{"id":1220,"date":"2022-02-25T17:04:10","date_gmt":"2022-02-25T17:04:10","guid":{"rendered":"https:\/\/mdr.foobrdigital.com\/?p=1220"},"modified":"2022-02-25T17:04:10","modified_gmt":"2022-02-25T17:04:10","slug":"java-anonymous-class","status":"publish","type":"post","link":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/2022\/02\/25\/java-anonymous-class\/","title":{"rendered":"Java Anonymous Class"},"content":{"rendered":"\n

In this tutorial, you will learn about anonymous classes in Java with the help of examples.<\/p>\n\n\n\n

In Java, a class can contain another class known as nested class. It’s possible to create a nested class without giving any name.<\/p>\n\n\n\n

A nested class that doesn’t have any name is known as an anonymous class.<\/p>\n\n\n\n

An anonymous class must be defined inside another class. Hence, it is also known as an anonymous inner class. Its syntax is:<\/p>\n\n\n\n

class outerClass {\n\n    \/\/ defining anonymous class\n    object1 = new Type(parameterList) {\n         \/\/ body of the anonymous class\n    };\n}\n<\/code><\/pre>\n\n\n\n
Anonymous classes usually extend subclasses or implement interfaces.<\/p>\n\n\n\n
Here, Type<\/strong> can be<\/p>\n\n\n\n
  1. a superclass that an anonymous class extends<\/li>
  2. an interface that an anonymous class implements<\/li><\/ol>\n\n\n\n
    The above code creates an object, object1<\/code>, of an anonymous class at runtime.<\/p>\n\n\n\n
    Note:<\/strong> Anonymous classes are defined inside an expression. So, the semicolon is used at the end of anonymous classes to indicate the end of the expression.<\/p>\n\n\n\n
    \n\n\n\n
    Example 1: Anonymous Class Extending a Class<\/h3>\n\n\n\n
    class Polygon {\n   public void display() {\n      System.out.println(\"Inside the Polygon class\");\n   }\n}\n\nclass AnonymousDemo {\n   public void createClass() {\n\n      \/\/ creation of anonymous class extending class Polygon\n      Polygon p1 = new Polygon() {\n         public void display() {\n            System.out.println(\"Inside an anonymous class.\");\n         }\n      };\n      p1.display();\n   }\n}\n\nclass Main {\n   public static void main(String[] args) {\n       AnonymousDemo an = new AnonymousDemo();\n       an.createClass();\n   }\n}\n<\/code><\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    Inside an anonymous class.\n<\/samp><\/code><\/pre>\n\n\n\n
    In the above example, we have created a class Polygon<\/var>. It has a single method display()<\/code>.<\/p>\n\n\n\n
    We then created an anonymous class that extends the class Polygon<\/var> and overrides the display()<\/code> method.<\/p>\n\n\n\n
    When we run the program, an object p1<\/var> of the anonymous class is created. The object then calls the display()<\/code> method of the anonymous class.<\/p>\n\n\n\n
    \n\n\n\n
    Example 2: Anonymous Class Implementing an Interface<\/h3>\n\n\n\n
    interface Polygon {\n   public void display();\n}\n\nclass AnonymousDemo {\n   public void createClass() {\n\n      \/\/ anonymous class implementing interface\n      Polygon p1 = new Polygon() {\n         public void display() {\n            System.out.println(\"Inside an anonymous class.\");\n         }\n      };\n      p1.display();\n   }\n}\n\nclass Main {\n   public static void main(String[] args) {\n      AnonymousDemo an = new AnonymousDemo();\n      an.createClass();\n   }\n}\n<\/code><\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    Inside an anonymous class.\n<\/samp><\/code><\/pre>\n\n\n\n
    In the above example, we have created an anonymous class that implements the Polygon<\/code> interface.<\/p>\n\n\n\n
    \n\n\n\n
    Advantages of Anonymous Classes<\/h2>\n\n\n\n
    In anonymous classes, objects are created whenever they are required. That is, objects are created to perform some specific tasks. For example,<\/p>\n\n\n\n
    Object = new Example() {\n   public void display() {\n      System.out.println(\"Anonymous class overrides the method display().\");\n   }\n};\n<\/code><\/pre>\n\n\n\n
    Here, an object of the anonymous class is created dynamically when we need to override the display()<\/code> method.<\/p>\n\n\n\n
    Anonymous classes also help us to make our code concise.<\/p>\n","protected":false},"excerpt":{"rendered":"
    In this tutorial, you will learn about anonymous classes in Java with the help of examples. In Java, a class can contain another class known as nested class. It’s possible to create a nested class without giving any name. A nested class that doesn’t have any name is known as an anonymous class. An anonymous […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[556],"tags":[],"_links":{"self":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1220"}],"collection":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/comments?post=1220"}],"version-history":[{"count":0,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1220\/revisions"}],"wp:attachment":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=1220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=1220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=1220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}