{"id":80098,"date":"2019-10-29T09:34:20","date_gmt":"2019-10-29T07:34:20","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=80098"},"modified":"2022-07-06T13:45:31","modified_gmt":"2022-07-06T10:45:31","slug":"declare-array-java-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/declare-array-java-example\/","title":{"rendered":"Declare Array Java Example"},"content":{"rendered":"<p>In this tutorial, we will learn how to declare arrays in Java. We will  explain what an array is and how to initialize it in Java using examples.<\/p>\n<p>You can watch the following video and learn how to use <code>arrays<\/code> in Java:<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.youtube.com\/watch?v=xjyl8kHeA1E\"><img decoding=\"async\" src=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2022\/07\/How-to-use-Arrays-in-Java-1024x576.jpg\" alt=\"\" class=\"wp-image-113904\" width=\"512\" height=\"288\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2022\/07\/How-to-use-Arrays-in-Java-1024x576.jpg 1024w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2022\/07\/How-to-use-Arrays-in-Java-300x169.jpg 300w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2022\/07\/How-to-use-Arrays-in-Java-768x432.jpg 768w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2022\/07\/How-to-use-Arrays-in-Java.jpg 1280w\" sizes=\"(max-width: 512px) 100vw, 512px\" \/><\/a><figcaption> Java Array Example How to use Arrays in Java &#8211; Video<\/figcaption><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\" id=\"h-1-introduction\">1. Introduction<\/h2>\n<p>Java programming offer <code>Arrays<\/code> to store the elements of a similar data-type. <code>Arrays<\/code><\/p>\n<ul class=\"wp-block-list\">\n<li>Once defined, the array size is fixed and <em>cannot<\/em> increase to accommodate more elements<\/li>\n<li>The first element in an array starts with index <code>0<\/code> and so on<\/li>\n<li>Elements share a common memory location<\/li>\n<li>Offers code optimization and random access to the elements<\/li>\n<\/ul>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"818\" height=\"421\" src=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2019\/10\/java-arrays-example-introduction.jpeg\" alt=\"Declare Array Java - Arrays in Java\" class=\"wp-image-80099\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2019\/10\/java-arrays-example-introduction.jpeg 818w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2019\/10\/java-arrays-example-introduction-300x154.jpeg 300w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2019\/10\/java-arrays-example-introduction-768x395.jpeg 768w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><figcaption>Fig. 1: Arrays in Java<\/figcaption><\/figure>\n<\/div>\n<h3>1.1 Types of Array<\/h3>\n<p>Java programming language supports two types of arrays \u2013<\/p>\n<ul>\n<li>Single dimensional array<\/li>\n<li>Multi-dimensional or 2D array \u2013 This array is rarely used in a programming language, so we are listing here for knowledge purposes only<\/li>\n<\/ul>\n<h3>1.2 How to use an Array?<\/h3>\n<p>In Java programming language, using an array is 3-step process i.e.<\/p>\n<ol>\n<li>Declaring an Array<\/li>\n<li>Constructing an Array<\/li>\n<li>Initializing an Array<\/li>\n<\/ol>\n<p>Let us see a few examples to understand the process of using an array. To start with, we are hoping that users at present have their preferred Ide installed on their machines. For easy usage, I am using Eclipse Ide on a Windows operating system.<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<h2>2. Declare Array Java Example<\/h2>\n<p>In this example, we\u2019ll demonstrate three different examples to illustrate the use of <code>Arrays<\/code> in the Java programming language. For a better understanding, developers can execute the below code in Eclipse Ide.<\/p>\n<h3>2.1 First Array Example<\/h3>\n<p>Let us see the simple example of Java Array, where we\u2019ll declare, instantiate, initialize, and traverse an array.<\/p>\n<p><span style=\"text-decoration: underline\"><em>Firstarrayexample.java<\/em><\/span><\/p>\n<pre class=\"brush:java; wrap-lines:false;\">package com.java.arrays;\n\n\/\/ Java program to illustrate declaration, instantiation, initialization, and traversing the array.\npublic class Firstarrayexample {\n\n\tpublic static void main(String[] args) {\n\n\t\t\/\/ Array declaration and instantiation.\n\t\t\/\/ Allocating memory for 7 integers.\n\t\tint[] arr = new int[7];\n\n\t\t\/\/ Array initialization.\n\t\tfor(int count=0; count&lt;7; count++) {\n\t\t\tarr[count] = count+1;\n\t\t}\n\n\t\t\/\/ Calculating the array length.\n\t\tint arrayLength = arr.length;\n\t\t\/\/ Traversing the array.