Huawei Most Frequently Asked Latest Advanced Java Interview Questions Answers
How Are This And Super Used?
this is used to refer to the current object instance.
super is used to refer to the variables and methods of the superclass of the current object instance.
What Is A Compilation Unit?
A compilation unit is a Java source code file.
What Interface Is Extended By Awt Event Listeners?
All AWT event listeners extend the java.util.EventListener interface.
What Restrictions Are Placed On Method Overriding?
Overridden methods must have the same name, argument list, and return type.
The overriding method may not limit the access of the method it overrides.
The overriding method may not throw any exceptions that may not be thrown by the overridden method.
How Can A Dead Thread Be Restarted?
A dead thread cannot be restarted.
What Happens If An Exception Is Not Caught?
An uncaught exception results in the uncaughtException() method of the thread's ThreadGroup being invoked, which eventually results in the termination of the program in which it is thrown.
What Is A Layout Manager?:A layout manager is an object that is used to organize components in a container.
Which Arithmetic Operations Can Result In The Throwing Of An Arithmeticexception?
Integer / and % can result in the throwing of an ArithmeticException.
What Are Three Ways In Which A Thread Can Enter The Waiting State?
A thread can enter the waiting state by invoking its sleep() method, by blocking on I/O, by unsuccessfully attempting to acquire an object's lock, or by invoking an object's wait() method. It can also enter the waiting state by invoking its (deprecated) suspend() method.
Can An Abstract Class Be Final?
An abstract class may not be declared as final.
What Is The Resourcebundle Class?
The ResourceBundle class is used to store locale-specific resources that can be loaded by a program to tailor the program's appearance to the particular locale in which it is being run.
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?
The exception propagates up to the next higher level try-catch statement (if any) or results in the program's termination.
What Is Numeric Promotion?
Numeric promotion is the conversion of a smaller numeric type to a larger numeric type, so that integer and floating-point operations may take place. In numerical promotion, byte, char, and short values are converted to int values. The int values are also converted to long values, if necessary. The long and float values are converted to double values, as required.
What Is The Difference Between A Scrollbar And A Scrollpane?
A Scrollbar is a Component, but not a Container. A ScrollPane is a Container.
A ScrollPane handles its own events and performs its own scrolling.
What Is The Difference Between A Public And A Non-public Class?
A public class may be accessed outside of its package.
A non-public class may not be accessed outside of its package.
To What Value Is A Variable Of The Boolean Type Automatically Initialized?
The default value of the boolean type is false.
Can Try Statements Be Nested?
Try statements may be tested.
What Is The Difference Between The Prefix And Postfix Forms Of The ++ Operator?
The prefix form performs the increment operation and returns the value of the increment operation.
The postfix form returns the current value all of the expression and then performs the increment operation on that value.
What Is The Purpose Of A Statement Block?
A statement block is used to organize a sequence of statements as a single statement group.
What Is A Java Package And How Is It Used?
A Java package is a naming context for classes and interfaces. A package is used to create a separate name space for groups of classes and interfaces.
Packages are also used to organize related classes and interfaces into a single API unit and to control accessibility to these classes and interfaces.
What Modifiers May Be Used With A Top-level Class?
A top-level class may be public, abstract, or final.
What Are The Object And Class Classes Used For?
The Object class is the highest-level class in the Java class hierarchy. The Class class is used to represent the classes and interfaces that are loaded by a Java program..
How Does A Try Statement Determine Which Catch Clause Should Be Used To Handle An Exception?
When an exception is thrown within the body of a try statement, the catch clauses of the try statement are examined in the order in which they appear. The first catch clause that is capable of handling the exception is executed. The remaining catch clauses are ignored.
What Is The Difference Between Topic And Queue?
A topic is typically used for one to many messaging i.e. it supports publish subscribe model of messaging. While queue is used for one-to-one messaging i.e. it supports Point to Point Messaging.
What Is The Log That Has To Seen To Check For An Error In Ruby Rails?
Rails will report errors from Apache in log/apache.log and errors from the Ruby code in log/development.log. If you're having a problem, do have a look at what these logs are saying. On Unix and Mac OS X you may run tail -f log/development.log in a separate terminal to monitor your application's execution.
What Is The Scope Of A Local Variable In Ruby?
A new scope for a local variable is introduced in the toplevel, a class (module) definition, a method defintion. In a procedure block a new scope is introduced but you can access to a local variable outside the block.
The scope in a block is special because a local variable should be localized in Thread and Proc objects. while, until, and for are control structures and the scope is shared with the outside of these structures. loop is a method and the appended block introduces a new scope.
What Is The Use Of Global Variable $ In Ruby?
If you declare one variable as global we can access any where, as class variable.
