Transient variable: the class level variable that has
transient keyword in its definition is called transient variable. Local variable
cannot be declared as transient. It leads to CE: illeagal start expression.
We declare variable as transient to tell to JVM that we do
not want to store variable value in a file in object serialization. Since local
variable is not part object, declaring it as transient is illegal. For more
details on object serialization and transient variable refer IOStreams concept.
Class example {
Static transient int x=10;
Transient int y=20;
}
Volatile variable: the class level variable that has
volatile keyword in its definition is called volatile variable. . Local variable
cannot be declared as volatile. It leads to CE: illeagal start expression.
We declare variable as volatile to tell to JVM that we do
not want to modify variable value concurrently by multiple threads. If we
declare variable as volatile multiple thread are allowed to change its value in
sequence one after one.
Class example {
Static volatile int x=10;
Volatile int y=20;
}
