Java – ArrayList Case Studies

Write code for following instructions:

  • Define Employee POJO with variables id, name, salary, dept, location.
  • Create an ArrayList of Employee type and store following values from arrays.
IdNameSalaryDeptLocation
101Amar3000020Hyderabad
102Hareen3500010Chennai
103Sathya4000020Bangalore
104Annie4500020Hyderabad
105Raji4200030Pune
106Harsha5000010Bangalore

Employee.class:

class Employee
{
            private int id;
            private String name;
            private double salary;
            private int dept;
            private String location;
            int getId(){
                        return this.id;
            }
            String getName(){
                        return this.name;
            }
            double getSalary(){
                        return this.salary;
            }
            int getDept(){
                        return this.dept;
            }
            String getLocation(){
                        return this.location;
            }
            void setId(int id){
                        this.id = id;
            }
            void setName(String name){
                        this.name = name;
            }
            void setSalary(double salary){
                        this.salary = salary;
            }
            void setDept(int dept){
                        this.dept = dept;
            }
            void setLocation(String location){
                        this.location = location;
            }
}

Main.java:

import java.util.*;
class Main
{
            public static void main(String[] args)  {
                        int[] ids = {101, 102, 103, 104, 105, 106};
                        String[] names = {“Amar”, “Hareen”, “Sathya”, “Annie”, “Raji”, “Harsha”};
                        double[] salaries = {30000, 35000, 40000, 45000, 42000, 50000};
                        int[] depts = {20, 10, 20, 20, 30, 10};
                        String[] locations = {“Hyderabad”, “Chennai”, “Bangalore”, “Hyderabad”, “Pune”, “Bangalore”};
 
                        List<Employee> list = new ArrayList<Employee>();
                        for (int i=0 ; i<=ids.length-1 ; i++) {
                                    Employee e = new Employee();
                                    e.setId(ids[i]);
                                    e.setName(names[i]);
                                    e.setSalary(salaries[i]);
                                    e.setDept(depts[i]);
                                    e.setLocation(locations[i]);
                                    list.add(e);
                        }
                        System.out.println(“Details are : “);
                        for(Employee e : list)
                        {
                                    System.out.println(e.getId() + ” ,” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
                        }
            }
}

Display details using for loop:

for(int i=0 ; i<=list.size()-1 ; i++)
{
            Employee e = list.get(i);
            System.out.println(e.getId() + ” ,” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
}

Display details in reverse order:

for(int i=list.size()-1 ; i>=0 ; i–)
{
            Employee e = list.get(i);
            System.out.println(e.getId() + ” ,” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
}

Display Employee details whose ID is 103:

boolean found=false;
for(Employee e : list)
{
            if(e.getId() == 103)
            {
                        System.out.println(e.getId() + ” ,” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
                        found = true;
                        break;
            }
}
if(!found)
{
            System.out.println(“ID 103 doesn’t exist”);
}

Display Employee details belongs to Hyderabad:

int count=0;
for(Employee e : list)
{
            if(e.getLocation().equals(“Hyderabad”))
            {
                        System.out.println(e.getId() + ” ,” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
                        count++;
            }
}
if(count==0)
{
            System.out.println(“No employee belongs to Hyderabad”);
}

Display Employee details belongs in department 20 or 30:

int count=0;
for(Employee e : list)
{
            if(e.getDept()==20 || e.getDept()==30)
            {
                        System.out.println(e.getId() + ” ,” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
                        count++;
            }
}
if(count==0)
{
            System.out.println(“No employee belongs depts 20 or 30”);
}

Display employee details those who not belongs to Hyderabad.

int count=0;
for(Employee e : list)
{
            if(!(e.getLocation().equals(“Hyderabad”)))
            {
                        System.out.println(e.getId() + ” ,” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
                        count++;
            }
}
if(count==0)
{
            System.out.println(“No employee records founds”);
}

Display details belongs to department 20 and not belongs to Hyderabad:

int count=0;
for(Employee e : list)
{
            if(e.getDept()==20 && !(e.getLocation().equals(“Hyderabad”)))
            {
                        System.out.println(e.getId() + ” ,” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
                        count++;
            }
}
if(count==0)
{
            System.out.println(“No employee records founds”);
}

Count how many employees working in both Hyderabad and Bangalore locations:

int count=0;
for(Employee e : list)
{
            String loc = e.getLocation();
            if(loc.equals(“Hyderabad”) || loc.equals(“Bangalore”))
            {
                        count++;
            }
}
System.out.println(“Count is : ” + count);

Check the Employee with name “Amar” present or not:

boolean found=false;
for(Employee e : list)
{
            if(e.getName().equals(“Amar”))
            {
                        System.out.println(“Found with ID : ” + e.getId());
                        found=true;
                        break;
            }
}
if(!found)
{
            System.out.println(“Amar not present”);
}

Display details whose salary greater than 35000:

int count=0;
for(Employee e : list)
{
            if(e.getSalary()>35000)
            {
                        System.out.println(e.getId() + ” , ” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
                        count++;
            }
}
if(count==0)
{
            System.out.println(“No employee found”);
}

Display details whose salary between 30000 and 40000:

int count=0;
for(Employee e : list)
{
            if(e.getSalary()>30000 && e.getSalary()<40000)
            {
                        System.out.println(e.getId() + ” , ” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
                        count++;
            }
}
if(count==0)
{
            System.out.println(“No employee found”);
}

Display details whose salary below 40000 and not belongs to Hyderabad:

int count=0;
for(Employee e : list)
{
            if(e.getSalary()<40000 && !(e.getLocation().equals(“Hyderabad”)))
            {
                        System.out.println(e.getId() + ” , ” + e.getName() + ” , ” + e.getSalary() + ” , ” + e.getDept() + ” , ” + e.getLocation());
                        count++;
            }
}
if(count==0)
{
            System.out.println(“No employee found”);
}
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