java-design-patterns/src/Proxy.java at master · BrianHuf/java-design-patterns · GitHub

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class Person {
    private int age;

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

    public int getAge() {
        return age;
    }

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

    public String drink() {
        return "drinking";
    }

    public String drive() {
        return "driving";
    }

    public String drinkAndDrive() {
        return "driving while drunk";
    }
}

class ResponsiblePerson {
    private Person person;

    public ResponsiblePerson(Person person) {
        this.person = person;
    }

    public int getAge() {
        return person.getAge();
    }

    public void setAge(int age) {
        person.setAge(age);
    }

    public String drink() {
        if (person.getAge() < 18) {
            return "too young";
        }
        return person.drink();
    }

    public String drive() {
        if (person.getAge() < 16) {
            return "too young";
        }
        return person.drive();
    }

    public String drinkAndDrive() {
        return "dead";
    }
}