\n\t\tfor(int i=0; i&lt;arrayLength; i++) {\n\t\t\tSystem.out.println(\"Element at index \" + i +\" : \"+ arr[i]);\n\t\t}\n\t}\n}\n<\/pre>\n<p>If everything goes well, the following output will be printed in the Ide console.<\/p>\n<p><span style=\"text-decoration: underline\"><em>Output<\/em><\/span><\/p>\n<pre class=\"brush:plain; wrap-lines:false;\">Element at index 0 : 1\nElement at index 1 : 2\nElement at index 2 : 3\nElement at index 3 : 4\nElement at index 4 : 5\nElement at index 5 : 6\nElement at index 6 : 7\n<\/pre>\n<h3>2.2 Second Array Example<\/h3>\n<p>Let us see an example, where we\u2019ll declare, instantiate, initialize, and traverse a multi-dimensional array.<\/p>\n<p><span style=\"text-decoration: underline\"><em>Secondarrayexample.java<\/em><\/span><\/p>\n<pre class=\"brush:java; wrap-lines:false;\">package com.java.arrays;\n\n\/\/ Java program to illustrate the use of a multidimensional array.\npublic class Secondarrayexample {\n\n\tpublic static void main(String[] args) {\n\t\t\/\/ Declaring and initializing the 2D array.  \n\t\tint arr[][] = {{1,2,3}, {4,5,6}, {7,8,9}};\n\n\t\t\/\/ Printing the 2D array.\n\t\tfor(int i=0; i&lt;3; i++) {  \n\t\t\tfor(int j=0; j&lt;3; j++) {  \n\t\t\t\tSystem.out.print(arr[i][j] + \" \");  \n\t\t\t}\n\t\t\tSystem.out.println();\n\t\t}\n\t}\n}\n<\/pre>\n<p>If everything goes well, the following output will be printed in the Ide console.<\/p>\n<p><span style=\"text-decoration: underline\"><em>Output<\/em><\/span><\/p>\n<pre class=\"brush:plain; wrap-lines:false;\">1 2 3 \n4 5 6 \n7 8 9 \n<\/pre>\n<h3>2.3 Array of Objects Example<\/h3>\n<p>Let us see an example, where we\u2019ll declare, instantiate, initialize, and traverse an array of objects just like an array of data-type in Java.<\/p>\n<p><span style=\"text-decoration: underline\"><em>Thirdarrayexample.java<\/em><\/span><\/p>\n<pre class=\"brush:java; wrap-lines:false;\">package com.java.arrays;\n\nclass Employee {\n\tpublic int id;\n\tpublic String name;\n\n\tEmployee() { }\n\n\tEmployee(final int id, final String name) {\n\t\tthis.id = id;\n\t\tthis.name = name;\n\t}\n\n\t@Override\n\tpublic String toString() {\n\t\treturn \"Employee [id=\" + id + \", name=\" + name + \"]\";\n\t}\n}\n\n\/\/ Java program to illustrate the use of an array of objects.\npublic class Thirdarrayexample {\n\n\tpublic static void main(String[] args) {\n\t\tEmployee[] emp_array = new Employee[3];\n\t\temp_array[0] = new Employee(101, \"Abc\");\n\t\temp_array[1] = new Employee(102, \"Pqr\");\n\t\temp_array[2] = new Employee(103, \"Xyz\");\n\n\t\tfor(int x=0; x&lt;emp_array.length; x++) {\n\t\t\tSystem.out.println(\"Element at \" + x + \" : \" + emp_array[x].toString());\n\t\t}\n\t}\n}\n<\/pre>\n<p>If everything goes well, the following output will be printed in the Ide console.<\/p>\n<p><span style=\"text-decoration: underline\"><em>Output<\/em><\/span><\/p>\n<pre class=\"brush:plain; wrap-lines:false;\">Element at 0 : Employee [id=101, name=Abc]\nElement at 1 : Employee [id=102, name=Pqr]\nElement at 2 : Employee [id=103, name=Xyz]\n<\/pre>\n<p>That is all for this tutorial and I hope the article served you whatever you were looking for. Happy Learning and do not forget to share!<\/p>\n<h2>3. Conclusion<\/h2>\n<p>In this tutorial, we learned how to declare and instantiate an <code>ARRAY<\/code> in Java. Developers can download the sample application as an Eclipse project in the <a href=\"#projectDownload\">Downloads<\/a> section.<\/p>\n<h2><a name=\"projectDownload\"><\/a>4. Download the Eclipse Project<\/h2>\n<p>This was an example of <code>ARRAYS<\/code> in Java programming language.<\/p>\n<div class=\"download\"><strong>Download<\/strong><br \/>You can download the full source code of this example here: <a target=\"_blank\" href=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2019\/10\/DeclareArraysInJava.zip\" rel=\"noopener noreferrer\"><strong>Declare Array Java Example<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In this tutorial, we will learn how to declare arrays in Java. We will explain what an array is and how to initialize it in Java using examples. You can watch the following video and learn how to use arrays in Java: Java Array Example How to use Arrays in Java &#8211; Video 1. Introduction &hellip;<\/p>\n","protected":false},"author":119,"featured_media":1204,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[478,212],"class_list":["post-80098","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-core-java","tag-java","tag-java-basics-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Declare Array Java Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"In this tutorial, we will learn how to declare arrays in Java. We will explain what an array is and how to initialize it in Java using examples. 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