Write the method whatIsThisObject. whatIsThisObject accepts a single Object as a parameter, and outputs to the console based on what type of object is passed. Create a main program that tests whatIsThisObject for all the wrapper classes listed below. If a different kind of object is passed, the method should print “I don’t know what kind of object that was.” to the console. These wrapper classes are built into Java; you do not need to create them! ▪ Boolean ▪ Byte ▪ Character ▪ Integer ▪ Float ▪ Double ▪ Long ▪ Short A sample main (test) program and output follow. This program does not test all the required data types. You must supply your own initial values for test variables. You must test whatIsThisObject with an object of type Exception and String in addition to the wrapper classes listed above. public static void main(String[] args) {Double nD = // Student inserts literal value hereInteger nI = // Student inserts literal value hereFloat nF = // Student inserts literal value hereString nS =// Student inserts literal value herewhatIsThisObject(nD);whatIsThisObject(nI);whatIsThisObject(nF);whatIsThisObject(nS); } That was a Double. That was an Integer. That was a Float. I don't know what kind of object that was. Rubric: • whatIsThisObject works as described • Instantiate/test eight wrapper class objects plus an Exception and a String object • Program structure

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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Write the method whatIsThisObject. whatIsThisObject accepts a single Object as a parameter, and outputs to the console based on what type of object is passed. Create a main program that tests whatIsThisObject for all the wrapper classes listed below. If a different kind of object is passed, the method should print “I don’t know what kind of object that was.” to the console. These wrapper classes are built into Java; you do not need to create them! ▪ Boolean ▪ Byte ▪ Character ▪ Integer ▪ Float ▪ Double ▪ Long ▪ Short A sample main (test) program and output follow. This program does not test all the required data types. You must supply your own initial values for test variables. You must test whatIsThisObject with an object of type Exception and String in addition to the wrapper classes listed above. public static void main(String[] args) { Double nD = // Student inserts literal value here Integer nI = // Student inserts literal value here Float nF = // Student inserts literal value here String nS =// Student inserts literal value here whatIsThisObject(nD); whatIsThisObject(nI); whatIsThisObject(nF); whatIsThisObject(nS); } That was a Double. That was an Integer. That was a Float. I don't know what kind of object that was. Rubric: • whatIsThisObject works as described • Instantiate/test eight wrapper class objects plus an Exception and a String object • Program structure

Task 2. Polymorphism / instanceOf. (10 points)
Write the method whatIsThisObject. whatIsThisObject
accepts a single Object as a parameter, and outputs to the
console based on what type of object is passed. Create a
main program that tests whatIsThisObject for all the
wrapper classes listed below. If a different kind of object is
passed, the method should print “I don't know what kind of
object that was." to the console.
These wrapper classes are built into Java; you do not
need to create them!
· Boolean
· Byte
· Character
· Integer
· Float
· Double
• Long
· Short
A sample main (test) program and output follow. This
program does not test all the required data types. You
must supply your own initial values for test variables.
You must test whatIsThisObject with an object of type
Exception and String in addition to the wrapper classes
listed above.
public static void main(String|] args) {
Double nD =
Integer nl =
Float nF =
String nS =
I/ Student inserts literal value here
// Student inserts literal value here
// Student inserts literal value here
I/ Student inserts literal value here
whatIsThisObject(nD);
whatlsThisObject(nl);
whatlsThisObject(nF);
whatlsThisObject(nS);
}
That was a Double.
That was an Integer.
That was a Float.
I don't know what kind of object that was.
· Rubric:
• Student name and today's date is a comment in the first
line of the programs: -5 points if fails
• whatIsThisObject works as described: 4 points
• Instantiate/test eight wrapper class objects plus an
Exception and a String object: 4 points
• Program structure: 2 points

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