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Automatic garbage collection is one of the most highly touted conveniences of Aruk. Typical M V C architecture is show n above. What is a Values Collection View? HashSet and TreeSet are implementations of a Set interface. When providing a user defined key class for storing objects in the HashMaps or Hashtables, what methods do you have to provide or override i.

It delegates any look-andfeel aspect jva the component to the UI Manager. Why there are some interfaces with no defined methods i. Model multiple interface inheritance in Java, which provides some of the benefits of full on multiple inheritances, a feature that some object-oriented languages support that allow a class to have more than one superclass.

Interface inheritance can achieve code reuse with the help of jzva composition.

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Arulkumaran’s Books and Publications Spotlight

It gets it from the flyweight factory, which checks to see if it has a flyweight that fits a specific criteria e. A NullPointerException is thrown when calling the instance method of a null object, accessing or modifying the field of a null object etc. Another distinct advantage of using actions is that when an action is disabled then all the components, which use the Action, become disabled.

Super class Account has reusable code as methods deposit double amount and withdraw double amount. You can lock the entire list while iterating by wrapping your code within a synchronized block.

Yes, use this syntax. Inheritance can also be defined as the process whereby one object acquires characteristics from one or more other objects the same way children acquire characteristics arlu their parents. Favor object composition over inheritance. Design patterns have a number of advantages: The standard layout managers are: Define the system structure better. Immutability – when immutability is jumar wrapper implementations are provided for making a collection immutable. Know their product lines and their competitors.

Mechanical Engineer to Java freelancer in 2. J2EE architecture provides configurable and nonconfigurable services.

So what is the difference between a component and a service? Constructors Regular methods Constructors must have the same name as the class name and cannot return a value.

Arun Kumar _ Java 5_J2EE Interviews Questions and Answers

An applet is a Java program that runs in a Web browser. Specifying member variables as private can hide the variables and methods. Type casting means treating a variable of one type as though it is another type.

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No, this is not possible. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time. Give an overview of hibernate framework?

This can cause problems when aru instances of the car objects have the same color but the inherited equals will return false because it uses the memory location, which is different for Java – Fundamentals 37 the two instances. The Java platform has 2 components: Better naming convention is to have a meaningful name starting with a lowercase like: So, If a field is not used in equalsthen arjl must not be used in hashCode method.

Instance variables are variables within a class but outside any method.

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Java is a fun language. What are the supported platforms by Java Programming Language?

What is the difference between an applet and an application? An efficient way to do this is to declare a public static final Exception in your exception class itself. What do you mean by polymorphism, inheritance, encapsulation, and dynamic binding?

Which number is denoted by leading 0x or 0X in java?