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Casting between object references is used to refer to an object by a compatible class, interface, or array type reference.

After reading these tricky Core Java questions, you can easily attempt the objective type and multiple choice type questions on Core Java.

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Source code file may contain maximum one public class or interface in the file.

Two cases me occur while naming of the java source code file: - When public class or interface is defined within a source code file then the java source code file must take the name of the public class or interface defined while coding.

When no public class or interface is defined inside a source code file, then the java source code file take a name that is different than its classes and interfaces.

Using algorithm layout manager automatically arranges the controls within a window.

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But we do not do it manual because of following two reasons: - It is very tedious to manually lay out a large number of components.

Sometimes the width and height information is not available when you need to arrange some control, because the native toolkit components have not been realized.

Java uses layout managers to lay out components in a consistent manner across all windowing platforms.

List allow pairs of elements e1 and e2 such that e1.equals(e2), and they typically allow multiple null elements if they allow null elements at all.

When components are unable to handle a particular event, then event is inherited by the component container.

In the event-delegation model, specific objects are designated as event handlers for GUI components.

These objects implement event-listener interfaces.

The JDK 1.02 event model uses an event inheritance.

This conversation is performed so that we can easily perform the calculation on it.

It is the conversion of a smaller numeric type to a larger numeric type, so that integer and floating-point operations can be performed over it.

In this byte, char, and short values are converted to int values.

The int values are also converted to long values.

It is not the replacement for the AWT.

The advantages of Swing components is components are not rendered on the screen by the operating system, the look and feel of a component does not change when application is running on different platform using different versions.

Networking programming classes ease the programming of network applications.

Java networking like anything else in Java is platform-independent.

It is divided into two pieces: - User Adjustable Security Manager: checks various API operations like file access - Byte Code Verifier: that asserts the validity of compiled byte code.

Public abstract class SecurityManager java.lang.

SecurityManager is an abstract class which helps to different applications subclass to implement a particular security policy.

It allows an application to determine whether or not a particular operation will generate a security exception.

Uses of Marker Interfaces are following: - We use Marker interface to tell java compiler to add special behavior to the class implementing it.

Java marker interface has no members in it.

It is implemented by classes to get some functionality.

Example: When we want to save the state of an object then we implement serializable interface.

The scheduler then determines which task should execute next, based on priority and other factor.

If you submitted the task with submit any thrown exception, checked or not, is then part of the task return status.

It is ensured for unexpected error, the finally block do the execution which is mention in last clause of a try catch block.

It is a block of statements that is executed irrespective if or if not an exception was caught in the preceding try block.

Finalize() This method is linked with garbage collection.

This method is invoked automatically, just before the collection of garbage value.

Casting between numeric types is used to convert larger values, like double values, to smaller values, such as byte values.