Demonstrating classic thread safety issue with object reference being reused and passed to another thread

Program.out

Thread-0 Person{name='Init', age=0}
Thread-0 Person{name='Init', age=0}
Thread-0 Person{name='Init', age=0}
main Person{name='Foo', age=-1356876606}
Thread-0 Person{name='Foo', age=-1356876606}
Thread-0 Person{name='Foo', age=-1356876606}
Thread-0 Person{name='Foo', age=-1356876606}
main Person{name='Bar', age=1050348248}
Thread-0 Person{name='Bar', age=1050348248}
Thread-0 Person{name='Bar', age=1050348248}
Thread-0 Person{name='Bar', age=1050348248}
main Person{name='Baz', age=-803476628}
Thread-0 Person{name='Baz', age=-803476628}
Thread-0 Person{name='Baz', age=-803476628}
Thread-0 Person{name='Baz', age=-803476628}
main Person{name='Foo', age=-293422591}
Thread-0 Person{name='Foo', age=-293422591}
Thread-0 Person{name='Foo', age=-293422591}

ThreadSafetyViolationObjectReference.java

package com.github.stantonk.java_sandbox;

import java.util.Random;

public class ThreadSafetyViolationObjectReference {
    public static class Person {
        public String name;
        public Integer age;

        public Person(String name, int age) {
            this.name = name;
            this.age = age;
        }

        @Override
        public String toString() {
            final StringBuilder sb = new StringBuilder("Person{");
            sb.append("name='").append(name).append('\'');
            sb.append(", age=").append(age);
            sb.append('}');
            return sb.toString();
        }
    }

    public static void main(String[] args) {
        Person p = new Person("Init", 0);

        // This thread demonstrates 
        Thread thread = new Thread(() -> {
            while (true) {
                // notice, p is now shared across threads! mutations in the
                // main thread will be visible in this thread as well
                System.out.println(String.format("%s %s", Thread.currentThread().getName(), p));
                sleep(1000);
            }

        });
        thread.setDaemon(true);
        thread.start();

        String[] names = {"Foo", "Bar", "Baz"};
        int i = 0;
        while (true) {
            sleep(3000);
            p.name = names[i];
            p.age = new Random().nextInt();
            System.out.println(String.format("%s %s", Thread.currentThread().getName(), p));
            i = (i % 2 == 0 && i != 0) ? 0 : i + 1;
        }

    }

    private static void sleep(long millis) {
        try {
            Thread.sleep(millis);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}