Question

Write a java program that makes use of the ‘DO WHILE ’ loop. The program asks a user to enter information about several of their friends. The information is their last name, the state they live in, their age, and their expected graduation year. After you enter one friend, write out each individually. You must use JOptionPane to input the 4 fields, and to output the 4 fields. Refer to the textbook Code Listing 4-6 to see how to use ‘char repeat’ to terminate the do while loop.

Answer 1

Hi,

Please find the java program below:
-------------------------------------

Java Classes:

// class used to store friend information
public class Friend {

   private String lastName;
   private String state;
   private int age;
   private int graduationYear;

   //Constructor
   public Friend(String lastName, String state, int age, int graduationYear) {
       super();
       this.lastName = lastName;
       this.state = state;
       this.age = age;
       this.graduationYear = graduationYear;
   }

   public String getLastName() {
       return lastName;
   }
   public void setLastName(String lastName) {
       this.lastName = lastName;
   }
   public String getState() {
       return state;
   }
   public void setState(String state) {
       this.state = state;
   }
   public int getAge() {
       return age;
   }
   public void setAge(int age) {
       this.age = age;
   }
   public int getGraduationYear() {
       return graduationYear;
   }
   public void setGraduationYear(int graduationYear) {
       this.graduationYear = graduationYear;
   }

}

///////////////////////////////////////////////////////////////

import java.util.Scanner;

import javax.swing.JOptionPane;

public class MainProgram {

   /**
   * @param args
   */
   public static void main(String[] args) {
       int age;
       int year;
       String name;
       String state;
       char repeat;
       Scanner keyboard= new Scanner(System.in);
       String userInput;

       do{
           name = JOptionPane.showInputDialog("Please input lastname:");
           state = JOptionPane.showInputDialog("Please input state:");
           age = Integer.parseInt(JOptionPane.showInputDialog("Please input age:"));
           year = Integer.parseInt(JOptionPane.showInputDialog("Please input graduation year:"));

           Friend f= new Friend(name,state,age,year);

           System.out.println("##########Friend Information############");
           System.out.println("Last Name      :=" + f.getLastName());
           System.out.println("State          :=" + f.getState());
           System.out.println("Age            :=" + f.getAge());
           System.out.println("GraduationYear :=" + f.getGraduationYear());
           System.out.println("######################");
           System.out.println("Would you like to input another friend information?");
           userInput= keyboard.nextLine();
           repeat= userInput.charAt(0);
       }while(repeat == 'Y' || repeat == 'y');
   }

}

Screenshot:

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Let me know if you need more information on this in the comments.
Hope this helps.