Java Interview Questions

• Can a Byte object be cast to a double value?

• Can a double value be cast to a byte?

• Can an anonymous class be declared as implementing an interface and

• Can an exception be rethrown?

• Can an Interface be final?

• Can an Interface have an inner class?

• Can an object be garbage collected while it is still reachable?

• Can an object be garbage collected while it is still reachable?

• Can there be an abstract class with no abstract methods in it?

• Can we define private and protected modifiers for variables in

• Can we overload main method in java?

• Does a class inherit the constructors of its superclass?

• How are commas used in the intialization and iteration parts of a for

• How are the elements of a BorderLayout organized?

• How are the elements of a CardLayout organized?

• How are the elements of a GridBagLayout organized?

• How can a GUI component handle its own events?

• How can the Checkbox class be used to create a radio button?

• How is rounding performed under integer division?

• How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8

• How many times may an object's finalize() method be invoked by the

• I made my class Cloneable but I still get 'Can't access protected

• If a class is declared without any access modifiers, where may the

• If a method is declared as protected, where may the method be

• If a variable is declared as private, where may the variable be

• In which package are most of the AWT events that support the

• Is "abc" a primitive value?

• Is a class a subclass of itself?

• Is null a keyword?

• Is the ternary operator written x : y ? z or x ? y : z ?

• Is there any difference between the two declarations, 1. int foo(int

• Name the eight primitive Java types.

• Name three Component subclasses that support painting

• What advantage do Java's layout managers provide over traditional

• What are order of precedence and associativity, and how are they

• What are some alternatives to inheritance?

• What are the different identifier states of a Thread?

• What are the problems faced by Java programmers who dont use layout

• What are wrapped classes?

• What class is the top of the AWT event hierarchy?

• What classes of exceptions may be caught by a catch clause?

• What does it mean that a method or field is "static"?

• What interface is extended by AWT event listeners?

• What is a layout manager?

• What is a local, member and a class variable?

• What is a native method?

• What is an abstract method?

• What is an object's lock and which object's have locks?

• What is casting?

• What is clipping?

• What is Externalizable?

• What is synchronization and why is it important?

• What is the % operator?

• What is the advantage of the event-delegation model over the earlier

• What is the argument type of a program's main() method?

• What is the catch or declare rule for method declarations?

• What is the difference between a break statement and a continue

• What is the difference between a Choice and a List?

• What is the difference between a MenuItem and a CheckboxMenuItem?

• What is the difference between a static and a non-static inner class?

• What is the difference between a while statement and a do statement?

• What is the difference between a Window and a Frame?

• What is the difference between an Applet and an Application?

• What is the difference between preemptive scheduling and time

• What is the difference between the Boolean & operator and the &&

• What is the difference between the Font and FontMetrics classes?

• What is the difference between the paint() and repaint() methods?

• What is the difference between the Reader/Writer class hierarchy and

• What is the hidden bug with the following statement? assert(val++ !=

• What is the immediate superclass of the Applet class?

• What is the immediate superclass of the Dialog class?

• What is the preferred size of a component?

• What is the purpose of finalization?

• What is the purpose of the File class?

• What is the purpose of the finally clause of a try-catch-finally

• What is the purpose of the System class?

• What is the range of the char type?

• What is the relationship between an event-listener interface and an

• What is the relationship between clipping and repainting?

• What is the relationship between the Canvas class and the Graphics

• What is the return type of a program's main() method?

• What is the subtle error in the following code segment?

• What modifiers are allowed for methods in an Interface?

• What modifiers can be used with a local inner class?

• What modifiers may be used with an inner class that is a member of an

• What modifiers may be used with an interface declaration?

• What must a class do to implement an interface?

• What restrictions are placed on method overloading?

• What restrictions are placed on the location of a package statement

• What restrictions are placed on the values of each case of a switch

• What value does read() return when it has reached the end of a file?

• When can an object reference be cast to an interface reference?

• When does the compiler supply a default constructor for a class?

• Which characters may be used as the second character of an

• Which class is extended by all other classes?

• Which class is the immediate superclass of the MenuComponent class

• Which class should you use to obtain design information about an

• Which Component subclass is used for drawing and painting?

• Which containers may have a MenuBar?

• Which containers use a border Layout as their default layout?

• Which containers use a FlowLayout as their default layout?

• Which Java operator is right associative?

• Which non-Unicode letter characters may be used as the first

• Why do threads block on I/O?

• Why isn't there operator overloading? 

Posted in: