program requires 2 java files, the testing program should use a switch 9. The Speed of SoundThe following table shows the approximate speed of sound in air, water, and steel:MediumSpeedAir1,100 feet per secondWater4,900 feet per secondSteel16,400 feet per secondDesign a class that stores in a distance field the distance, in feet, traveled by a sound wave.The class should have the appropriate accessor and mutator methods for this field. In addi-tion, the class should have the following methods:• getSpeedInAir. This method should return the number of seconds it would take asound wave to travel, in air, the distance stored in the distance field. The formulato calculate the amount of time it will take the sound wave to travel the specifieddistance in air is:Time = distance/1100• getSpeedInWater. This method should return the number of seconds it would take asound wave to travel, in water, the distance stored in the distance field. The formulato calculate the amount of time it will take the sound wave to travel the specifieddistance in water is:Time = distance/4900• getSpeedInSteel. This method should return the number of seconds it would take asound wave to travel, in steel, the distance stored in the distance field. The formulato calculate the amount of time it will take the sound wave to travel the specifieddistance in air is:Time = distance/16400Write a program to demonstrate the class. The program should display a menu allowing theuser to select air, water, or steel. Once the user has made a selection, he or she should beasked to enter the distance a sound wave will travel in the selected medium. Thewill then display the amount of time it will take. Check that the user has selected one ofthe available choices from the menu.programling Roints

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Database System Concepts

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

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program requires 2 java files, the testing program should use a switch

9. The Speed of Sound
The following table shows the approximate speed of sound in air, water, and steel:
Medium
Speed
Air
1,100 feet per second
Water
4,900 feet per second
Steel
16,400 feet per second
Design a class that stores in a distance field the distance, in feet, traveled by a sound wave.
The class should have the appropriate accessor and mutator methods for this field. In addi-
tion, the class should have the following methods:
• getSpeedInAir. This method should return the number of seconds it would take a
sound wave to travel, in air, the distance stored in the distance field. The formula
to calculate the amount of time it will take the sound wave to travel the specified
distance in air is:
Time = distance/1100
• getSpeedInWater. This method should return the number of seconds it would take a
sound wave to travel, in water, the distance stored in the distance field. The formula
to calculate the amount of time it will take the sound wave to travel the specified
distance in water is:
Time = distance/4900
• getSpeedInSteel. This method should return the number of seconds it would take a
sound wave to travel, in steel, the distance stored in the distance field. The formula
to calculate the amount of time it will take the sound wave to travel the specified
distance in air is:
Time = distance/16400
Write a program to demonstrate the class. The program should display a menu allowing the
user to select air, water, or steel. Once the user has made a selection, he or she should be
asked to enter the distance a sound wave will travel in the selected medium. The
will then display the amount of time it will take. Check that the user has selected one of
the available choices from the menu.
program
ling Roints

Expert Solution

switch

The switch statement allows us to execute a block of code among many alternatives.

switch (expression) {
  case value1:
    // code to be executed if
    // expression is equal to value1
    break;
  
  case value2:
    // code to be executed if
    // expression is equal to value2
    break;
  
  ...
  ...
  
  default:
    // default statements
  }

The expression is evaluated once and compared with the values of each case label.

If there is a match, the corresponding code after the matching case label is executed.

For example, if the value of the expression is equal to value2, the code after case value2: is executed.
If there is no match, the code after default: is executed.

Note: We can do the same functionality using the Java if...else...if ladder. However, the syntax of the switch statement is cleaner and much easier to read and write.

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