSize.add(\"Vectors\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectSize.add(\"are\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectSize.add(\"Synchronized\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/Displaying vector elements\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"The size of the Vector: \" + vectSize.size());\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (int i=0;i&lt; vectSize.size();i++){\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(vectSize.get(i));\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0}\u00a0\u00a0\u00a0\u00a0\r\n\r\n}<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<div class=\"codeoutput\">The size of the Vector: 4The<br \/>\nVectors<br \/>\nare<br \/>\nSynchronized<\/div>\n<p>You saw\u00a0it returned 4 as the size of the\u00a0vector.<\/p>\n<h3><strong>An example of accessing a specific element of vector<\/strong><\/h3>\n<p>By using the <strong>get() method<\/strong>, you may access the\u00a0specific element of the vector. See a demonstration below:<\/p>\n<p>The code:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\">import java.util.*;\r\n\r\npublic class vector_demo {\r\n\r\n\u00a0\u00a0\u00a0 public static void main(String []args) {\r\n\r\n\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0Vector&lt;String&gt; vectSize = new Vector&lt;String&gt;(); \/\/Declaring a Vector in Java\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectSize.add(\"The\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectSize.add(\"Vectors\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectSize.add(\"implements\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectSize.add(\"List\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 vectSize.add(\"interface\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/Displaying vector elements\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"The vector element at index 3 = \" + vectSize.get(3));\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\r\n}<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<div class=\"codeoutput\">The vector element at index 3 = List<\/div>\n<p>The element index is given in the get method and it returns its value which is <strong><em>List<\/em><\/strong> in the above example.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java vector class In the arrays chapter, we learned the standard arrays in Java are of fixed size. Once created, the size of the\u00a0array cannot be changed or you can say, the elements in the\u00a0standard array cannot be added or removed after creation. In Java programming, you will need to work with arrays that are &#8230; <a title=\"Vectors in Java &#8211; The Dynamic Arrays\" class=\"read-more\" href=\"https:\/\/www.jquery-az.com\/java-vector-the-dynamic-arrays-explained-with-6-examples\/\" aria-label=\"More on Vectors in Java &#8211; The Dynamic Arrays\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":11388,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[19],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Vectors in Java - The Dynamic Arrays<\/title>\n<meta name=\"description\" content=\"Java Vectors with in-depth explanations and practical examples. 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