INTERVIEW QUESTIONS J2EE CORE JAVA DETAILS

Question: How to define an Abstract class?

Answer: A class containing abstract method is called Abstract class. An Abstract class can't be instantiated.

Example of Abstract class:
abstract class testAbstractClass {
protected String myString;
public String getMyString() {
return myString;
}
public abstract string anyAbstractFunction();
}

A class containing abstract method is called Abstract class. An Abstract class can't be instantiated.

Example of Abstract class:
abstract class testAbstractClass {
protected String myString;
public String getMyString() {
return myString;
}
public abstract string anyAbstractFunction();
} Source: CoolInterview.com

A class that declares as abstract is called as abstract class. we can have an abstract class with no abstract mothods also. Source: CoolInterview.com

a class is called a abstract if it contain abstract methid and also if class implement any interface and it not implement(not write signature or body of any method) then it called abstract,and in this case the instance of class is not created,and if we not write abstract modifer above the class it give a compile time error,
also if class is not abstract then we can also write a abstract modifer and it not give any error but it has no sense Source: CoolInterview.com

A class that declares as abstract is called as abstract class. we can have an abstract class with no abstract methods also

Best Example:
public abstract class javax/servlet/http/HttpServlet Source: CoolInterview.com

Any class that contains one or more abstract methods must also be declared abstract. To declare a class abstract, you simply use the abstract keyword in front of the class keyword at the beginning of the class declaration. There can be no objects of an abstract class. Source: CoolInterview.com

Abstract is a keyword.It is used to declare class and method. Abstract class contain at least one abstract method and simple method also. Source: CoolInterview.com

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