Java OOP Assignment: Student Data and Financial Analysis

This Java assignment presents a solution for an Object-Oriented Programming (OOP) task. The program is designed to manage student data and perform financial calculations. The code includes classes for 'Person' and 'Calculate', enabling the input of student names, IDs, salaries, and expenses. The program then calculates savings, and estimates the time needed to save for a down payment on a house based on entered rent preferences. The solution incorporates user input through the console, providing a menu-driven interface for data entry and retrieval. The program also displays average yearly savings and provides a summary of financial data based on the input from five users. The code demonstrates the application of OOP principles such as encapsulation and modularity, providing a practical example of Java programming for financial analysis and data management. The assignment solution is designed to help students understand and apply OOP concepts in a real-world scenario.

Object Oriented Programming with Java
Name of the Student:
Name of the University:
Author note:

Source Code:
/*
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*/
package javaapplication31;
import java.util.Scanner;
/**
*
* @author LAPTOP_MP340
*/
class Person{
String name[]= new String[50];
String roll[]= new String[20];
Scanner sc= new Scanner(System.in);

int j;
void getDetails(){
System.out.print("Enter Student Name :");
name[j]=sc.nextLine();
System.out.print("Enter Student ID:");
roll[j]=sc.nextLine();
}
void show(){
System.out.println("\
n#############################################################");
System.out.println("\nThank you using this system");
System.out.println("\nGood Bye");
System.out.println("\nStudent ID :"+roll[j]);
System.out.println("\nStudent Name :"+name[j]);
System.out.println("\
n###########################################################"
+ "");

}
}
class Calculate{
int price = 0, years=0, year;//[] salary = new int[10];
int[] expenses = new int[10];
int[] rent = new int[10];
int i;
Scanner sc= new Scanner(System.in);
int calculate(int rent[]){
for(i=0; i<5;i++){
if(rent[i]<500000){
price +=(rent[i]*5)/100;}
else if(rent[i]<=1000000){
price+=(rent[i]*10)/100;
}
else{

price=(rent[i]*15)/100;
}
years+=rent[i]/price;
}
System.out.println("\nSaving down payment : $"+price);
return years;
}
}
public class JavaApplication31 {
public static void main(String args[])
throws java.io.IOException {
int n,ch,i,j = 0, saving=0, sum=0, sum1=0, down_payment=0, savings = 0, year;

int[] salary = new int[10];
int[] expenses = new int[10];
int[] rent = new int[10];
int[] price = new int[10];
String name[]= new String[50];
String roll[]= new String[20];
Scanner sc=new Scanner(System.in);
Calculate c=new Calculate();
Person p=new Person();
//System.out.println("Enter the number of person : ");
//n=sc.nextInt();
while(true) {
System.out.println(" 1. Start");
System.out.println(" 2. Exit\n");
System.out.println("\nChoose one option:");

ch = sc.nextInt();
switch(ch) {
case 1:
for (i=0; i<5; i++){
System.out.println("\nStudent "+(i+1)+"-> ");
p.getDetails();
System.out.print(java.time.LocalDate.now());
System.out.println("\
n######################################################");
System.out.print("Enter Salary for the Month : $");
salary[i]=sc.nextInt();
System.out.print("Enter Expeses for the Month : $");
expenses[i]=sc.nextInt();
sum+=salary[i];
sum1+=expenses[i];
savings+=(sum-sum1)/12;

System.out.print("Enter prerferred house rent : $");
rent[i]=sc.nextInt();
year=c.calculate(rent);
System.out.println("\
n##############################################################");
System.out.println("\nAccording to data entered from five users on current date :
"+java.time.LocalDate.now());
System.out.println("\nTheir Average yearly savings = $"+savings);
System.out.println("\nThey need average of "+year+" to save their down payment. ");
System.out.println("\nThank you for using the system. ");
System.out.println("#######################################################
#######");
}
break;
case 2: for(i=0; i<5;i++){
System.out.println("Student "+(i+1)+"-> ");
p.show();
}

break;
case 3: System.exit(0);
default: System.out.println("Invalid selection.\n");
}
}
}
}