Question

IS 2031: LE 7.1 Lab Day DUE D M 4/22/19 Sections 001, 002, 003 Purpose: To learn how to create a class, instantiate an object of the class in another class, and use that object to call methods. Prop Work: Read chapter 7. Refer to coding created or reviewed in your IS 2033 class. Lab Exercise 7.1 Instructions: Name your program as YourLastNameFirstinitialLE71 java. From the code in LE 6.2, do the following: 1. You will NOT be changing any of the logic in the code for LE 6.2 2. Create a separate class called Invention. This class will have NO main(). 3. Insert a default constructor in the Invention class. This is a method that is empty and its header looks like this: public NameOfClass( 4. Code an overloaded constructor that will receive a student's name, when an object for Invention is created in the main(0 a. In the Invention class store the student's name in a field (global variable) called studentAuthor b. You will insert the student's name in the header of the output 5. Except, for the main), take all the other methods in LE 6.2 and put them in the Invention class. 6. Transfer the fields (class variables) from LE 6.2 to Invention. 7. Strip the word static from the fields and the method headers in the Invention class. 8. Cut and paste the main() from LE 6.2 into your program file for LE 7.1. a. Create an object of the Invention class. Format: NameOfClass objectName= new NameOfClass("NameOfStudent) b. Use that object for the method calls in the main(). i. i. Format: objectName.methodName) 9. Make sure both classes are in the same directory 10. To run both programs, you must run the class with the main(). Grading Reauirements: During lab class, enter your name on the sign-up sheet for grading when your assignment is in gradable condition.

Answer 1

[Note: Since LE 6.1 is not provided I have created the program according to my understanding]

Program

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Invention {
   //global variable
   private String studentAuthor;
   public Invention() {}//default constructor
   public Invention(String studentAuthor) {//overloaded parameterized constructor
       this.studentAuthor = studentAuthor;
   }
   public String getStudentAuthor() {//getter
       return studentAuthor;
   }
   public void setStudentAuthor(String studentAuthor) {//setter
       this.studentAuthor = studentAuthor;
   }
}
public class Test {
   public static void main(String[] args) throws IOException {
       //for taking console input
       BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
       //taking inputs
       int size;
       System.out.print("How many inventors? ");
       size = Integer.parseInt(br.readLine());
      
       int[] year = new int[size];
       String[] inventors = new String[size];
       String[] invention = new String[size];
       System.out.println();
       for(int i=0; i<size; i++) {//taking inventors input
           System.out.print("Enter inventor #"+(i+1)+": ");
           inventors[i] = br.readLine();
           System.out.println();
       }
       for(int i=0; i<size; i++) {//taking inventions input
           System.out.print("Enter "+inventors[i]+" invention: ");
           invention[i] = br.readLine();
           System.out.println();
       }
       for(int i=0; i<size; i++) {//taking years input
           System.out.print("Enter the years in which "+invention[i].toLowerCase()+" was invented: ");
           year[i] = Integer.parseInt(br.readLine());
           System.out.println();
       }
       //showing output
       Invention obj = new Invention("Sarah Farrow");//setting name of Student author
       System.out.println();
       System.out.println("FAMOUS INVENTIONS");
       System.out.println("Reported By: "+obj.getStudentAuthor());
       System.out.println();
       for(int i=0; i<size; i++) {
           System.out.println("Inventor: "+inventors[i]);
           System.out.println("Invention: "+invention[i]);
           System.out.println("Year Invented: "+year[i]);
           System.out.println();
       }
   }
}

Program Screenshot

Test.java 1 import java.io.BufferedReader 2 import java.io.IOException; 3 import java.io.InputstreamReader; 4. 5 class Invention f 6 global variable 7 private String studentAuthor; 8 public Invention) //default constructor 9 public Invention(String studentAuthor) //overloaded parameterized constructor 10 this.studentAuthor studentAuthor; 12 public String getStudentAuthor) (//getter 13 14 15 public void setStudentAuthor(String studentAuthor) (//setter 16 return studentAuthor; this.studentAuthor studentAuthor; 18 19 public class Test 20 public static void main(String[] args) throws IOException 21 //for taking console input BufferedReader br new BufferedReader(new InputStreamReader (System.in)); //taking inputs int size System.out.print ("How many inventors? "); sizeInteger.parseInt(br.readLine)); 23 24 25 26 int[] year new int[size]; Stringl] inventors new Stringlsize]; String[] invention-new Stringlsize]; System.out.println); for(int i-0; i<size; i+)//taking inventors input 28 29 30 31 32 System , out , print("Enter inventor inventors[i]br.readLine); System.out.println); #"+(1+1)+": "); 34 35 36 37 38 39 40 for(int 1-0; i<size; i++) (//taking inventions input System.out.print("Enter "+inventors[i]" invention: "; inventioni]br.readLine); System.out.println(); for(int i-0 i<size; i+) //taking years input System.out.print("Enter the years in which "+inventioni].toLowerCase)+" was invented:"; year[i] Integer.parseInt(br.readLine()) System.out.println); 45 46 47 48 49 50 51 52 53 //showing output Invention obj new Invention("Sarah Farrow");//setting name of Student author System.out.println); System , out . print In ("FAMOUS INVENTIONS"); System.out.println("Reported By: "+obj.getStudentAuthor()); System.out.println); for(int i-0; i<size; i+t) ( System.out.println( Inventor: " +inventors[i]) System.out.println( Invention: "+invention[i]); System.out.println("Year Invented "+year[i]); System.out.println); 56 57 58 59 60 Page 1

Output

<terminated> Test (1) [Java Application] CAProgram FilesJava\jre1.8.0_181\binljavaw.exe (22-Apr-2019, 12:55:49 PM How many inventors? 3 Enter inventor #1: Thomas Edison Enter inventor #2 : Alexander Graham Bell Enter inventor #3: George Washington Craver Enter Thomas Edison invention: Tin Foil Phonograph Enter Alexander Graham Bell invention: Telephone Enter George Washington Craver invention: Pomade from Peanuts Enter the years in which tin foil phonograph was invented: 1877 Enter the years in which telephone was invented: 1876 Enter the years in which pomade from peanuts was invented: 1925 FAMOUS INVENTIONS Reported By: Sarah Farrow Inventor: Thomas Edison Invention: Tin Foil Phonograph Year Invented: 1877 Inventor:Alexander Graham Bel1 Invention: Telephone Year Invented: 1876 Inventor: George Washington Craver Invention: Pomade from Peanuts Year Invented: 1925