{"id":98,"date":"2012-11-11T19:19:46","date_gmt":"2012-11-11T19:19:46","guid":{"rendered":"http:\/\/ilias-laptop\/examples\/java-basics\/statics\/static-variables-example\/"},"modified":"2020-05-15T18:45:13","modified_gmt":"2020-05-15T15:45:13","slug":"static-variables-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/static-variable-java-example\/","title":{"rendered":"Static Variable Java Example"},"content":{"rendered":"

1. Introduction<\/h2>\n

This is a static variable Java Example. Static variables<\/code> are declared with the static word before the type of variable. The main difference among regular variables is that static variables<\/code> are not bounded by any object instances, and are shared among all instances.<\/p>\n

static datatype Variable\n\/\/static variable example\nstatic int count = 0; <\/pre>\n
2. Simple Static Variable Java Example<\/h2>\n
Static variables<\/code> are useful when we need to declare a specific value among all instances. We can access Static variables<\/code> in 2 ways:<\/p>\n
\n
\"static<\/figure>\n<\/div>\n
    \n
  1.  By Class name<\/li>\n
  2.  By Instance name<\/li>\n<\/ol>\n
     Create a class with name Laptop<\/code> and paste the following code : <\/p>\n
    Laptop.java<\/em><\/span><\/p>\n
    package com.javacodegeeks;\n\/**\n * @author Petros Koulianos\n *\n *\/\npublic class Laptop {\n\n\t\/\/static variable\n\tpublic static String motherboard = \"ASUS\";\n\t\n\tpublic String cpu ;\n\t\n\tpublic String monitor_dimension ;\n\t\n\tpublic String storage ;\n\t\n\t\n\n}\n<\/pre>\n
    Create a second class with name StaticVariableExample1<\/code> and paste the following code :<\/p>\n
    StaticVariableExample1.java<\/em><\/span><\/p>\n
    package com.javacodegeeks;\n \n\/**\n * @author Petros Koulianos\n *\n *\/\npublic class StaticVariableExample1 {\n     \n \n    public static void main(String[] args) {\n           \t\n        Laptop laptop1 = new Laptop();\n         \n        laptop1.cpu = \"i5\";\n         \n        laptop1.monitor_dimension = \"15 inch\";\n         \n        laptop1.storage = \"500 gb\";\n         \n        Laptop laptop2 = new Laptop();\n         \n        laptop2.cpu = \"i3\";\n         \n        laptop2.monitor_dimension = \"17 inch\";\n         \n        laptop2.storage = \"1 tb\";\n         \n        \/\/static variables can be access with Class name or with instance name\n        \/\/preferred way is to refer with Class name\n        System.out.println(\"laptop1  motherboard:\"+Laptop.motherboard+\" cpu:\"+laptop1.cpu+\" monitor_dimension:\"+laptop1.monitor_dimension+\" storage:\"+laptop1.storage);\n         \n        System.out.println(\"laptop2  motherboard:\"+laptop2.motherboard+\" cpu:\"+laptop2.cpu+\" monitor_dimension:\"+laptop2.monitor_dimension+\" storage:\"+laptop2.storage);\n         \n        \/\/ The company has change the motherboard\n        Laptop.motherboard = \"GIGABYTE\";\n         \n         \n        System.out.println(\"laptop1  motherboard:\"+Laptop.motherboard+\" cpu:\"+laptop1.cpu+\" monitor_dimension:\"+laptop1.monitor_dimension+\" storage:\"+laptop1.storage);\n         \n        System.out.println(\"laptop2  motherboard:\"+laptop2.motherboard+\" cpu:\"+laptop2.cpu+\" monitor_dimension:\"+laptop2.monitor_dimension+\" storage:\"+laptop2.storage);\n \n    }\n     \n \n}\n<\/pre>\n
    Example Output<\/em><\/span><\/p>\n
    laptop1  motherboard:ASUS cpu:i5 monitor_dimension:15 inch storage:500 gb\nlaptop2  motherboard:ASUS cpu:i3 monitor_dimension:17 inch storage:1 tb\nlaptop1  motherboard:GIGABYTE cpu:i5 monitor_dimension:15 inch storage:500 gb\nlaptop2  motherboard:GIGABYTE cpu:i3 monitor_dimension:17 inch storage:1 tb\n<\/pre>\n
    The above example shows how to declare a static variable<\/code> and how to access it.