How Are This And Super Used?
this is used to refer to the current object instance.
super is used to refer to the variables and methods of the superclass of the current object instance.
What Is A Compilation Unit?
A compilation unit is a Java source code file.
What Interface Is Extended By Awt Event Listeners?
All AWT event listeners extend the java.util.EventListener interface.
What Restrictions Are Placed On Method Overriding?
Overridden methods must have the same name, argument list, and return type.
The overriding method may not limit the access of the method it overrides.
The overriding method may not throw any exceptions that may not be thrown by the overridden method.
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| Huawei Most Frequently Asked Latest Advanced Java Interview Questions Answers |
How Can A Dead Thread Be Restarted?
A dead thread cannot be restarted.
What Happens If An Exception Is Not Caught?
An uncaught exception results in the uncaughtException() method of the thread's ThreadGroup being invoked, which eventually results in the termination of the program in which it is thrown.
What Is A Layout Manager?:A layout manager is an object that is used to organize components in a container.
Which Arithmetic Operations Can Result In The Throwing Of An Arithmeticexception?
Integer / and % can result in the throwing of an ArithmeticException.
What Are Three Ways In Which A Thread Can Enter The Waiting State?
A thread can enter the waiting state by invoking its sleep() method, by blocking on I/O, by unsuccessfully attempting to acquire an object's lock, or by invoking an object's wait() method. It can also enter the waiting state by invoking its (deprecated) suspend() method.
Can An Abstract Class Be Final?
An abstract class may not be declared as final.
What Is The Resourcebundle Class?
The ResourceBundle class is used to store locale-specific resources that can be loaded by a program to tailor the program's appearance to the particular locale in which it is being run.
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?
The exception propagates up to the next higher level try-catch statement (if any) or results in the program's termination.
What Is Numeric Promotion?
Numeric promotion is the conversion of a smaller numeric type to a larger numeric type, so that integer and floating-point operations may take place. In numerical promotion, byte, char, and short values are converted to int values. The int values are also converted to long values, if necessary. The long and float values are converted to double values, as required.
What Is The Difference Between A Scrollbar And A Scrollpane?
A Scrollbar is a Component, but not a Container. A ScrollPane is a Container.
A ScrollPane handles its own events and performs its own scrolling.
What Is The Difference Between A Public And A Non-public Class?
A public class may be accessed outside of its package.
A non-public class may not be accessed outside of its package.
To What Value Is A Variable Of The Boolean Type Automatically Initialized?
The default value of the boolean type is false.
Can Try Statements Be Nested?
Try statements may be tested.
What Is The Difference Between The Prefix And Postfix Forms Of The ++ Operator?
The prefix form performs the increment operation and returns the value of the increment operation.
The postfix form returns the current value all of the expression and then performs the increment operation on that value.
What Is The Purpose Of A Statement Block?
A statement block is used to organize a sequence of statements as a single statement group.
What Is A Java Package And How Is It Used?
A Java package is a naming context for classes and interfaces. A package is used to create a separate name space for groups of classes and interfaces.
Packages are also used to organize related classes and interfaces into a single API unit and to control accessibility to these classes and interfaces.
What Modifiers May Be Used With A Top-level Class?
A top-level class may be public, abstract, or final.
What Are The Object And Class Classes Used For?
The Object class is the highest-level class in the Java class hierarchy. The Class class is used to represent the classes and interfaces that are loaded by a Java program..
How Does A Try Statement Determine Which Catch Clause Should Be Used To Handle An Exception?
When an exception is thrown within the body of a try statement, the catch clauses of the try statement are examined in the order in which they appear. The first catch clause that is capable of handling the exception is executed. The remaining catch clauses are ignored.
What Is The Difference Between Topic And Queue?
A topic is typically used for one to many messaging i.e. it supports publish subscribe model of messaging. While queue is used for one-to-one messaging i.e. it supports Point to Point Messaging.
What Is The Log That Has To Seen To Check For An Error In Ruby Rails?
Rails will report errors from Apache in log/apache.log and errors from the Ruby code in log/development.log. If you're having a problem, do have a look at what these logs are saying. On Unix and Mac OS X you may run tail -f log/development.log in a separate terminal to monitor your application's execution.
What Is The Scope Of A Local Variable In Ruby?
A new scope for a local variable is introduced in the toplevel, a class (module) definition, a method defintion. In a procedure block a new scope is introduced but you can access to a local variable outside the block.
The scope in a block is special because a local variable should be localized in Thread and Proc objects. while, until, and for are control structures and the scope is shared with the outside of these structures. loop is a method and the appended block introduces a new scope.
What Is The Use Of Global Variable $ In Ruby?
If you declare one variable as global we can access any where, as class variable.
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