public class Person {
    String name;
    int age;
    
    Person(String name) {
        this.name = name;
        this.age = 42;
    }

    public static void main(String[] args) {
        System.out.println(new Person("Bob").toString());
        System.out.println(new Person("Alice", 30).toString());
        System.out.println(new Person("Fred").toString(true));
        System.out.println(new Person("Jon").toString(true));
        System.out.println(new Person("Sean", 50).getName());
        
        Person p = new Person("Sean", 50);
        System.out.println(p.getAge());
        p.setAge(51);
        System.out.println(p.getAge());
        
        class Dog {
            String name;
            boolean isGood;

            Dog(String name, boolean isGood) {
                this.name = name;
                this.isGood = isGood;
            }
            
            @Override
            public String toString() {
                return String.format("%s %b", name, isGood);
            }
        }
        
        Dog dog = new Dog("Rex", true);
        System.out.println(dog.toString());
    }
    
    Person(String name, int age) {
        this.name = name;
        this.age = age;
    }
    
    public Person(String name, boolean isPointer) {
        if (isPointer) {
            this.name = name;
            this.age = 42;
        }
    }

    public int getAge() {
        return this.age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return this.name;
    }
    
    @Override
    public String toString() {
        return String.format("%s %d", name, age);
    }
}