Static keyword in java is mainly used to save memory as with the help of static we can declare data one time and access it in a whole program where we need the same data more than one time in a program. After creating static keyword there is no need to declare that data again and again. Static keyword can be used with:<\/p>\n
A static nested class is a class that is declared inside another class with a static <\/strong>modifier. A static nested class can refer directly to static members of the enclosing classes, even if those members are private.<\/p>\n Basic Structure of Static Nested Class:<\/strong><\/span><\/p>\n The basic structure of creating a static nested class is as follows:<\/p>\n Nested classes are generally made static when they have a strong relationship with the enclosing class, but their existence is independent of an instance of the enclosing class. Unlike inner classes, you can instantiate the static nested class even if you have not instantiated the outer class. For example:<\/strong><\/p>\n Program Example of Static Nested Class:<\/strong><\/span><\/p>\n The following program demonstrates the use of static nested class.<\/p>\n Step 1: <\/strong>First we create a class OuterClass <\/strong>in which we create static class InnerClass:<\/strong><\/p>\n Step 2: <\/strong>Second we create a class StaticNested <\/strong>in which we create an object of static nested class InnerClass:<\/strong><\/p>\n Output:<\/strong><\/p>\n Explanation of Example:<\/strong><\/p>\n In the above example, as static keyword is used inside the innerclass so it will be called as\u00a0static class. The s variable is also declared as static so it can be called in the static class.<\/p>\n Any variable when declared with the keyword \u201cstatic\u201d, it is known as static variable or class variable. Static variable is used to fulfill the common properties or behavior of all objects. For example: institute name for\u00a0students is common for all students. The static variable gets memory at class loading time only once in class area.<\/p>\n Program Example of Static Variable:<\/strong><\/span><\/p>\n Let us take an example to show the use of static variable.<\/p>\n Output:<\/strong><\/p>\n Explanation of Program:<\/strong><\/p>\n The above program has a class Employee<\/strong> in which we use static<\/strong> variable company. This variable is common to all employees so we take it static and used to display employee information with different id and name but same company. The advantage to make company variable static is that it save memory as it loads once in a class area at class loading time.<\/p>\n Important Points of Static Variable:<\/strong><\/span><\/p>\n For more details read static variable\u00a0in JAVA<\/a><\/p>\n The static method is similar to instance or class method of a class but with the difference that the static method can be called through the name of class without creating any instance of that class. A static method is also called class method as it is related with a class and not with individual instance of the class.<\/p>\n It is important to note that\u00a0static method can only access static block\u00a0or fields\u00a0and other static methods of a class. This is because static methods can be used even if no object of that class has been created. We will show this in the example below. In case\u00a0from the static method you try to\u00a0access a non static field then compilation error will be generated as the static method does not know which non static field value to use.<\/p>\n Program Example of Static Method:<\/strong><\/span><\/p>\n Let us take an example to show the use of static method.<\/p>\n Step 1: <\/strong>First we create a class Methods <\/strong>in which we declare two static methods:<\/p>\n Step 2: <\/strong>Second we create a class StaticMethod <\/strong>in which we call the above class methods:<\/p>\n Output:<\/strong><\/p>\n Important Points of Static Method:<\/strong><\/span><\/p>\n Static keyword in java is mainly used to save memory as with the help of static we can declare data one time and access it in a whole program where we need the same data more than one time in a program. After creating static keyword there is no need to declare that data again … Continue reading Static Keyword In Java With Examples<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,79],"tags":[],"class_list":["post-1182","post","type-post","status-publish","format-standard","hentry","category-archieve","category-java-basics"],"psp_head":"class OuterClass\r\n{\r\n\r\n static class InnerClass\r\n {\r\n\r\n \/\/body of static nested class\r\n\r\n }\r\n\r\n \/\/more members of outside class\r\n\r\n}<\/pre>\nOuterClassName.InnerClassName=new OuterClassName.InnerClassName();<\/pre>\n
class OuterClass\r\n{\r\n\r\n double d=16.5;\r\n\r\n static String s=\"Static\";\r\n\r\n static class InnerClass\r\n {\r\n\r\n int x;\r\n\r\n public void show()\r\n {\r\n\r\n x=6;\r\n\r\n System.out.println(\"value of x is:\"+x);\r\n\r\n System.out.println(\"value of s is:\"+s);\r\n\r\n }\r\n\r\n }\r\n\r\n}<\/pre>\nclass StaticNested\r\n{\r\n\r\n public static void main(String[] args)\r\n {\r\n\r\n OuterClass.InnerClass obj1=new OuterClass.InnerClass();\r\n\r\n Obj1.show();\r\n\r\n }\r\n\r\n}<\/pre>\nvalue of x is: 6\r\nvalue of s is: Static<\/pre>\n
\nStatic Variable<\/strong><\/h4>\n
class\u00a0Employee\r\n{\r\n\r\n int\u00a0id;\r\n\r\n String\u00a0name;\r\n\r\n static\u00a0String\u00a0company\u00a0=\"Ducat\";\r\n\r\n Employee(int\u00a0i,String\u00a0n)\r\n {\r\n\r\n id\u00a0=\u00a0i;\r\n\r\n name\u00a0=\u00a0n;\r\n\r\n }\r\n\r\n void\u00a0print\u00a0()\r\n {\r\n\r\n System.out.println(id+\"\u00a0\"+name+\"\u00a0\"+company);\r\n\r\n }\r\n\r\n public\u00a0static\u00a0void\u00a0main(String\u00a0args[])\r\n\r\n {\r\n\r\n Employee\u00a0e1\u00a0=\u00a0new\u00a0Employee(111,\"Gourav\");\r\n\r\n Employee e2\u00a0=\u00a0new\u00a0Employee(222,\"Nishant\");\r\n\r\n e1.print();\r\n\r\n e2.print();\r\n\r\n }\r\n\r\n}<\/pre>\n111 Gourav Ducat\r\n222 Nishant Ducat<\/pre>\n
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\nStatic Method<\/strong><\/h4>\n
class Methods\r\n{\r\n\r\n static int add(int a,int b)\r\n {\r\n\r\n return (a+b);\r\n\r\n }\r\n\r\n static void show()\r\n {\r\n\r\n System.out.println(\"show method\");\r\n\r\n }\r\n\r\n}<\/pre>\nclass StaticMethod extends Methods\r\n{\r\n\r\n public static void main(String[] args)\r\n {\r\n\r\n int result =add(6, 7);\r\n\r\n System.out.println(\"Result is:\" + result);\r\n\r\n show();\r\n\r\n }\r\n\r\n}<\/pre>\nResult is: 13\r\nshow method<\/pre>\n
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