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      "body": "# What is volatile\n`volatile` is a keyword in java. `volatile` in Java is used as an indicator to Java compiler and Thread that do not cache value of this variable and always read it from main memory. The Java `volatile` keyword can not be used with method or class and it can only be used with a variable.\n\n# Volatile in kotlin\n`volatile` in Kotlin is replaced by `@Volatile`.\n> `@Target([AnnotationTarget.FIELD]) annotation actual class Volatile`.  \nMarks the JVM backing field of the annotated property as volatile, meaning that writes to this field are immediately made visible to other threads.\n\n# Example in kotlin\n```\npublic class LazySingleton {  \n    private static volatile LazySingleton instance = null;\n    public static LazySingleton getInstance() {\n        if (instance == null) {\n            instance = new LazySingleton();\n        }\n        return instance;\n    }\n}\n```\n\n# When to use\n* If a variable is not shared between multiple threads, you don't need to use volatile keyword with that variable.",
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      "body": "@@ -484,16 +484,82 @@\n ient%60. %0A\n+%3E  %60@Target(%5BAnnotationTarget.FIELD%5D) annotation class Transient%60%0A\n %3E Marks \n",
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      "body": "# What is transient in java\n&emsp;&emsp;**transient**  is a key-word. **Transient** in java is used to on class variable to indicate that  serialization process of such class should ignore such variables. A **Transient variable**  is a variable that can not be serialized.\n> Variables may be marked transient to indicate that they are not part of the persistent state of an object.  __java official doc\n# Transient in kotlin\n&emsp;&emsp;**transient** in kotlin is replaced by `@Transient`. \n> Marks the JVM backing field of the annotated property as transient, meaning that it is not part of the default serialized form of the object.\n\n# How to use in kotlin\n```\n// create serializable object\nclass Rectangle : Serializable {\n    var length: Int = 0\n    var width: Int = 0\n    @Transient var area: Int? = null\n    //calculate rectangle area\n    fun calcArea() {\n        area = length * width\n    }\n}\n\nfun main(args: Array<String>) {\n    val rec = Rectangle()\n    rec.length = 3\n    rec.width = 4\n    rec.calcArea()\n    println(\"area :${rec.area}\") // \"area :12\"\n    //serialize rectangle \n    val recName = \"rec.txt\"\n    val oos = ObjectOutputStream(FileOutputStream(recName))\n    oos.writeObject(rec)\n    oos.flush()\n    oos.close()\n    //de-serialize rectangle\n    val ois = ObjectInputStream(FileInputStream(recName))\n    val deRec = ois.readObject() as Rectangle\n    ois.close()\n\n    println(\"de-Rec area:\" + deRec.area) // \"de-Rec area:null\"\n}\n```\n\n# When to use\n* Field are calculated from other fields within instance of class.\n* For **secure information** which should not leak outside the **JVM**.",
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