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23Ruslan23Ruslan
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test task
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‎MySQL8_ruslan.docx

112 KB
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‎full description of the task.JPG

176 KB
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‎java16_ruslan/Task1.java

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class Task1 {
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private static String p;
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static boolean reg(String S) { // just input control
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java.util.regex.Pattern p = java.util.regex.Pattern.compile("[0-9]+");
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java.util.regex.Matcher m = p.matcher(S);
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return m.matches();
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}
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public static String method1(int n) { //via Sieve of Eratosthenes algorithm, O(N*log(log(N)))
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boolean[] prime = new boolean[n + 1];
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java.util.Arrays.fill(prime, true);
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prime[1] = false;
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int sum = 1;
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for (int i = 2; i * i <= n; i++)
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if (prime[i])
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for (int j = i * i; j <= n; j += i) // before sqrt
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if (prime[j]) {
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sum += 1;
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prime[j] = false;
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}; //subtract the number of non-primes from the total number of numbers:
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return (n - sum) + ", i. e. " + java.lang.Math.round(100.0 * (n - sum) / n) + "%";
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}
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public static String method2(int n) { //via direct calculation, O(N^2). Just to compare and test the results
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int temporary = 0, sum = 0;
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for (int j = 2; j <= n; j++) {
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for (int i = 2; i <= java.lang.Math.ceil(j / 2.0); i++)
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if ((temporary = j % i) == 0) break;
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sum += (temporary == 0) ? (0) : (1);
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}
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return ((n > 2) ? (sum + 1) : 1) + ", i. e. " + java.lang.Math.round(100.0 * (sum + 1) / n) + "%";
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}
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public static void main(String[] args) {
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System.out.println("Input natural number N and press Enter:");
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while (true) {
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p = (new java.util.Scanner(System.in)).next();
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if (reg(p)) {
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break;
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} else {
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System.out.println("Input only digits:");
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}
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}
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int n = Integer.valueOf(p);
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System.out.println("The number of primes in the interval (0,N]:");
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System.out.print((n <= 1) ? "0, 0%" : method1(n));
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}
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}

‎java16_ruslan/inputForTask2.txt

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Belarus Minsk 2 Minsk 3 Minsk Minsk Minsk 10000 Borisov Borisov 5003 Molodechno Molodechno 1020 Vitebsk 3 Vitebsk Vitebsk Vitebsk 20000 Polotsk Polotsk 8100 Baranovichi Baranovichi 5000

‎java16_ruslan/task2/City.java

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package task2;
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public class City {
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public String name;
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public City(String name) {
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this.name = name;
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}
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public City() {}
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public void setName(String name) {
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this.name = name;
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}
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public String getName() {
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return name;
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}
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@Override public String toString() {
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return name;
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}
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}

‎java16_ruslan/task2/Country.java

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package task2;
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public class Country extends Region {
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public City Capital;
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public int numberr;
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public Region[] Regions = new Region[numberr + 5];
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public Country() {}
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public Country(String name, City capitalCity, int numberr, Region[] regions) {
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super(name, capitalCity);
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this.numberr = numberr;
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Regions = regions;
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}
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public City getCapital() {
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return Capital;
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}
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public void setNumberr(int numberr) {
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this.numberr = numberr;
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}
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public void setCapital(City capital) {
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Capital = capital;
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}
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public void setRegions(Region[] regions) {
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Regions = regions;
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}
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public int getNumberr() {
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return numberr;
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}
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public void getRegionCenters() {
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for (int i = 0; i < numberr; i++)
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System.out.println("\n"+Regions[i].getCapitalCity());
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}
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public void getRegionCount() {
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System.out.println("\nAnd the total number of regions is " + numberr +"\n*************************************");
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}
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@Override
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public double CalculateSquare() {
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double s = 0;
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for (int i = 0; i < numberr; i++)
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s += Regions[i].CalculateSquare();
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return s;
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}
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@Override
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public int hashCode() {
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int result = super.hashCode();
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result = 29 * result + (name != null ? name.hashCode() : 0);
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) return true;
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if (obj == null || getClass() != obj.getClass()) return false;
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//if (!super.equals(obj)) return false;
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Country country = (Country) obj;
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return !(name != null ? !name.equals(country.name) : country.name != null);
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}
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@Override
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public String toString() {
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return "Country{" +
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"name='" + name + '\'' +
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", CapitalCity='" + CapitalCity + '\'' +
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", square=" + square +
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'}';
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}
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}

