You use the transient keyword to indicate to the Java virtual machine that the indicated variable is not part of the persistent state of the object. Variables that are part of the persistent state of an object must be saved when the object is archived.
At this time the transient marker is ignored by the Java runtime system. Future releases of the Java system will use the transient marker to implement various object archiving functions.
Like other variable modifiers in the Java system you use transient in a class or instance variable declaration like this:
This statement declares an integer variable named hobo that is not part of the persistent state of the TransientExample class.
Transient variable can't be serialize. For example if a variable is declared as transient in a Serializable class and the class is written to an ObjectStream the value of the variable can't be written to the stream instead when the class is retrieved from the ObjectStream the value of the variable becomes null
1 what is a transient variable A transient variable is a variable that may not be serialized.
2 which containers use a border Layout as their default layout The window Frame and Dialog classes use a border layout as their default layout.
3 Why do threads block on I/O Threads block on i/o (that is enters the waiting state) so that other threads may execute while the i/o Operation is performed.
4 How are Observer and Observable used Objects that subclass the Observable class maintain a list of observers. When an Observable object is updated it invokes the update() method of each of its observers to notify the observers that i...
5 What is synchronization and why is it important With respect to multithreading synchronization is the capability to control the access of multiple threads to shared resources. Without synchronization it is possible for one thread to modify a ...
6 Can a lock be acquired on a class Yes a lock can be acquired on a class. This lock is acquired on the class's Class object..
7 What's new with the stop() suspend() and resume() methods in JDK 1.2 The stop() suspend() and resume() methods have been deprecated in JDK 1.2.
8 Is null a keyword The null value is not a keyword.
9 What is the preferred size of a component The preferred size of a component is the minimum component size that will allow the component to display normally.
10 What method is used to specify a container's layout The setLayout() method is used to specify a container's layout.