     
    <\/div> <\/div><\/p>\n
    3. Static Variable in Static Blocks  <\/h2>\n
    Static blocks can access static variables<\/code> since static variables<\/code> are initialized before the execution of a static block.  <\/p>\n
    Update Laptop.java<\/code> Class and add the following code:<\/p>\n
       \/\/ static block  can access static variables  \n    static {\n    \t\n    \tSystem.out.println(\"motherboard: \"+motherboard);\n    \t\n    }\n<\/pre>\n
    Now run the StaticVariableExample1.java<\/code> Class <\/p>\n
    Example Output<\/em><\/span><\/p>\n
    motherboard : ASUS\nlaptop1  motherboard:ASUS cpu:i5 monitor_dimension:15 inch storage:500 gb\nlaptop2  motherboard:ASUS cpu:i3 monitor_dimension:17 inch storage:1 tb\nlaptop1  motherboard:GIGABYTE cpu:i5 monitor_dimension:15 inch storage:500 gb\nlaptop2  motherboard:GIGABYTE cpu:i3 monitor_dimension:17 inch storage:1 tb\n<\/pre>\n
    In the above example, we saw that when the static block runs can access and print the static variable<\/code>. <\/p>\n
    4. Static Methods<\/h2>\n
    The static variables<\/code> can also be accessed inside static methods.<\/p>\n
     Update Laptop.java<\/code> Class and add the following code: <\/p>\n
    Laptop.java<\/em><\/span><\/p>\n
    package com.javacodegeeks;\n\/**\n * @author Petros Koulianos\n *\n *\/\npublic class Laptop {\n       \n    \/\/static variable \n    public static String motherboard = \"ASUS\";\n     \n    public String cpu ;\n     \n    public String monitor_dimension ;\n     \n    public String storage ;\n     \n   \/\/ static block  can access static variables \n\t\n\t  static {\n\t  \n\t  System.out.println(\"static block motherboard : \"+motherboard);\n\t  \n\t  }\n\t \n    \n    \/\/This is a Static Methods access static variables \n    static void motherboardname(){\n    \t\n        System.out.println(\"static method motherboard : \"+motherboard);\n        \n    }\n    \n\n \n}\n<\/pre>\n
     Update StaticVariableExample1.java<\/code> Class and add the following code: <\/p>\n
    StaticVariableExample1 .java<\/em><\/span><\/p>\n
    package com.javacodegeeks;\n \n\/**\n * @author Petros Koulianos\n *\n *\/\npublic class StaticVariableExample1 {\n     \n \n    public static void main(String[] args) {\n         \n    \tLaptop.motherboardname();\n    \t\n        Laptop laptop1 = new Laptop();\n         \n        laptop1.cpu = \"i5\";\n         \n        laptop1.monitor_dimension = \"15 inch\";\n         \n        laptop1.storage = \"500 gb\";\n         \n        Laptop laptop2 = new Laptop();\n         \n        laptop2.cpu = \"i3\";\n         \n        laptop2.monitor_dimension = \"17 inch\";\n         \n        laptop2.storage = \"1 tb\";\n         \n        \/\/static variables can be access with Class name or with instance name\n        \/\/preferred way is to refer with Class name\n        System.out.println(\"laptop1  motherboard:\"+Laptop.motherboard+\" cpu:\"+laptop1.cpu+\" monitor_dimension:\"+laptop1.monitor_dimension+\" storage:\"+laptop1.storage);\n         \n        System.out.println(\"laptop2  motherboard:\"+laptop2.motherboard+\" cpu:\"+laptop2.cpu+\" monitor_dimension:\"+laptop2.monitor_dimension+\" storage:\"+laptop2.storage);\n         \n        \/\/ The company has change the motherboard\n        Laptop.motherboard = \"GIGABYTE\";\n         \n         \n        System.out.println(\"laptop1  motherboard:\"+Laptop.motherboard+\" cpu:\"+laptop1.cpu+\" monitor_dimension:\"+laptop1.monitor_dimension+\" storage:\"+laptop1.storage);\n         \n        System.out.println(\"laptop2  motherboard:\"+laptop2.motherboard+\" cpu:\"+laptop2.cpu+\" monitor_dimension:\"+laptop2.monitor_dimension+\" storage:\"+laptop2.storage);\n \n    }\n     \n \n}\n<\/pre>\n
    Now run the StaticVariableExample1.java<\/code> Class <\/p>\n
    Example Output<\/em><\/span><\/p>\n
