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Interfaces are a way of imposing a type of functionality on all other java classes that are created using it. It is kind of a template that all child classes using this template must follow. All methods that are declared in an interface must be implemented by the child classes and hence the functionality offered by these classes can be controlled using them.
Interfaces are a powerful tool that java provides to achieve multiple inheritance.
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What is the minimum number of interfaces that a java class can have?
Zero. By default they do not implement any interfaces.
Need of interface in java?
Interfaces are used in Java to accomplish most of the goals of Multiple Inheritance. For several reasons, Java only supports Single Inheritance for classes - i.e. a class can have only a single parent. The use of Interfaces is how Java attempts to implement most of the positives of the concept of Multiple Inheritance while avoiding its pitfalls.
What is Abstract-Interface in java?
All interfaces are abstract.
What are the alternatives to inheritence in java?
Java does not support multiple inheritance; a subclass cannot have more than one parent. Java compensates for this with interfaces. A class can implement multiple interfaces, but can only extend one class.
Which one is more advanced core java or java?
The Core Java technologies and application programming interfaces (APIs) are the foundation of the Java Platform, Standard Edition (Java SE). They are used in all classes of Java programming, from desktop applications to Java EE applications. Well What exactly you mean by Java?
Give the structure of multiple inheritance?
Java does not support multiple inheritance. It is done with the help of interfaces in java. a class can implement n number of interfaces, thus showing multiple inheritance. but a class cannot extend multiple classes in java.
How can you write multiple inheritance program in java?
Java does not support direct multiple inheritance. You can implement partial multiple inheritance using interfaces. ex: public class ExMultInherit implements interface1, interface2, interface 3 { ... .... ...... }
What are swing components?
Swing Components are elements like a Frame, Button, Panel etc that can be used as part of Java Swings to create User Interfaces.
Can a single Java class subclass extend both InputStream and Reader. True or False?
Java does not have multiple inheritance, so no. Java can use multiple interfaces, though, with the "implements" keyword.
Difference between awt and java script?
AWT is a Java package for creating graphical user interfaces. JavaScript is a completely unrelated programming language.
When was the java virtual machine software created?
The Java platform, which consists 3 major parts: Java programming language, Java Virtual Machine (JVM), and several Java Application Programming Interfaces (APIs), was developed at Sun Microsystems in the early 1990s.
Interface is used in java but not in C why?
The short answer: because C is not object-oriented. The reason for C++ not having interfaces is, that C++ supports multiple inheritance. Because C++ classes can be derived from more than one base class, so there is no need to have interfaces. In Java, each class has exactly one base class (except the class Object). With the help of interfaces it is possible implement a restricted (and more stable) form of multiple inheritance. Interfaces follow implicitly the following rules: * interfaces are abstract * each method is public abstract * each attribute is public static final
