Acc

 Beans


package com.demo.beans;


import java.io.Serializable;


public class Employee implements Serializable {

private int empid;

private String ename;

private double sal;

private double bonus;

public Employee() {

super();

}

public Employee(int empid, String ename, double sal, double bonus) {

super();

System.out.println("in parametrised constructor");

this.empid = empid;

this.ename = ename;

this.sal = sal;

this.bonus = bonus;

}

@Override

public boolean equals(Object obj) {

System.out.println("in employee equals method "+this.empid+"-----"+((Employee)obj).empid);

return this.empid==((Employee)obj).empid;

}

public Employee(int empid) {

super();

this.empid = empid;

}

public int getEmpid() {

System.out.println("in getEmpid");

return empid;

}

public void setEmpid(int empid) {

System.out.println("in setEmpid");

this.empid = empid;

}

public String getEname() {

System.out.println("in getEname");

return ename;

}

public void setEname(String ename) {

System.out.println("in setename");

this.ename = ename;

}

public double getSal() {

return sal;

}

public void setSal(double sal) {

System.out.println("in setSal");

this.sal = sal;

}

public double getBonus() {

System.out.println("in getBonus");

return bonus;

}

public void setBonus(double bonus) {

System.out.println("in setBonus");

this.bonus = bonus;

}

@Override

public String toString() {

return "Employee [empid=" + empid + ", ename=" + ename + ", sal=" + sal + ", bonus=" + bonus + "]";

}


}



Dao : 


package com.demo.dao;


import java.util.List;


import com.demo.beans.Employee;

import com.demo.exceptions.EmployeeNotFound;


public interface EmployeeDao {


void readDataFromFile(String fname);


void save(Employee e);


List<Employee> findAll();


void writeToFile(String fname);


boolean removeById(int id) throws EmployeeNotFound;


boolean modifyById(int id, double sal) throws EmployeeNotFound;


}


package com.demo.dao;


import java.io.EOFException;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.util.ArrayList;

import java.util.List;


import com.demo.beans.Employee;

import com.demo.exceptions.EmployeeNotFound;


public class EmployeeDaoImpl implements EmployeeDao{

static List<Employee> elst;

static {

elst=new ArrayList<>();

}

@Override

public void readDataFromFile(String fname) {

try(ObjectInputStream oos=new ObjectInputStream(new FileInputStream(fname));){

while(true) {

Employee e=(Employee) oos.readObject();

elst.add(e);

}

} catch(EOFException e) {

System.out.println("reached to end of file...."+elst.size());

} catch(FileNotFoundException e) {

System.out.println("file does not exists");

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (ClassNotFoundException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

}

@Override

public void save(Employee e) {

elst.add(e);

}

@Override

public List<Employee> findAll() {

return elst;

}

@Override

public void writeToFile(String fname) {

try(ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream(fname));){

for(Employee e:elst) {

oos.writeObject(e);

}

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

@Override

public boolean removeById(int id) throws EmployeeNotFound {

boolean flag= elst.remove(new Employee(id));

if(flag)

return flag;

throw new EmployeeNotFound("Not found "+id);

}

@Override

public boolean modifyById(int id, double sal) throws EmployeeNotFound {

int pos=elst.indexOf(new Employee(id));

if(pos!=-1) {

Employee e=elst.get(pos);

e.setSal(sal);

return true;

}

throw new EmployeeNotFound("updation fail, not found "+id);

}


}


Exceptions


package com.demo.exceptions;


public class EmployeeNotFound extends Exception{

public EmployeeNotFound(String msg) {

super(msg);

}


}


Test :


package com.demo.test;


import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;


public class TestBufferedInputStream {


public static void main(String[] args) {

File f=new File("test1copy.txt");

BufferedOutputStream bos=null;

try {

if(f.exists()) {

//effectively final

//open the file in append mode

bos=new BufferedOutputStream(new FileOutputStream(f,true));

}else {

//open the file in write mode

bos=new BufferedOutputStream(new FileOutputStream(f));

}

}catch(IOException e) {

e.printStackTrace();

}

try(BufferedInputStream bis=new BufferedInputStream(new FileInputStream("test1.txt"));

BufferedOutputStream bos1=bos;){

//read one byte and write one byte till end of the file

int c=bis.read();

while(c!=-1) {

bos.write(c);

c=bis.read();

}

}catch(FileNotFoundException e) {

System.out.println("file not found");

}catch(IOException e) {

System.out.println("input output error occured");

}


}


}


Test 2


package com.demo.test;


import java.util.List;

import java.util.Scanner;


import com.demo.beans.Employee;

import com.demo.exceptions.EmployeeNotFound;

import com.demo.service.EmployeeService;

import com.demo.service.EmployeeServiceImpl;


public class TestEmployeemgnt {

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

int choice=0;

EmployeeService eservice=new EmployeeServiceImpl();

eservice.readFile("empdata.dat");

do {

System.out.println("1. Add new Employee\n2. delete Employee\n3. update employee\n");

System.out.println("4. display all\n5.exit\nchoice:");

choice=sc.nextInt();

switch(choice) {

case 1->{

eservice.addnewEmployee();

}

case 2->{

try {

System.out.println("enter id");

int id=sc.nextInt();

boolean status=eservice.deleteById(id);

if(status) {

System.out.println("deleted successfully");

}

}catch(EmployeeNotFound e) {

System.out.println(e.getMessage());

}

}

case 3->{

try {

System.out.println("enter id");

int id=sc.nextInt();

System.out.println("enter new salary");

double sal=sc.nextDouble();

boolean status=eservice.updateById(id,sal);

if(status) {

System.out.println("updated successfully");

}

}catch(EmployeeNotFound e) {

System.out.println(e.getMessage());

}

}

case 4->{

List<Employee> elst=eservice.getAll();

elst.stream().forEach(System.out::println);

}

case 5->{

eservice.writeFile("empdata.dat");

System.out.println("thank you for visiting....");

sc.close();

}

default->{}

}

}while(choice!=5);

}


}


Test 3


package com.demo.test;


import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;


public class TestBufferedReader {

public static void main(String[] args) {

try(BufferedReader br=new BufferedReader(new FileReader("test1.txt"));){

String s=br.readLine();

while(s!=null) {

System.out.println(s);

s=br.readLine();

}

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}


}



ServiceImpl : 


package com.demo.service;


import java.util.List;

import java.util.Scanner;


import com.demo.beans.Employee;

import com.demo.dao.EmployeeDao;

import com.demo.dao.EmployeeDaoImpl;

import com.demo.exceptions.EmployeeNotFound;


public class EmployeeServiceImpl implements EmployeeService{

private EmployeeDao edao;

public EmployeeServiceImpl() {

edao=new EmployeeDaoImpl();

}

@Override

public void readFile(String fname) {

edao.readDataFromFile(fname);

}

@Override

public void addnewEmployee() {

Scanner sc=new Scanner(System.in);

System.out.println("enter id");

int id=sc.nextInt();

System.out.println("enter name");

String nm=sc.next();

System.out.println("enter sal");

double sal=sc.nextDouble();

Employee e=new Employee(id,nm,sal,sal*0.10);

edao.save(e);

}

@Override

public List<Employee> getAll() {

return edao.findAll();

}

@Override

public void writeFile(String fname) {

edao.writeToFile(fname);

}

@Override

public boolean deleteById(int id) throws EmployeeNotFound {

return edao.removeById(id);

}

@Override

public boolean updateById(int id, double sal) throws EmployeeNotFound {

return edao.modifyById(id,sal);

} 


}


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