CSE215 Lab Final Task A

Main.java

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) throws FileNotFoundException {
        Scanner sc=new Scanner(System.in);
        File file = new File("residents.txt");
        sc = null;
        int size=0;
        sc = new Scanner(file);
        while (sc.hasNext()){
            sc.nextLine();
            size++;
        }
        sc.close();
        sc=new Scanner(file);
        Residents[] residents = new Residents[size];
        int i=0;
        while (sc.hasNext()) {
            String[] str = sc.nextLine().split(" ");
            residents[i]=new Residents(str[0]+" "+str[1],str[2], Double.parseDouble(str[3]));
            i++;
        }
        sc.close();
        Residents residents1=new Residents(null,null, 0);
        residents1.makeList();
    }


}

class Residents implements Validate {
    private String name;
    private String nid;
    private double salary;

    public Residents(String name, String nid, double salary) {
        this.name = name;
        this.nid = nid;
        this.salary = salary;
    }

    public int getAge() {
        return 2021 - Integer.parseInt(nid.substring(0, 4));
    }

    public void makeList() {
        File file = new File("residents.txt");
        Scanner sc = null;
        if (file.exists()) {
            try {
                sc = new Scanner(file);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        } else {
            sc = new Scanner(System.in);
        }
        while (sc.hasNext()) {
            String[] str = sc.nextLine().split(" ");
            name = str[0] + " " + str[1];
            nid = str[2];
            double age = getAge();
            salary = Double.parseDouble(str[3]);
            if (validateNID() && (age <= 65) && salary<=350000) {
                System.out.println(this);
            }
        }
        sc.close();

    }


    @Override
    public boolean validateNID() {
        return nid.length() == 17;
    }

    @Override
    public String toString() {
        return "Residents{" +
                "name='" + name + '\'' +
                ", nid='" + nid + '\'' +
                ", salary=" + salary +
                '}';
    }
}

interface Validate {
    boolean validateNID();
}