Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
11th Edition
ISBN: 9780134670942
Author: Y. Daniel Liang
Publisher: PEARSON
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Concept explainers

Question
Chapter 12, Problem 12.1PE
Program Plan Intro

Program to throw the NumberFormatException exception

Program plan:

  • Import the required packages into the program.
    • Create a class Exercise12_01 to throw the NumberFormatException exception.
    • In the main() method,
      • Declare the required variables.
      • Check whether the length of argument is not equal to 3. If yes, display error message.
      • In try block, assign the first argument value to variable.
      • In catch block, catch the exception if error occurs.
      • In try block, assign the third argument value to variable.
      • In catch block, catch the exception if error occurs.
      • Match the argument 1 with character 0 using switch case.
        • If case "+" matches, then add the two numbers and stores the result.
        • If case "-" matches, then subtract the two numbers and stores the result.
        • If case "." matches, then multiply the two numbers and stores the result.
        • If case "/" matches, then divide the two numbers and stores the result.
      • Display the result.

Expert Solution & Answer
Check Mark
Program Description Answer

The below program demonstrates how to operate mathematical operations and throw a NumberFormatException exception if error occurs.

Explanation of Solution

Program:

Filename: Exercise12_01.java

//Class definition

public class Exercise12_01

{

//Main method

public static void main(String[] args)

{

//Declare and initialize variables

int num1, num2, result = 0;

/*Check whether the length of argument is not equal to 3. */

if (args.length != 3) {

//Display error message

System.out.println("please use java Exercise12_01 operand1 operator operand2");

//Exit the program

System.exit(1);

}

//In try block

try {

//Assign the argument 0 as "num1"

num1 = Integer.parseInt(args[0]);

}

//In catch block

catch (NumberFormatException ex) {

//Display the exception

System.out.println("Wrong Input: " + args[0]);

return;

}

//In try block

try {

//Assign the argument 2 as "num2"

num2 = Integer.parseInt(args[2]);

}

//In catch block

catch (Exception ex) {

//Display the exception

System.out.println("Wrong Input: " + args[2]);

return;

}

//Match the argument 1 with character 0

switch (args[1].charAt(0)) {

//If case "+" matches

case '+':

/*Add the num1 and num2 and stores the result */

result = num1 + num2;

//Break the program

break;

//If case "-" matches

case '-':

/*Subtract the num2 from num1 and stores the result. *

result = num1 - num2;

;

//Break the program

break;

//If case "." matches

case '.':

/*Multiply the num1 with num2 and stores the result */

result = num1 * num2;

;

//Break the program

break;

//If case "/" matches

case '/':

/*Divide the num1 by num2 and stores the result */

result = num1 / num2;

;

}

//Display the calculated result

System.out.println(args[0] + " " + args[1] + " " + args[2] + " = " + result);

}

}

Sample Output

Command to run the program:

java Exercise12_01 4 + 5

4 + 5 = 9

Additional Output:

java Exercise12_01 4 - 5

4 – 5 = -1

java Exercise12_01 4x - 5

Wrong Input: 4x

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In a few well-written paragraphs, discuss the use of exceptions and exception handling in programming. Your discussion should include definitions for exception, exception handler, throw signal, and catch process. Discuss why exceptions are helpful for handling runtime errors, such as division by zero.
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Is this statement true or false? PYHTHON!! Exceptions are errors that create an Exception object and continue running the program.

Chapter 12 Solutions

Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)

Ch. 12.4 - Prob. 12.4.3CPCh. 12.4 - Prob. 12.4.4CPCh. 12.4 - Prob. 12.4.5CPCh. 12.4 - Prob. 12.4.6CPCh. 12.4 - What is displayed when running the following...Ch. 12.4 - Prob. 12.4.8CPCh. 12.4 - What does the method getMessage() do?Ch. 12.4 - What does the method printStackTrace() do?Ch. 12.4 - Prob. 12.4.11CPCh. 12.4 - Prob. 12.4.12CPCh. 12.5 - Prob. 12.5.1CPCh. 12.6 - Prob. 12.6.1CPCh. 12.7 - Prob. 12.7.1CPCh. 12.8 - Prob. 12.8.1CPCh. 12.9 - Prob. 12.9.1CPCh. 12.9 - Prob. 12.9.2CPCh. 12.10 - What is wrong about creating a File object using...Ch. 12.10 - How do you check whether a file already exists?...Ch. 12.10 - Can you use the File class for I/O? Does creating...Ch. 12.11 - Prob. 12.11.1CPCh. 12.11 - Prob. 12.11.2CPCh. 12.11 - Prob. 12.11.3CPCh. 12.11 - Prob. 12.11.4CPCh. 12.11 - What will happen if you attempt to create a...Ch. 12.11 - Prob. 12.11.6CPCh. 12.11 - Suppose you enter 45 57, 8 789, then press the...Ch. 12.11 - Prob. 12.11.8CPCh. 12.12 - How do you create a Scanner object for reading...Ch. 12.13 - Prob. 12.13.1CPCh. 12.13 - Simplify the code in lines 20-28 as follows: 1....Ch. 12 - Prob. 12.1PECh. 12 - (InputMismatchException) Write a program that...Ch. 12 - (ArrayIndexOutOfBoundsException) Write a program...Ch. 12 - (IllegalArgumentException) Modify the Loan class...Ch. 12 - (IllegalTriangleException) Programming Exercise...Ch. 12 - (NumberFormatException) Listing 6.8 implements the...Ch. 12 - Prob. 12.7PECh. 12 - Prob. 12.8PECh. 12 - Prob. 12.9PECh. 12 - Prob. 12.10PECh. 12 - Prob. 12.11PECh. 12 - (Reformat Java source code) Write a program that...Ch. 12 - (Count characters, words, and lines in a file)...Ch. 12 - (Process scores in a text file) Suppose a text...Ch. 12 - (Write/read data) Write a program to create a file...Ch. 12 - Prob. 12.16PECh. 12 - (Game: hangman) Rewrite Programming Exercise 7.35....Ch. 12 - Prob. 12.18PECh. 12 - (Count words) Write a program that counts the...Ch. 12 - Prob. 12.20PECh. 12 - (Data sorted?) Write a program that reads the...Ch. 12 - Prob. 12.22PECh. 12 - (Process scores in a text file on the Web) Suppose...Ch. 12 - (Create large dataset) Create a data file with...Ch. 12 - (Create a directory) Write a program that prompts...Ch. 12 - Prob. 12.26PECh. 12 - (Replace words) Suppose you have a lot of files in...Ch. 12 - (Rename files) Suppose you have a lot of files in...Ch. 12 - (Rename files) Suppose you have several files in a...Ch. 12 - (Occurrences of each letter) Write a program that...Ch. 12 - (Baby name popularity ranking) The popularity...Ch. 12 - (Ranking summary) Write a program that uses the...
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