artem-smotrakov

static String print(int n) {
    return switch (n) {
        case 0  -> "zero";
        case 1  -> "one";
        case 2  -> "two";
        default -> "many";
    };
}

artem-smotrakov

public class InvalidSwitchExpressionWithoutDefault {

    public static void main(String[] args) {
        System.out.println(print(1));
    }

    static String print(int n) {
        return switch (n) {
            case 0 -> "zero";
            case 1 -> "one";

artem-smotrakov

public class WhoIsWho {

    enum Person {
        Mozart, Picasso, Goethe, Dostoevsky, Prokofiev, Dali,

        Gaudi, Bach, Einstein
    }

    public static void main(String[] args) {
        print(Person.Mozart);

artem-smotrakov

static int factorial(int n) {
    return switch (n) {
        case 0, 1 -> 1;
        case 2    -> 2;
        default   -> factorial(n - 1) * n;
    };
}

artem-smotrakov

String title = switch (person) {
    case Dali, Picasso      -> "painter";
    case Mozart, Prokofiev  -> "composer";
    case Goethe, Dostoevsky -> "writer";
    default                 -> "...";                     
};

artem-smotrakov

public class InvalidWhoIsWho {

    enum Person {
        Mozart, Picasso, Goethe, Dostoevsky, Prokofiev, Dali,

        // this element is not covered
        // by any case in the switch expression below
        // which results to compilation failure
        Gaudi
    }

artem-smotrakov

public class WhoIsWho {

    enum Person {
        Mozart, Picasso, Goethe, Dostoevsky, Prokofiev, Dali
    }

    public static void main(String[] args) {
        print(Person.Mozart);
        print(Person.Dali);
        print(Person.Dostoevsky);

artem-smotrakov

public class ClassicSwitchStatement {

    enum Person {
        Mozart, Picasso, Goethe, Dostoevsky, Prokofiev, Dali
    }

    public static void main(String[] args) {
        print(Person.Mozart);
        print(Person.Dali);
        print(Person.Dostoevsky);

artem-smotrakov

package com.gypsyengineer.jackson.unsafe.one;

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import java.io.Serializable;

public class Person {

    public String name;
    public int age;

artem-smotrakov

package com.gypsyengineer.jackson.unsafe.one;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.json.JsonMapper;
import com.fasterxml.jackson.databind.jsontype.BasicPolymorphicTypeValidator;
import com.fasterxml.jackson.databind.jsontype.PolymorphicTypeValidator;

public class SaferPersonDeserialization {

    private static final String bad =