Table of Contents
- 1 What is the use of serializable in Java?
- 2 How do you make a class serializable in Java?
- 3 What is serializable and why use it?
- 4 What if parent class is not serializable?
- 5 How do you make a bean Serializable?
- 6 How do you make a variable transient in Java?
- 7 How an object can become serializable?
- 8 How can an object become serializable Mcq?
What is the use of serializable in Java?
Serializable is a marker interface (has no data member and method). It is used to “mark” java classes so that objects of these classes may get certain capability.
How do you make a class serializable in Java?
To make a Java object serializable you implement the java. io. Serializable interface. This is only a marker interface which tells the Java platform that the object is serializable.
What is serializable and why use it?
Serialization is the process of converting an object into a stream of bytes to store the object or transmit it to memory, a database, or a file. Its main purpose is to save the state of an object in order to be able to recreate it when needed. The reverse process is called deserialization.
How do you know if a class is serializable?
If you are curious to know if a Java Standard Class is serializable or not, check the documentation for the class. The test is simple: If the class implements java. io. Serializable, then it is serializable; otherwise, it’s not.
What is serializable in Java Mcq?
This set of Java Multiple Choice Questions & Answers (MCQs) focuses on “Serialization – 1”. Explanation: Serialization is the process of writing the state of an object to a byte stream. This is used when you want to save the state of your program to a persistent storage area.
What if parent class is not serializable?
Case 2: If a superclass is not serializable, then subclass can still be serialized. Even though the superclass doesn’t implement a Serializable interface, we can serialize subclass objects if the subclass itself implements a Serializable interface.
How do you make a bean Serializable?
You can control the level of serialization that your Beans undergo:
- Automatic: implement Serializable .
- Selectively exclude fields you do not want serialized by marking with the transient (or static ) modifier.
- Writing Beans to a specific file format: implement Externalizable , and its two methods.
How do you make a variable transient in Java?
transient is a variables modifier used in serialization. At the time of serialization, if we don’t want to save value of a particular variable in a file, then we use transient keyword. When JVM comes across transient keyword, it ignores original value of the variable and save default value of that variable data type.
How do you make a class not inherited in Java?
To prevent inheritance, use the keyword “final” when creating the class. The designers of the String class realized that it was not a candidate for inheritance and have prevented it from being extended.
How do you know if an object is serializable?
You can determine whether an object is serializable at run time by retrieving the value of the IsSerializable property of a Type object that represents that object’s type.
How an object can become serializable?
How an object can become serializable? Explanation: A Java object is serializable if class or any its superclass implements java. io. Explanation: Deserialization is the reverse process of serialization which is turning stream of bytes into an object in memory.