What is the difference between a Window and a Frame in Java Programming?
What is a native method in Java Programming?
A native method is a method that is implemented in a language other than Java.
- How can you write a loop indefinitely in Java Programming?
for(;;)–for loop; while(true)–always true, etc.
- Can an anonymous class be declared as implementing an interface and extending a class in Java Programming?
An anonymous class may implement an interface or extend a superclass, but may not be declared to do both.
- What is the purpose of finalization in Java Programming?
The purpose of finalization is to give an unreachable object the opportunity to perform any cleanup processing before the object is garbage collected.
- Which class is the superclass for every class in Java Programming?
Object class is the superclass for every class in Java Programming
- What invokes a thread’s run() method in Java Programming?
After a thread is started, via its start() method or that of the Thread class, the JVM invokes the thread’s run() method when the thread is initially executed.
- What is the difference between the Boolean & operator and the && operator in Java Programming?
If an expression involving the Boolean & operator is evaluated, both operands are evaluated. Then the & operator is applied to the operand. When an expression involving the && operator is evaluated, the first operand is evaluated. If the first operand returns a value of true then the second operand is evaluated. The && operator is then applied to the first and second operands. If the first operand evaluates to false, the evaluation of the second operand is skipped.
Operator & has no chance to skip both sides evaluation and && operator does. If asked why, give details as above.
Operator & has no chance to skip both sides evaluation and && operator does. If asked why, give details as above.
What is the GregorianCalendar class in Java Programming?
The GregorianCalendar provides support for traditional Western calendars in Java Programming.
What is the SimpleTimeZone class in Java Programming?
The SimpleTimeZone class provides support for a Gregorian calendar in Java Programming.
- Which Container method is used to cause a container to be laid out and redisplayed in Java Programming?
validate();
Container method is used to cause a container to be laid out and redisplayed in Java Programming
Container method is used to cause a container to be laid out and redisplayed in Java Programming
What is the Properties class in Java Programming?
The properties class is a subclass of Hashtable that can be read from or written to a stream. It also provides the capability to specify a set of default values to be used.
- What is the purpose of the Runtime class in Java Programming?
The purpose of the Runtime class is to provide access to the Java runtime system in Java Programming.
- What is the purpose of the System class in Java Programming?
The purpose of the System class is to provide access to system resources in Java Programming.
- What is the purpose of the finally clause of a try-catch-finally statement in Java Programming?
The finally clause is used to provide the capability to execute code no matter whether or not an exception is thrown or caught.
What is the Locale class in Java Programming?
The Locale class is used to tailor program output to the conventions of a particular geographic, political, or cultural region.
- What must a class do to implement an interface in Java Programming?
It must provide all of the methods in the interface and identify the interface in its implements clause.
What is the purpose of the wait(), notify(), and notifyAll() methods in Java Programming?
The wait(),notify(), and notifyAll() methods are used to provide an efficient way for threads to communicate each other in Java Programming.
What is an abstract method in Java Programming?
An abstract method is a method whose implementation is deferred to a subclass in Java Programming.
- What are the high-level thread states in Java Programming?
The high-level thread states are ready, running, waiting, and dead.
- What is the difference between a static and a non-static inner class in Java Programming?
A non-static inner class may have object instances that are associated with instances of the class’s outer class. A static inner class does not have any object instances.
- What is an object’s lock and which object’s have locks in Java Programming?
An object’s lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object’s lock. All objects and classes have locks. A class’s lock is acquired on the class’s Class object.
- When can an object reference be cast to an interface reference in Java Programming?
An object reference be cast to an interface reference when the object implements the referenced interface.
25 Aug 2013
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