Question: Are the imports checked for validity at compile time? e.g. will the code containing an import such as java.lang.ABCD compile?

Question: Does importing a package imports the subpackages as well? e.g. Does
importing com.MyTest.* also import com.MyTest.UnitTests.*?

Question: What is the difference between declaring a variable and defining a
variable?

Question: What is the default value of an object reference declared as an instance
variable?

Question: Can a top level class be private or protected?

Question: What type of parameter passing does Java support?

Question: Primitive data types are passed by reference or pass by value?

Question: Objects are passed by value or by reference?

Question: What is serialization?

Question: How do I serialize an object to a file?

Question: Which methods of Serializable interface should I implement?

Question: How can I customize the seralization process? i.e. how can one have a
control over the serialization process?

Question: What is the common usage of serialization?

Question: What is Externalizable interface?

Question: When you serialize an object, what happens to the object references included in the object?

Question: What one should take care of while serializing the object?

Question: What happens to the static fields of a class during serialization?