Technical Question Bank: Advanced Java

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List of Technical Questions based on Advanced Java
  • What is a transient variable?
  • Which containers use a border Layout as their default layout?
  • Why do threads block on I/O?
  • How are Observer and Observable used?
  • What is synchronization and why is it important?
  • Can a lock be acquired on a class?
  • What's new with the stop(), suspend() and resume() methods in JDK 1.2?
  • Is null a keyword?
  • What is the preferred size of a component?
  • What method is used to specify a container's layout?
  • Which containers use a Flow Layout as their default layout?
  • What state does a thread enter into when it terminates its processing?
  • What is the Collections API?
  • Which characters may be used as the second character of an identifier, but not as the first character of an identifier?
  • What is the List interface?
  • How are integer overflows and underflows handled in JAVA?
  • What is a Vector class?
  • What modifiers may be used with an inner class that is a member of an outer class?
  • What is an Iterator interface?
  • What is the difference between the >> and >>> operators?
  • Which method of the Component class is used to set the position and size of a component?
  • Differentiate between yielding and sleeping.
  • Which java util classes and interfaces support event handling?
  • What are wrapped classes?
  • Does garbage collection guarantee that a program will not run out of memory?
  • What restrictions are placed on the location of a package statement within a source code file?
  • Can an object's finalize() method be invoked while it is reachable?
  • What is the immediate superclass of the Applet class?
  • Differentiate between preemptive scheduling and time slicing.
  • Name three Component subclasses that support painting.
  • What value does readLine() return when it reaches the end of a file?
  • What is the immediate superclass of the Dialog class?
  • What is clipping?
  • What is a native method?
  • Can a for statement loop indefinitely?
  • What are order of precedence and associativity, and how are they used?
  • When a thread blocks on I/O, what state does it enter?
  • To what value is a variable of the String type automatically initialized?
  • What is the catch or declare rule for method declarations?
  • What is the difference between a Menu Item and a Checkbox Menu Item?
  • What is a task's priority and how is it used in scheduling?
  • What class is the top of the AWT event hierarchy?
  • What is a thread's initial state when it is created and started?
  • Can an anonymous class be declared while implementing an interface and extending a class?
  • What is the immediate superclass of Menu?
  • Explain the purpose of finalization.
  • Which class is the immediate superclass of the Menu Component class?
  • What invokes a thread's run() method?
  • What is the difference between the Boolean & operator and the && operator?
  • Name three subclasses of the Component class.
  • What is the Gregorian calendar class?
  • Which Container method is used to cause a container to be laid out and redisplayed?
  • Explain the purpose of the Runtime class.
  • How many times may an object's finalize() method be invoked by the garbage collector?
  • What is the purpose of the finally clause of a try-catch-finally statement?
  • What is the argument type of a program's main() method?
  • Which Java operator is right associative?
  • Can we cast a double value to a byte?
  • What must a class do to implement an interface?
  • What method is invoked to cause an object to begin executing as a separate thread?
  • Name two subclasses of the Text Component class.
  • Which containers may have a Menu Bar?
  • How are commas used in the initialization and iteration parts of a 'for' statement?
  • What is the purpose of the wait(), notify(), and notify All() methods?
  • What is an abstract method?
  • How are Java source code files named?
  • What is the relationship between the Canvas class and the Graphics class?
  • What are the high-level thread states?
  • What value does read() return when it has reached the end of a file?
  • Can a Byte object be cast to a double value?
  • What is the difference between a static and a non-static inner class?
  • What is the difference between the String and String Buffer classes?
  • If a variable is declared as private, where may the variable be accessed?
  • What is an object's lock and which objects have locks?
  • What is the Dictionary class?
  • How are the elements of a Border Layout organized?
  • What is the % operator?
  • When can an object reference be cast to an interface reference?
  • What is the difference between a Window and a Frame?
  • Which class is extended by all other classes?
  • Can an object be garbage collected while it is still reachable?
  • The ternary operator written as x : y ? z or x ? y : z
  • What is the difference between the Font and Font Metrics classes?
  • How is rounding performed under integer division?
  • What happens when a thread cannot acquire a lock on an object?
  • What is the difference between the Reader/Writer class hierarchy and the Input Stream/Output Stream class hierarchy?
  • What classes of exceptions may be caught by a catch clause?
  • If a class is declared without any access modifiers, where may the class be accessed?
  • What is the Simple Time Zone class?
  • What is the Map interface?
  • Does a class inherit the constructors of its superclass?
  • For which statements does it make sense to use a label?
