Question

Write a java program that creates a hashtable with 10 objects and 5 data members using mutator and accessor methods for each data member.

Answer 1

if i miss something please et me know by comment as very less details given

Created Employee class 5 data members for adding to hashtable

//Employee.java

import java.util.Objects;

public class Employee {
   // class with 5 data members
   
   String fname;
   String lname;
   String ssn;
   int id;
   String city;
   
   // constructor
   public Employee(String fname, String lname, String ssn, int id, String city) {
      this.fname = fname;
      this.lname = lname;
      this.ssn = ssn;
      this.id = id;
      this.city = city;
   }
   
   public Employee() {
   }
   
   // setters and getters
   public String getFname() {
      return fname;
   }
   
   public void setFname(String fname) {
      this.fname = fname;
   }
   
   public String getLname() {
      return lname;
   }
   
   public void setLname(String lname) {
      this.lname = lname;
   }
   
   public String getSsn() {
      return ssn;
   }
   
   public void setSsn(String ssn) {
      this.ssn = ssn;
   }
   
   public int getId() {
      return id;
   }
   
   public void setId(int id) {
      this.id = id;
   }
   
   public String getCity() {
      return city;
   }
   
   public void setCity(String city) {
      this.city = city;
   }
   
   @Override
   public boolean equals(Object o) {
      if (this == o) return true;
      if (o == null || getClass() != o.getClass()) return false;
      Employee employee = (Employee) o;
      return id == employee.id &&
            Objects.equals(fname, employee.fname) &&
            Objects.equals(lname, employee.lname) &&
            Objects.equals(ssn, employee.ssn) &&
            Objects.equals(city, employee.city);
   }
   
   @Override
   public int hashCode() {
      return Objects.hash(fname, lname, ssn, id, city);
   }
   
   @Override
   public String toString() {
      return "Employee{" +
            "fname='" + fname + '\'' +
            ", lname='" + lname + '\'' +
            ", ssn='" + ssn + '\'' +
            ", id=" + id +
            ", city='" + city + '\'' +
            '}';
   }
}

Created main class for adding the object into hashtable , for key taken as int value

//EmployeeMain.java

import java.util.Hashtable;
import java.util.Iterator;
import java.util.Random;
import java.util.Set;

public class EmpoyeeMain {
   public static void main(String[] args) {
      // hashtable created
      Hashtable<Integer, Employee> hashtable = new Hashtable<>();
      for (int i = 0; i < 10; i++) {
         Employee e = new Employee();
         e.setFname(getRandomName());
         e.setLname(getRandomName());
         e.setSsn(getRandonSSN());
         e.setId(i+1);
         e.setCity("Pune");
         hashtable.put(i,e);//adding to hashtable
      }
      // printing table
      Set<Integer> keys = hashtable.keySet();
      Iterator<Integer> itr = keys.iterator();
      while (itr.hasNext()) {
         int i = itr.next();
         System.out.println("Key: "+i+" & Value: "+hashtable.get(i));
      }
      
   }
   
   //helper function
   public static String getRandomName() {
      String alphabets = leetter_digits.toLowerCase().substring(0, 25);
      StringBuilder builder = new StringBuilder();
      Random rand = new Random();
      int length = rand.nextInt(5) + 5;
      for (int i = 0; i < length; i++) {
         builder.append(alphabets.charAt(rand.nextInt(alphabets.length())));
      }
      return builder.toString();
      
   }
   
   final static String leetter_digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZ12345674890";
   
   public static String getRandonSSN() {
      Random rand = new Random();
      StringBuilder builder = new StringBuilder();
      
      int length = rand.nextInt(5) + 5;
      for (int i = 0; i < length; i++) {
         builder.append(leetter_digits.charAt(rand.nextInt(leetter_digits.length())));
      }
      
      return builder.toString();
   }
}

//OUTPUT it may differ as it used random

Key: 9 & Value: Employee{fname='igndlhmw', lname='mfwuurwy', ssn='1WN8JX', id=10, city='Pune'}
Key: 8 & Value: Employee{fname='pnqmoa', lname='jmjtww', ssn='BMEPH', id=9, city='Pune'}
Key: 7 & Value: Employee{fname='rbapxq', lname='uhpbcknyv', ssn='4IGO8', id=8, city='Pune'}
Key: 6 & Value: Employee{fname='htkjhxfg', lname='tnojnwgv', ssn='XRJ8XYJGR', id=7, city='Pune'}
Key: 5 & Value: Employee{fname='bsqsv', lname='onfqurc', ssn='QAHIDVZM', id=6, city='Pune'}
Key: 4 & Value: Employee{fname='qlncsa', lname='ehfprjg', ssn='9O40NOBHB', id=5, city='Pune'}
Key: 3 & Value: Employee{fname='mswogm', lname='kbitah', ssn='ACDJ7W4W', id=4, city='Pune'}
Key: 2 & Value: Employee{fname='unqgcupg', lname='ycpxvf', ssn='RXPZVQL', id=3, city='Pune'}
Key: 1 & Value: Employee{fname='smbqjuqob', lname='jwjwo', ssn='9NJ4K', id=2, city='Pune'}
Key: 0 & Value: Employee{fname='glerxjfg', lname='vccgc', ssn='ALHKV4YY7', id=1, city='Pune'}