12.How can a programmer allow only certain methods in a class to be overridden,

Question

12.How can a programmer allow only certain methods in a class to be overridden, but not others?
13.If no exceptions are thrown in a try block, where does control proceed to when the try block completes execution?
14.Should a conventional application catch Error objects? Explain.
15.What is the key reason for using the finally block?
16.State whether the following exceptions are checked or unchecked exceptions. (Hint: You will need to know the inheritance hierarchy of each of these exception classes: its superclass, its superclass’s superclass, etc. This can be found near the top of the Javadoc documentation for each class. Google should return the Javadoc of the class as the first result when you search for java 9 javadoc className, replacing className with the exception’s name.)
java.lang.ArithmeticException java.lang.ClassNotFoundException java.io.IOException java.lang.NumberFormatException java.sql.SQLException

17.Which class contains the format method for writing to a text file?
18.Which class can be used to retrieve Strings, numeric primitives, or full lines of text from a text file?
19.Which interface must a class implement in order for its objects to be serialized?
20.Which class contains the writeObject method for serializing an object?
21.Which class contains the readObject method for deserializing an object? 12.How can a programmer allow only certain methods in a class to be overridden, but not others?
13.If no exceptions are thrown in a try block, where does control proceed to when the try block completes execution?
14.Should a conventional application catch Error objects? Explain.
15.What is the key reason for using the finally block?
16.State whether the following exceptions are checked or unchecked exceptions. (Hint: You will need to know the inheritance hierarchy of each of these exception classes: its superclass, its superclass’s superclass, etc. This can be found near the top of the Javadoc documentation for each class. Google should return the Javadoc of the class as the first result when you search for java 9 javadoc className, replacing className with the exception’s name.)
java.lang.ArithmeticException java.lang.ClassNotFoundException java.io.IOException java.lang.NumberFormatException java.sql.SQLException

17.Which class contains the format method for writing to a text file?
18.Which class can be used to retrieve Strings, numeric primitives, or full lines of text from a text file?
19.Which interface must a class implement in order for its objects to be serialized?
20.Which class contains the writeObject method for serializing an object?
21.Which class contains the readObject method for deserializing an object? 12.How can a programmer allow only certain methods in a class to be overridden, but not others?
13.If no exceptions are thrown in a try block, where does control proceed to when the try block completes execution?
14.Should a conventional application catch Error objects? Explain.
15.What is the key reason for using the finally block?
16.State whether the following exceptions are checked or unchecked exceptions. (Hint: You will need to know the inheritance hierarchy of each of these exception classes: its superclass, its superclass’s superclass, etc. This can be found near the top of the Javadoc documentation for each class. Google should return the Javadoc of the class as the first result when you search for java 9 javadoc className, replacing className with the exception’s name.)
java.lang.ArithmeticException java.lang.ClassNotFoundException java.io.IOException java.lang.NumberFormatException java.sql.SQLException

17.Which class contains the format method for writing to a text file?
18.Which class can be used to retrieve Strings, numeric primitives, or full lines of text from a text file?
19.Which interface must a class implement in order for its objects to be serialized?
20.Which class contains the writeObject method for serializing an object?
21.Which class contains the readObject method for deserializing an object?

Explanation / Answer

13.If no exceptions are thrown in a try block, where does control proceed to when the try block completes execution?

Answer:

The catch blocks for that try statement are skipped, and the program resumes execution after the last catch block. If there's a finally block, it's executed first; then the program resumes execution after the finally block.

14.Should a conventional application catch Error objects? Explain.

Answer:

Errors are usually serious problems with the underlying Java system; most programs will not want to catch Errors because they will not be able to recover from them.

15)What is the key reason for using the finally block?

Answer:

The finally block is the preferred means for releasing resources to prevent resource leaks.

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