record, enum va yopiq sinflar

public class Eski {
    public static void main(String[] args) {
        Talaba a = new Talaba("Husanboy", 25);
        Talaba b = new Talaba("Husanboy", 25);

        System.out.println(a);
        System.out.println("Teng-mi: " + a.equals(b));
    }
}

class Talaba {
    private final String ism;
    private final int yosh;

    Talaba(String ism, int yosh) {
        this.ism = ism;
        this.yosh = yosh;
    }

    String ism() {
        return ism;
    }

    int yosh() {
        return yosh;
    }

    @Override
    public String toString() {
        return "Talaba[ism=" + ism + ", yosh=" + yosh + "]";
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof Talaba t)) {
            return false;
        }
        return yosh == t.yosh && ism.equals(t.ism);
    }

    @Override
    public int hashCode() {
        return java.util.Objects.hash(ism, yosh);
    }
}

public class Yangi {
    public static void main(String[] args) {
        Talaba a = new Talaba("Husanboy", 25);
        Talaba b = new Talaba("Husanboy", 25);

        System.out.println(a);
        System.out.println("Teng-mi: " + a.equals(b));
        System.out.println("Xesh bir xilmi: "
                + (a.hashCode() == b.hashCode()));
        System.out.println("Ism: " + a.ism() + ", yosh: " + a.yosh());
    }
}

record Talaba(String ism, int yosh) {
}

import java.util.HashSet;
import java.util.Set;

public class Shartnoma {
    public static void main(String[] args) {
        Set<NotoGri> a = new HashSet<>();
        a.add(new NotoGri("Husanboy"));
        a.add(new NotoGri("Husanboy"));
        System.out.println("equals siz: " + a.size() + " ta element");

        Set<Togri> b = new HashSet<>();
        b.add(new Togri("Husanboy"));
        b.add(new Togri("Husanboy"));
        System.out.println("record bilan: " + b.size() + " ta element");
    }
}

class NotoGri {
    private final String ism;

    NotoGri(String ism) {
        this.ism = ism;
    }
}

record Togri(String ism) {
}

public class Tekshiruv {
    public static void main(String[] args) {
        System.out.println(new Ball("Husanboy", 92));

        try {
            new Ball("Malika", 150);
        } catch (IllegalArgumentException x) {
            System.out.println("Xato: " + x.getMessage());
        }

        try {
            new Ball("  ", 80);
        } catch (IllegalArgumentException x) {
            System.out.println("Xato: " + x.getMessage());
        }
    }
}

record Ball(String ism, int qiymat) {
    Ball {
        if (ism == null || ism.isBlank()) {
            throw new IllegalArgumentException("Ism bo'sh bo'lmasin");
        }
        if (qiymat < 0 || qiymat > 100) {
            throw new IllegalArgumentException(
                    "Ball 0..100 oralig'ida: " + qiymat);
        }
        ism = ism.strip();
    }
}

public class Metodli {
    public static void main(String[] args) {
        Nuqta n = new Nuqta(3, 4);

        System.out.println(n);
        System.out.printf("Masofa: %.1f%n", n.masofa());
        System.out.println("Siljitilgan: " + n.siljit(1, 1));
        System.out.println("Boshi: " + Nuqta.BOSH);
    }
}

record Nuqta(double x, double y) {
    static final Nuqta BOSH = new Nuqta(0, 0);

    double masofa() {
        return Math.sqrt(x * x + y * y);
    }

    Nuqta siljit(double dx, double dy) {
        return new Nuqta(x + dx, y + dy);
    }
}

public class Enum1 {
    public static void main(String[] args) {
        for (Daraja d : Daraja.values()) {
            System.out.printf("%-11s %d ball, %s%n",
                    d, d.engKam(), d.otdimi() ? "o'tdi" : "o'tmadi");
        }

        System.out.println();
        System.out.println("87 ball -> " + Daraja.aniqla(87));
        System.out.println("45 ball -> " + Daraja.aniqla(45));
        System.out.println("Nomdan: " + Daraja.valueOf("ALO"));
        System.out.println("Tartib raqami: " + Daraja.YAXSHI.ordinal());
    }
}

enum Daraja {
    QONIQARSIZ(0),
    QONIQARLI(60),
    YAXSHI(75),
    ALO(90);

    private final int engKam;

    Daraja(int engKam) {
        this.engKam = engKam;
    }

    int engKam() {
        return engKam;
    }

    boolean otdimi() {
        return this != QONIQARSIZ;
    }

    static Daraja aniqla(int ball) {
        Daraja natija = QONIQARSIZ;
        for (Daraja d : values()) {
            if (ball >= d.engKam) {
                natija = d;
            }
        }
        return natija;
    }
}

public class Yopiq {
    public static void main(String[] args) {
        Tolov[] tolovlar = {
                new Naqd(50000),
                new Karta("8600", 120000),
                new Otkazma("Malika", 75000)
        };

        for (Tolov t : tolovlar) {
            System.out.println(tavsif(t));
        }
    }

    static String tavsif(Tolov t) {
        return switch (t) {
            case Naqd n -> "Naqd: " + n.miqdor() + " so'm";
            case Karta k -> "Karta " + k.oxirgiRaqamlar() + ": " + k.miqdor();
            case Otkazma o -> "O'tkazma (" + o.kimga() + "): " + o.miqdor();
        };
    }
}

sealed interface Tolov permits Naqd, Karta, Otkazma {
    long miqdor();
}

record Naqd(long miqdor) implements Tolov {
}

record Karta(String oxirgiRaqamlar, long miqdor) implements Tolov {
}

record Otkazma(String kimga, long miqdor) implements Tolov {
}