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a)
Abstract class:
An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.
Legal abstract class:
The conditions for a class to be considered as legal abstract class are mentioned below:
- If a class includes abstract methods, then the class must be declared as abstract.
- The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.
Interface:
Interface is a reference type in Java, which contains a collection of abstract methods.
An interface needs to the follow certain conditions such as:
- One cannot instantiate an interface.
- Interfaces do not contain any constructors.
- All methods present in the interface are abstracts.
- An interface does not contain any instance field.
- An interface cannot be extended by a class.
b)
Abstract class:
An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.
Legal abstract class:
The conditions for a class to be considered as legal abstract class are mentioned below:
- If a class includes abstract methods, then the class must be declared as abstract.
- The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.
Interface:
Interface is a reference type in Java, which contains a collection of abstract methods.
An interface needs to the follow certain conditions such as:
- One cannot instantiate an interface.
- Interfaces do not contain any constructors.
- All methods present in the interface are abstracts.
- An interface does not contain any instance field.
- An interface cannot be extended by a class.
c)
Abstract class:
An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.
Legal abstract class:
The conditions for a class to be considered as legal abstract class are mentioned below:
- If a class includes abstract methods, then the class must be declared as abstract.
- The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.
Interface:
Interface is a reference type in Java, which contains a collection of abstract methods.
An interface needs to the follow certain conditions such as:
- One cannot instantiate an interface.
- Interfaces do not contain any constructors.
- All methods present in the interface are abstracts.
- An interface does not contain any instance field.
- An interface cannot be extended by a class.
d)
Abstract class:
An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.
Legal abstract class:
The conditions for a class to be considered as legal abstract class are mentioned below:
- If a class includes abstract methods, then the class must be declared as abstract.
- The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.
Interface:
Interface is a reference type in Java, which contains a collection of abstract methods.
An interface needs to the follow certain conditions such as:
- One cannot instantiate an interface.
- Interfaces do not contain any constructors.
- All methods present in the interface are abstracts.
- An interface does not contain any instance field.
- An interface cannot be extended by a class.
e)
Abstract class:
An abstract class is a class which may or may not include abstract methods and cannot be instantiated but rather can be sub classed.
Legal abstract class:
The conditions for a class to be considered as legal abstract class are mentioned below:
- If a class includes abstract methods, then the class must be declared as abstract.
- The abstract method that is declared within the abstract class must be declared without braces and followed by a semicolon.
Interface:
Interface is a reference type in Java, which contains a collection of abstract methods.
An interface needs to the follow certain conditions such as:
- One cannot instantiate an interface.
- Interfaces do not contain any constructors.
- All methods present in the interface are abstracts.
- An interface does not contain any instance field.
- An interface cannot be extended by a class.
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Chapter 13 Solutions
Introduction to Java Programming and Data Structures Comprehensive Version (11th Edition)
- 6. See the code below and solve the following. import java.io.*; public class DataStream { } public static void main(String[] args) } DataOutputStream output = new DataOutputStream(new FileOutputStream("temp.dat")); output.writeUTF("Book1"); output.writeInt(85); output.writeUTF("Book2"); output.writeInt(125); output.writeUTF("Book3"); output.writeInt(70); output.close(); // ToDo: Read all data from temp.dat and print the data to the standard output (monitor) 6-1. This program has a compile error, and the message is “Unhandled exception type FileNotFoundException". How do you fix this error? (1 point) 6-2. Is FileNotFoundException a checked exception or an unchecked exception? (1 point) 6-3. What is the difference between checked exception and unchecked exception? (1 point) 6-4. Please complete the above program by reading all data from temp.dat and print the data to the standard output (monitor) by using System.out.print, System.out.println or System.out.printf method. (2 points)arrow_forwardWrite a program that reads a list of integers from input and determines if the list is a palindrome (values are identical from first to last and last to first). The input begins with an integer indicating the length of the list that follows. Assume the list will contain a maximum of 20 integers. Output "yes" if the list is a palindrome and "no" otherwise. The output ends with a newline. Hints: - use a for loop to populate the array based on the specified size (the first number entered) - use a for loop to check first value with last value, second value with second from end, etc. - if the values do not match, set a Boolean variable to flag which statement to output (yes or no) Ex: If the input is (remember to include spaces between the numbers): 6 1 5 9 9 5 1 the output is: yes Ex: If the input is: 5 1 2 3 4 5 the output is: C++ codingarrow_forwardDesign and draw a high-level "as-is" process diagram that illustrates a current process related to a product or service offered through the SSDCI.gov database.arrow_forward
- Microsoft Visual C#Computer ScienceISBN:9781337102100Author:Joyce, Farrell.Publisher:Cengage Learning,EBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENTProgramming Logic & Design ComprehensiveComputer ScienceISBN:9781337669405Author:FARRELLPublisher:Cengage
- C++ for Engineers and ScientistsComputer ScienceISBN:9781133187844Author:Bronson, Gary J.Publisher:Course Technology PtrC++ Programming: From Problem Analysis to Program...Computer ScienceISBN:9781337102087Author:D. S. MalikPublisher:Cengage LearningEBK JAVA PROGRAMMINGComputer ScienceISBN:9781305480537Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT
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