    static block motherboard : ASUS\nstatic method motherboard : ASUS\nlaptop1  motherboard:ASUS cpu:i5 monitor_dimension:15 inch storage:500 gb\nlaptop2  motherboard:ASUS cpu:i3 monitor_dimension:17 inch storage:1 tb\nlaptop1  motherboard:GIGABYTE cpu:i5 monitor_dimension:15 inch storage:500 gb\nlaptop2  motherboard:GIGABYTE cpu:i3 monitor_dimension:17 inch storage:1 tb\n<\/pre>\n
    5. Static final variables <\/h2>\n
    It is very common to combine static variables<\/code> with the final modifier to declare constants. Keep in mind that by convention final static values<\/a> are spelled in uppercase letters .<\/p>\n
        \/\/final static variable \n    public final static String COMPANY =\"FOO Company\";\n<\/pre>\n
    6. Static variables and  Multithreading  <\/h2>\n
    \u0399t is very important to know that static variables<\/strong> are not Thread-Safe.<\/strong>  This means if 2 or more threads modify the same static variable<\/code>, unexpected and multiple malfunctions can be caused (ex. dead locks etc) .<\/p>\n
     Create a class with name StaticVariableExample2<\/code> and paste the following code : <\/p>\n
    StaticVariableExample2.java<\/em><\/span><\/p>\n
    package com.javacodegeeks;\n\n\/**\n * @author Petros Koulianos\n *\n *\/\n\npublic class StaticVariableExample2 {\n\n\tstatic int counter = 10;\n\t\n\tpublic static void main(String[] args) {\n\t\t\n\t\t\/\/launch first thread with step= -1\n\t\tnewThread(\"first thread\",500,1);\n\t\t\n\t\t\n\t\t\/\/launch second thread with step= -3\n\t\tnewThread(\"second thread\",250,3);\n\t\t\n\t}\n\t\n\tpublic static void newThread(String name , int sleep , int step) {\n\t\t\n\t\tThread th = new Thread() {\n\t\t\t@Override\n\t\t\tpublic void run() {\n\t\t\t\t\n\t\t\t\twhile(counter != 0) {\n\t\t\t\t\t\n\t\t\t\t\tSystem.out.println(\"**\"+name+\"** counter:\"+counter);\n\t\t\t\t\t\n\t\t\t\t\tcounter = counter - step;\n\t\t\t\t\t\n\t\t\t\t\ttry {\n\t\t\t\t\t\t\/\/sleep the thread to slow down the execution\n\t\t\t\t\t\tThread.sleep(sleep);\n\t\t\t\t\t\t\n\t\t\t\t\t} catch (InterruptedException e) {\n\t\t\t\t\t\t\n\t\t\t\t\t\te.printStackTrace();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t\n\t\t\t}\n\t\t\t\n\t\t};\n\t\t\n\t\tth.start();\n\t}\n\n}\n\n<\/pre>\n
    Example Output<\/em><\/span><\/p>\n
    **second thread** counter:10\n**first thread** counter:10\n**second thread** counter:6\n**second thread** counter:3\n**first thread** counter:3\n**second thread** counter:-1\n**first thread** counter:-4\n**second thread** counter:-4\n**second thread** counter:-8\n**first thread** counter:-11\n**second thread** counter:-11\n**second thread** counter:-15\n**first thread** counter:-18\n**second thread** counter:-19\n**second thread** counter:-22\n**first thread** counter:-25\n**second thread** counter:-26\n**second thread** counter:-29\n**first thread** counter:-32\n**second thread** counter:-33\n............................\n<\/pre>\n
    The above example runs 2 separate threads that modify the same static variable<\/code> differently and the result is to fall both threads into a deadlock.<\/strong><\/p>\n
    7. Download the Source Code<\/h2>\n
    This was a Static variable<\/code> Java example.<\/p>\n
    Download<\/strong>
    \nYou can download the full source code of this example here:     Static Variable Java Example<\/strong><\/a><\/div>\n
    Last updated on Sept. 10, 2019<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
    1. Introduction This is a static variable Java Example. Static variables are declared with the static word before the type of variable. The main difference among regular variables is that static variables are not bounded by any object instances, and are shared among all instances. static datatype Variable \/\/static variable example static int count = …<\/p>\n","protected":false},"author":191,"featured_media":1204,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[212,1056],"class_list":["post-98","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-statics","tag-java-basics-2","tag-statics"],"yoast_head":"\nStatic Variable Java Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn more? 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