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A class can be a subclass of another class, not of itself.
A class can be a subclass of another class, not of itself.
A class can be a subclass of another class, not of itself.
A class can be a subclass of another class, not of itself.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoA class can be a subclass of another class, not of itself.
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How an exception subclass is created in java explain?
We can create a exception sub class by extending Exception class available in java
The Java keyword is used to declare a class as a subclass of another class?
class MyClass extends AnotherClass {}
In java why method defined in super class need not to defined in subclass?
In Java, or in any object oriented language such as C++, a method defined in super (parent) class does not need to be defined in a subclass, because that is the primary purpose of inheritance. Object oriented programming allows you to define and declare a class that implements the behavior for an object. Inheritance allows you to refine, or subclass, that class by "reusing" all of the functionality of the parent class into the sub class, adding additional definition and declaration for the sub class. If the subclass needs to change a parent class method, it can overload that method. This is called abstraction.
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.
It is an error to have a method with the same signature in both the super class and its subclass. True or false?
False. A method with the same signature in both the superclass and its subclass is known as method overriding, and is a valid concept in Java.
In Java is a class a subclass of itself?
No.
How an exception subclass is created in java explain?
We can create a exception sub class by extending Exception class available in java
The Java keyword is used to declare a class as a subclass of another class?
class MyClass extends AnotherClass {}
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.
In java why method defined in super class need not to defined in subclass?
In Java, or in any object oriented language such as C++, a method defined in super (parent) class does not need to be defined in a subclass, because that is the primary purpose of inheritance. Object oriented programming allows you to define and declare a class that implements the behavior for an object. Inheritance allows you to refine, or subclass, that class by "reusing" all of the functionality of the parent class into the sub class, adding additional definition and declaration for the sub class. If the subclass needs to change a parent class method, it can overload that method. This is called abstraction.
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.
It is an error to have a method with the same signature in both the super class and its subclass. True or false?
False. A method with the same signature in both the superclass and its subclass is known as method overriding, and is a valid concept in Java.
Can you call an abstract method from a non abstract method in java?
We can't call (i.e, execute) an abstract method in java because these methods don't contain any code to execute!In some special cases like when an abstract method is overridden in a subclass, and when we are using super class reference variable( which is referring that subclass object), it appears that we are calling abstract method in super class. But actually the code in the subclass method is being executed.Example:abstract class SuperClass{abstract void show(); //abstract method in super class}class SubClass extends SuperClass{void show(){ //show() of SuperClass overridden in SubClassSystem.out.println("SubClass Method");}}class Example{public static void main(String... args){SuperClass sup=new SubClass();sup.show(); //SubClass show() will be executed !!!}}
What is the use of the instanceof keyword in Java?
That is used to verify whether an object is based on the specified class (or a subclass).
What is sub class in Java?
A sub class is paired up with its super class. These can also be called a child and parent class.The subclass will inherit all of the variables and methods from its superclass. And one superclass can have multiple subclasses, but a subclass can only have one superclass.Here's an example:public class childName extends parentName {...}This means that childName will inherit everything from its superclass, which is parentName.The advantage of this inheritance is that you do not need to copy/paste lots of code for many similar subclasses, and if you want to change something you only need to make one change in the superclass.
How might one use the java subclass SimpleDateFormat?
One might use the Java subclass "SimpleDateFormat" when programming a Java application that needs to display the date. This would be then be used to show the user the current date in real time.
What is NumberFormatException in java?
NumberFormatException is a subclass of the RuntimeException class. An object of type NumberFormatException is thrown when an application attempts to convert a string (that does not represent a number) into a numeric type.
