61. What value does read() return when it has reached the end of a file? The read() method returns -1 […]
55. Why does Java not support operator overloading? Operator overloading makes the code very difficult to read and maintain. To
49. Why is an Interface be able to extend more than one Interface but a Class can’t extend more than
43. Can a abstract class be defined without any abstract methods? Yes it’s possible. This is basically to avoid instance
37. What is the importance of static variable? static variables are class level variables where all objects of the class
31. Can you give few examples of final classes defined in Java API? java.lang.String, java.lang.Math are final classes. 32. How
25. Can a class declared as private be accessed outside it’s package? Not possible. 26. Can a class be declared
19. Can a main() method be overloaded? Yes. You can have any number of main() methods with different method signature
13. What are instance variables? Instance variables are those which are defined at the class level. Instance variables need not
7. What is the base class of all classes? java.lang.Object 8. Does Java support multiple inheritance? Java doesn’t support multiple
What is the most important feature of Java? Java is a platform independent language. 2. What do you mean by
127. How does Java handle integer overflows and underflows? It uses those low order bytes of the result that can
121. To what value is a variable of the String type automatically initialized? The default value of an String type
15. What is constructor chaining and how is it achieved in Java ? A child object constructor always first needs
109. What is the difference between an if statement and a switch statement? The if statement is used to select
103. What is the difference between a public and a non-public class? A public class may be accessed outside of
97. What are the legal operands of the instanceof operator? The left operand is an object reference or null value
91. Name the eight primitive Java types. The eight primitive types are byte, char, short, int, long, float, double, and
85. Is null a keyword? The null value is not a keyword. 86. Which characters may be used as the
19. Can an application have multiple classes having main() method? Yes it is possible. While starting the application we mention
13. What if I write static public void instead of public static void? Program compiles and runs properly. 14. What
7. What is an Iterator? Some of the collection classes provide traversal of their contents via a java.util.Iterator interface. This
1. What is the difference between a constructor and a method? A constructor is a member function of a class
127. How does Java handle integer overflows and underflows? It uses those low order bytes of the result that can
127. How does Java handle integer overflows and underflows? It uses those low order bytes of the result that can
