Answered: I know the gudelines says to solve 3…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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I know the gudelines says to solve 3 Multiple Choice at a time but as I do not have any more questions please solve one more multiple choice so I don't have to use another question.

7.) What exception type does the following program throw?

public class Test {
public static void main(String[] args) {
String s = "abc";
System.out.println(s.charAt(3));
}
}
a. ArithmeticException
b. ArrayIndexOutOfBoundsException
c. StringIndexOutOfBoundsException
d. ClassCastException
e. No exception

8.) A method must declare to throw ________.
a. unchecked exceptions
b. checked exceptions
c. Error
d. RuntimeException

9.) Which class contains the method for checking whether a file exists?
a. File
b. PrintWriter
c. Scanner
d. System

10.) Which method can be used to create an input object for file temp.txt?
a. new Scanner("temp.txt")
b.new Scanner(temp.txt)

c. new Scanner(new File("temp.txt"))

d. new Scanner(File("temp.txt"))

Expert Solution

Question 7

ArithmeticException occurs when an attempt is made to divide a number by zero.

ArrayIndexOutOfBoundsException occurs when the index is either negative or greater than or equal to the size of the array.

StringIndexOutOfBoundsException is thrown by string methods when the index is either negative or greater than or equal to the size of the array.

ClassCastException occurs when we try to improperly cast a class from one type to another.

In the above program, a string with length 3 is created. The indexing of the characters, therefore, will go on from 0 to 2.

Therefore, statement s.charAt(3) will throw StringIndexOutOfBoundsException.

Correct Option: #c

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