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What are wrapper classes? What is singleton class in Java? Can a top level class be private or protected in java Are Polymorphism , Overloading and Overriding similar concepts? Why can't a Java class be declared as static? Why does Java not support operator overloading? It converts the byte sequence into original object data. During the serialization, when we do not want an object to be serialized we can use a transient keyword.
The transient keyword can be used with the data members of a class in order to avoid their serialization. For example, if a program accepts a user's login details and password. But we don't want to store the original password in the file. Here, we can use transient keyword and when JVM reads the transient keyword it ignores the original value of the object and instead stores the default value of the object.
Let's take an example, we have declared a class as Student , it has three data members id, name and age. If you serialize the object, all the values will be serialized but we don't want to serialize one value, e. In this example, we have created two classes Student and PersistExample.
The age data member of the Student class is declared as transient, its value will not be serialized. In this article, we have discussed use of transient keyword in Java, where to use transient keyword and implementation of transient keyword in a Java program.
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Java Serialization Java transient keyword. Next Topic Java Networking. Reinforcement Learning. R Programming. React Native. Privacy policy. Guest Posts. Secure Hash Algorithms. Best Way to Learn Java. How to Start New Blog. Skip to content. Table of Contents 1. What is transient keyword in Java? When should we use transient keyword in java? Usage of transient with final keyword 4. Case study: How does a HashMap use transient? Summary Notes 1. What is Java transient keyword The modifier transient in java can be applied to field members of a class to turn off serialization on these field members.
They should be calculated programmatically everytime rather than having the state be persisted via serialization. An example could be time-stamp based value; such as age of a person OR duration between a timestamp and current timestamp. In both cases, you would be calculating value of variable based on current system time rather than when the instance was serialized.
Second logical example can be any secure information which should not leak outside the JVM in any form either in database OR byte stream.
Absolutely no use. You serialize the information which represent the state of instance, logically. Loggers never share the state of an instance.
Similar example can be reference of a Thread class. Read More : A min guide for implementing serializable interface 3. Transient with final I am talking about use of transient with final keyword specifically because it behaves differently in different situations which is not generally the case with other keywords in java. Lokesh Gupta password null This is strange. If you want to persist the state of non-serializable fields then use readObject and writeObject methods.
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