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public class Catalog {
    Map<String,String> map = new HashMap<>();
 
    public String get(String surName)
    {
        String data = map.get(surName);
        if(data==null) return "No data found";
        return data;
    }
    public void put(String surName,String data)
    {
        map.put(surName,data);
    }
   
}

package com.info;
import java.util.Scanner;
public class People {
 
    public static void main(String[] args) {
        Person oleg = new Person("Oleg","Ivanov","12.02.1980",10000, new Address("UA","Lviv","Naukova"));
        Person ivan = new Person("Ivan","Buy","1.05.1986", 5000, new Address("USA","LA","65_St"));
        Person veronika = new Person("Veronika","Karpova","10.12.1985",12000, new Address("RU","Moskva","Lenina"));
        Person karina = new Person("Karina","Ivanova","25.02.1990",5000, new Address("UA","Lviv","Franka"));
        Person marina = new Person("Marina","Filatova","2.02.1975",20000, new Address("UA","Chop","Sonyachna"));
    
        String s1;
        
        Scanner sc = new Scanner(System.in);
        s1 = sc.nextLine(); 
        
    }
 
}

public class Address {
 
    private final String country;
    private final String city;
    private final String street;
 
    public Address(String country, String city, String street) {
        this.country = country;
        this.city = city;
        this.street = street;
    }
 
    @Override
    public String toString() {
        return "страна: " + country + ", город: " + city + ", улица: " + street;
    }
 
    public static void main(String[] args) {
        Address a = new Address("RU", "Moskva", "Lenina");
        System.out.println(a);
    }
}

public class Person {
 
    private final String firstName;
    private final String lastName;
    private final String birthday;
    private final int magicNumber;
    private final Address address;
 
    public Person(String firstName,
                  String lastName,
                  String birthday,
                  int magicNumber,
                  Address address) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.birthday = birthday;
        this.magicNumber = magicNumber;
        this.address = address;
    }
 
    public String getLastName() {
        return lastName;
    }
 
    @Override
    public String toString() {
        return "имя: " + firstName + ", фамилия: " + lastName +
               "\nдень рождения: " + birthday + ", magicNumber: " + magicNumber +
               "\nадрес: " + address;
    }
 
    public static void main(String[] args) {
        Person p = new Person("Oleg", "Ivanov", "12.02.1980", 10000,
                              new Address("UA", "Lviv", "Naukova"));
 
        System.out.println(p);
        System.out.println(p.getLastName());
    }
}

import java.util.*;
 
public class Catalog {
 
    private final Collection<Person> catalog;
 
    public Catalog() {
        catalog = new ArrayList<Person>();
    }
 
    public void add(Person person) {
        catalog.add(person);
    }
 
    public Person search(String lastName) {
        Person result = null;
        for (Person element : catalog) {
            String elementLastName = element.getLastName();
            if (elementLastName.equals(lastName)) {
                result = element;
                break;
            }
        }
        return result;
    }
 
    public static void main(String[] args) {
        Catalog catalog = new Catalog();
        catalog.add(new Person("Oleg","Ivanov","12.02.1980",10000, new Address("UA","Lviv","Naukova")));
 
        Person person = catalog.search("Ivanov");
        System.out.println(person);
        
        person = catalog.search("Petrov");
        System.out.println(person);
    }
            
}

import java.util.Scanner;
 
public class CatalogDemo {
 
    public static void main(String[] args) {
        Catalog catalog = new Catalog();
        catalog.add(new Person("Oleg","Ivanov","12.02.1980",10000, new Address("UA","Lviv","Naukova")));
        catalog.add(new Person("Ivan","Buy","1.05.1986", 5000, new Address("USA","LA","65_St")));
        catalog.add(new Person("Veronika","Karpova","10.12.1985",12000, new Address("RU","Moskva","Lenina")));
        catalog.add(new Person("Karina","Ivanova","25.02.1990",5000, new Address("UA","Lviv","Franka")));
        catalog.add(new Person("Marina","Filatova","2.02.1975",20000, new Address("UA","Chop","Sonyachna")));
 
        Scanner sc = new Scanner(System.in);
        String input = sc.nextLine();
 
        Person result = catalog.search(input);
        if (result == null) {
            System.out.println("No data found");
        }
        else {
            System.out.println(result);
        }
    } 
}