📘 ❞ Interview Questions in Core Java ❝ مذكّرة

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█ _ 0 حصريا مذكّرة ❞ Interview Questions in Core Java ❝ 2024 Java: Java 1 what is a transient variable? A variable that may not be serialized 2 which containers use border Layout as their default layout? The window, Frame and Dialog classes layout 3 Why do threads block on I O? Threads i o (that enters the waiting state) so other execute while i o Operation performed 4 How are Observer Observable used? Objects subclass class maintain list of observers When an object is updated it invokes update() method each its to notify has changed state The interface implemented by objects observe 5 What synchronization why important? With respect multithreading, capability control access multiple to shared resources Without synchronization, possible for one thread modify shared while another process using or updating object's value This often leads significant errors 6 Can lock acquired class? Yes, can class's Class 7 What's new with stop(), suspend() resume() methods JDK 1 2? The have been deprecated 2 8 Is null keyword? The keyword 9 preferred size component? The component minimum will allow display normally 10 used specify container's setLayout () 11 Which FlowLayout Panel Applet 12 state does enter when terminates processing? When processing, dead 13 is Collections API? The API set interfaces support operations collections 14 characters second character identifier, but first character identifier? The digits through 9 first identifier they after the first 15 List interface? كتب جافا مجاناً PDF اونلاين هي لغة برمجة كائنية التوجه ابتكرها جيمس غوسلينغ عام 1992م أثناء عمله مختبرات شركة صن ميكروسيستمز وذلك لاستخدامها بمثابة العقل المفكر المستخدم لتشغيل أجهزة التطبيقات الذكية مثل التليفزيون التفاعلي وقد كانت الجافا تطويرًا للغة سي ++ وعند ولادتها أطلق عليها مبتكرها "أواك" بمعنى شجرة السنديان؛ وهي الشجرة التي كان يراها من نافذة مكتبه وهو يعمل ثم تغير الاسم إلى وهذا (على غير العادة تسمية لغات البرمجة) ليس الحروف الأولى كلمات جملة معينة أو تعبيرًا معين ولكنه مجرد اسم وضعه مطورو هذه اللغة لينافس الأسماء الأخرى

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Interview Questions in Core Java

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Interview Questions in Core Java

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عن مذكّرة Interview Questions in Core Java:
Interview Questions in Core Java
1.what is a transient variable?
A transient variable is a variable that may not be serialized.
2.which containers use a border Layout as their default layout?
The window, Frame and Dialog classes use a border layout as their default layout.
3.Why do threads block on I/O?
Threads block on
i/o (that is enters the waiting state) so that other threads may execute while the i/o
Operation is performed.

4. How are Observer and Observable used?

Objects that subclass the Observable class maintain a list of observers. When an Observable object is
updated it invokes the
update() method of each of its observers to notify the observers that it has changed
state. The Observer interface is implemented by objects that observe Observable objects.

5. What is synchronization and why is it important?

With respect to multithreading, synchronization is the capability to control the access of multiple threads to
shared resources. Without synchronization, it is possible for one thread to modify a shared object while
another thread is in the process of using or updating that object's value. This often leads to significant
errors.

6. Can a lock be acquired on a class?

Yes, a lock can be acquired on a class. This lock is acquired on the class's Class object.

7. What's new with the

stop(), suspend() and resume() methods in JDK 1.2?
The
stop(), suspend() and resume() methods have been deprecated in JDK 1.2.

8. Is null a keyword?

The null value is not a keyword.

9. What is the preferred size of a component?

The preferred size of a component is the minimum component size that will allow the component to display
normally.

10. What method is used to specify a container's layout?

The
setLayout
() method is used to specify a container's layout.

11. Which containers use a

FlowLayout as their default layout?
The Panel and Applet classes use the
FlowLayout as their default layout.

12. What state does a thread enter when it terminates its processing?

When a thread terminates its processing, it enters the dead state.

13. What

is the Collections API?
The Collections API is a set of classes and interfaces that support operations on collections of objects.

14. Which characters may be used as the second character of an identifier, but not as the first

character of an identifier?
The digits 0 through 9 may not be used as the first character of an identifier but they may be used after the
first character of an identifier.

15. What is the List interface?

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