37. What is Externalizable interface? Externalizable is an interface which contains two methods readExternal and writeExternal. These methods give you a control over the serialization mechanism. Thus if your class …
31. Primitive data types are passed by reference or pass by value? Primitive data types are passed by value. 32. Objects are passed by value or by reference? Java only …
25. Does importing a package imports the subpackages as well? Example: Does importing com.MyTest.* also import com.MyTest.UnitTests.*? No you will have to import the subpackages explicitly. Importing com.MyTest.* will import …
19. Can an application have multiple classes having main() method? Yes it is possible. While starting the application we mention the class name to be run. The JVM will look …
13. What if I write static public void instead of public static void? Program compiles and runs properly. 14. What if I do not provide the String array as the …
27. How does Java handle integer overflows and underflows? It uses those low order bytes of the result that can fit into the size of the type allowed by the …
121. To what value is a variable of the String type automatically initialized? The default value of an String type is null. 122. What is the difference between a field …
115. What is constructor chaining and how is it achieved in Java ? A child object constructor always first needs to construct its parent (which in turn calls its parent …
109. What is the difference between an if statement and a switch statement? The if statement is used to select among two alternatives. It uses a boolean expression to decide …
103. What is the difference between a public and a non-public class? A public class may be accessed outside of its package. A non-public class may not be accessed outside …