‎java16_ruslan/task2/District.java

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package task2;
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public class District {
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public String name;
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public City CapitalCity;
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public double square;
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public class SquareLogicException extends Exception {
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public SquareLogicException() {}
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public SquareLogicException(String message, Throwable exception) {
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super(message, exception);
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}
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public SquareLogicException(String message) {
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super(message);
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}
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public SquareLogicException(Throwable exception) {
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super(exception);
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}
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}
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public District() {}
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public District(String name, City capitalCity) {
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this.name = name;
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CapitalCity = capitalCity;
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}
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public District(String name, City capitalCity, double square) throws SquareLogicException {
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if (square <= 0) {
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throw new SquareLogicException("incorrect square");
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}
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this.name = name;
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CapitalCity = capitalCity;
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this.square = square;
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}
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public String getName() {
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return name;
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}
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public City getCapitalCity() {
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return CapitalCity;
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}
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public double getSquare() {
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return square;
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}
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public void setName(String name) {
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this.name = name;
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}
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public void setCapitalCity(City capitalCity) {
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CapitalCity = capitalCity;
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}
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public void setSquare(double square) {
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this.square = square;
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}
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@Override
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public String toString() {
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return "District{" +
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"name='" + name + '\'' +
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", CapitalCity='" + CapitalCity + '\'' +
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", square=" + square +
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'}';
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}
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public double CalculateSquare() {
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return square;
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}
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}

‎java16_ruslan/task2/Region.java

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package task2;
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public class Region extends District {
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public int numberd;
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public District[] Districts = new District[numberd + 10];
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public Region() {}
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public Region(String name, City capitalCity) {
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super(name, capitalCity);
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}
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public Region(String name, City capitalCity, int number, District[] districts) {
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super(name, capitalCity);
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this.numberd = number;
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Districts = districts;
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}
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@Override
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public double CalculateSquare() {
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double S = 0;
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for (int i = 0; i < numberd; i++)
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S += Districts[i].CalculateSquare();
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return S;
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}
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@Override
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public int hashCode() {
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int result = super.hashCode();
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result = 29 * result + (name != null ? name.hashCode() : 0);
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) return true;
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if (obj == null || getClass() != obj.getClass()) return false;
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//if (!super.equals(obj)) return false;
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Region region = (Region) obj;
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return !(name != null ? !name.equals(region.name) : region.name != null);
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}
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@Override
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public String toString() {
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return "Region{" +
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"name='" + name + '\'' +
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", CapitalCity='" + CapitalCity + '\'' +
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", square=" + square +
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'}';
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}
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}

‎java16_ruslan/task2/RunTheProgram.java

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package task2;
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import java.io.*;
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import java.util.*;
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public class RunTheProgram {
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private static String p;
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static boolean reg(String S) { // just input control
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java.util.regex.Pattern p = java.util.regex.Pattern.compile("[1-5]");
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java.util.regex.Matcher m = p.matcher(S);
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return m.matches();
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}
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public static void main(String[] args) throws District.SquareLogicException {
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try {
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Scanner in = new Scanner(new File("inputForTask2.txt"));
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Country country = new Country();
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String name = in .next();
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String capital = in .next();
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City capital0 = new City(capital);
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int numberr = in .nextInt();
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Region[] regions = new Region[numberr + 5];
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for (int i = 0; i < numberr; i++) {
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String namei = in .next();
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int numberdi = in .nextInt();
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String capitali = in .next();
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City capitali0 = new City(capitali);
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District[] districts = new District[numberdi + 5];
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for (int j = 0; j < numberdi; j++) {
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String nameij = in .next();
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String capitalij = in .next();
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City capitalij0 = new City(capitalij);
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double squareij = in .nextDouble();
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districts[j] = new District(nameij, capitalij0, squareij);
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}
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regions[i] = new Region(namei, capitali0, numberdi, districts);
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}
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country.setName(name);
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country.setCapital(capital0);
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country.setNumberr(numberr);
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country.setRegions(regions);
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//country.getName();
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int memory1 = 9, choice = -7;
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try {
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while (choice != 0) {
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System.out.print("\nSelect an option (method) and then press Enter:\n1. Show this capital\n2. Show this regions' centers and the total number of regions\n3. Compute this square\n4. Exit!\n");
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int[] mem1 = new int[java.lang.Math.abs(memory1)];
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memory1 *= (choice == 5) ? 100 : 1;
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if (choice != 5) // in console select option 5 just for testing out of memory
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while (true) { // just input control
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p = (new java.util.Scanner(System.in)).next();
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if (reg(p)) {
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choice = Integer.valueOf(p);
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break;
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} else {
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System.out.println("Enter only one natural number between 1 and 5:");
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}
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}
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switch (choice) {
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case 1:
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System.out.println("\n"+country.getCapital()+"\n*************************************");
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break;
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case 2:
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country.getRegionCenters();
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country.getRegionCount();
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break;
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case 3:
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System.out.println("\n"+country.CalculateSquare()+"\n*************************************");
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break;
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case 4:
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System.exit(0);
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break;
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default:
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break;
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}
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}
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} catch (OutOfMemoryError e) {
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System.out.println("out of memory");
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}
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} catch (FileNotFoundException e) {
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System.out.println("cannot open the file inputForTask2.txt");
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} catch (District.SquareLogicException e) {
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System.out.println("square is negative or incorrectly defined");
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}
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}
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}

‎java16_ruslan/task2_readme.txt

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open bash in the directory of this .txt file
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javac task2/RunTheProgram.java
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java task2.RunTheProgram

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