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What is the explanation for the different access modifiers in Java?
An Access Modifier is a key word in java that determines what level of access or visibility a particular java variable/method or class has. There are 4 basic access modifiers in java. They are:PublicProtectedUnspecified (package-private)PrivateClasses can only be declared public or left unspecified (the "package-private" default level). Methods can be declared any of the above.See the Link on the Java Tutorial for a very good explanation of the various levels of access each modifier provides.
What kind of constructs can be declared in a Java interface?
Constants and abstract methods. That's it.
What Java interface do you implement to provide methods that are called as an XML document is processed by a SAX parser?
ContentHandler
Can you define variables in interface in java?
yes we can define a variable in an interface in java.
Which methods are there in ActionListener interface?
The ActionListener interface has a single method.void actionPerformed(ActionEvent e) For full Java documentation see Oracle JavaDoc URL in related links below.
What is intrface in java?
interface is a list of methods which implements that interface
What is a tagging interface type?
A tagging interface type in Java is an interface that has not defined methods such as the java.io.Serializable interface.
What is interface in java?
Interface is collection of abstract methods which has only declaration and no implementation
What is the explanation for the different access modifiers in Java?
An Access Modifier is a key word in java that determines what level of access or visibility a particular java variable/method or class has. There are 4 basic access modifiers in java. They are:PublicProtectedUnspecified (package-private)PrivateClasses can only be declared public or left unspecified (the "package-private" default level). Methods can be declared any of the above.See the Link on the Java Tutorial for a very good explanation of the various levels of access each modifier provides.
What is difference between interface and abstract in java?
While an abstract class can define both abstract and non-abstract methods, an interface can have only abstract methods. Another way interfaces differ from abstract classes is that interfaces have very little flexibility in how the methods and variables defined in the interface are declared. These rules are strict: • All interface methods are implicitly public and abstract. In other words, you do not need to actually type the public or abstract modifiers in the method declaration, but the method is still always public and abstract. (You can use any kind of modifiers in the Abstract class) • All variables defined in an interface must be public, static, and final-in other words, interfaces can declare only constants, not instance variables. • Interface methods must not be static. • Because interface methods are abstract, they cannot be marked final, strictfp, or native. (More on these modifiers later.) • An interface can extend one or more other interfaces. • An interface cannot extend anything but another interface. • An interface cannot implement another interface or class. • An interface must be declared with the keyword interface. You must remember that all interface methods are public and abstract regardless of what you see in the interface definition.
What do mean by interface in java?
An interface in Java is like an abstract class, but there are no method bodies allowed in it and it has to be declared with the interface keyword. It is Java's way of getting around the Deadly Diamond of Death. Only abstract methods and constants are allowed in it.
What kind of constructs can be declared in a Java interface?
Constants and abstract methods. That's it.
What is the major difference between an Interface and a Class?
An interface can only have abstract methods or constants in it. A class can have both that and everything else in Java.
What Java interface do you implement to provide methods that are called as an XML document is processed by a SAX parser?
ContentHandler
What is meant by interface in java?
interface is just like a class. its contains abstract methods without any implementation and we cant create object for the class. we can only sub classed . used to achieved multiple inheritance in java.
In the field of computers what does the term java interface mean?
In Java, an interface is a suite of methods that multiple different classes are able to implement. Interfaces are not assigned to any particular class. For example, multiple graphics classes can use the same interface to change their size and colour.
Can you define variables in interface in java?
yes we can define a variable in an interface in java.
Can you create a constructor for an interface in java?
NO, we cannot create a contructor for an interface in java.
How can you write an interface name M and In the interface M place 2 methods named taste and smell both return String type in java program?
interface M { String taste(); String smell(); }
Which methods are there in ActionListener interface?
The ActionListener interface has a single method.void actionPerformed(ActionEvent e) For full Java documentation see Oracle JavaDoc URL in related links below.
What is exteranalizable in java?
Externalizable interface is a subclass of Serializable. Java provides Externalizable interface so as to give you more control over what is being serialized and what is not. Using this interface, you can Serialize only the fields of the class you want serialize and ignore the rest. This interface defines 2 methods: readExternal() and writeExternal() and you have to implement these methods in the class that will be serialized. In these methods you'll have to write code that reads/writes only the values of the attributes you are interested in. Programs that perform serialization and deserialization have to write and read these attributes in the same sequence
What is markable interface in java?
The Interface which doesn't have any declarations of methods are called the markable interface (or marker interface)They are named marker interfaces, because their only purpose is to mark special classes.Example:In the Java API there is the interface Cloneable. Since Object already has the method clone() the Cloneable Interface is empty and is only used to mark classes, which objects are allowed to clone.There are Three marker interfaces that are Serializable,Remote and Cloneable.
When you implement an interface method it should be declared as public in java?
This is not necessarily true. The only rules for this are that interface methods may not be private. They may be public, protected, or have the default (blank) access modifier.
What is class modifiers in java?
Class Modifiers are access modifiers that specify the accessibility levels of a class. There are 4 basic access modifiers in java. They are: 1. Public 2. Protected 3. Default and 4. Private Java programming does not run by just a single piece of class that has the whole functionality. You have hundreds of classes that interact with one another, passing data between them and returning output to the user of the system. So it is very important for members of one class to access members of another. Here members may refer to variables, methods and even classes. So, this is where the access modifiers come into picture. The modifier associated with every member of the class determines what level of visibility that member has.
What are two basic steps for event handling in java?
1.Implement the Listener interface and overrides its methods 2.Register the component with the Listener