  • What is the purpose of the System class?
  • Which Text Component method is used to set a Text Component to the read-only state?
  • How are the elements of a Card Layout organized?
  • Is &&= a valid Java operator?
  • Name the eight primitive Java types.
  • Which class should you use to obtain design information about an object?
  • What is the relationship between clipping and repainting?
  • Is "abc" a primitive value?
  • What is the relationship between an event-listener interface and an event-adapter class?
  • What restrictions are placed on the values of each case of a switch statement?
  • What modifiers may be used with an interface declaration?
  • Is a class a subclass of itself?
  • What is the highest-level event class of the event-delegation model?
  • What event results from the clicking of a button?
  • How can a GUI component handle its own events?
  • How are the elements of a Grid Bag Layout organized?
  • What advantage do Java's layout managers provide over traditional windowing systems?
  • What is the Collection interface?
  • What modifiers can be used with a local inner class?
  • What is the difference between static and non-static variables?
  • What is the difference between the paint() and repaint() methods?
  • What is the purpose of the File class?
  • Can an exception be rethrown?
  • Which Math method is used to calculate the absolute value of a number?
  • How does multithreading take place on a computer with a single CPU?
  • When does the compiler supply a default constructor for a class?
  • When is the finally clause of a try-catch-finally statement executed?
  • Which class is the immediate superclass of the Container class?
  • If a method is declared as protected, where may the method be accessed?
  • How can the Checkbox class be used to create a radio button?
  • Which non-Unicode letter characters may be used as the first character of an identifier?
  • What restrictions are placed on method overloading?
  • What happens when you invoke a thread's interrupt method while it is sleeping or waiting?
  • What is casting?
  • What is the return type of a program's main() method?
  • Name four Container classes
  • What is the difference between a Choice and a List?
  • What class of exceptions is generated by the Java run-time system?
  • What class allows you to read objects directly from a stream?
  • What is the difference between a field variable and a local variable?
  • Under what conditions is an object's finalize() method invoked by the garbage collector?
  • What is the relationship between a method's throws clause and the exceptions that can be thrown during the method's execution?
  • What is the difference between the JDK 1.02 event model and the event-delegation model introduced with JDK 1.1?
  • How is it possible for two String objects with identical values not to be equal under the == operator?
  • Why are the methods of the Math class static?
  • What Checkbox method allows you to tell if a Checkbox is checked?
  • What state is a thread in when it is executing?
  • What are the legal operands of the instance of operator?
  • How are the elements of a GridBagLayout organized?
  • What an I/O filter?
  • If an object is garbage collected, can it become reachable again?
  • What is a Set interface?
  • What classes of exceptions may be thrown by a throw statement?
  • What are E and PI?
  • Explain true and false keywords?
  • What is a void return type?
  • What is the purpose of the enableEvents() method?
  • What is the difference between the File and RandomAccessFile classes?
  • What happens when you add a double value to a String?
  • What is your platform's default character encoding?
  • Which package is always imported by default?
  • What interface must an object implement before it can be written to a stream as an object?
  • How are this and super used?
  • What is a compilation unit?
  • What interface is extended by AWT event listeners?
  • What restrictions are placed on method overriding?
  • How can a dead thread be restarted?
  • What happens if an exception is not caught?
  • What is a layout manager?
  • Which arithmetic operations can result in the throwing of an Arithmetic Exception?
  • What are three ways in which a thread can enter the waiting state?
  • Can an abstract class be final?
  • What is the ResourceBundle class?
  • What happens if a try-catch-finally statement does not have a catch clause to handle an exception that is thrown within the body of the try statement?
  • What is numeric promotion?
  • What is the difference between a Scrollbar and a ScrollPane?
  • What is the difference between a public and a non-public class?
  • To what value is a variable of the boolean type automatically initialized?
  • Can try statements be nested?
  • What is the difference between the prefix and postfix forms of the ++ operator?
  • What is the purpose of a statement block?
  • What is a Java package and how is it used?
  • What modifiers may be used with a top-level class?
  • What are the Object and Class classes used for?
  • How does a try statement determine which catch clause should be used to handle an exception?
  • Can an unreachable object become reachable again?
  • When is an object subject to garbage collection?
  • What method must be implemented by all threads?
  • What methods are used to get and set the text label displayed by a Button object?
  • Which Component subclass is used for drawing and painting?
  • What are synchronized methods and synchronized statements?
  • What are the two basic ways in which classes that can be run as threads may be defined?
  • What are the problems faced by Java programmers who don't use layout managers?
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