class J1Lesson5 {

public static void main(String[] args) {

Cat cat = new Cat("Murzik", "black", 1);

cat.setColor(null);

System.out.println("Cat " + cat.name + " color " + cat.getColor() +

" age " + cat.age + " say " + cat.voice());

}

}

class Cat {

String name;

private String color;

int age;

Cat(String name, String color, int age) {

this.name = name;

this.color = color;

this.age = age;

}

void setColor(String color) {

if (color != null)

this.color = color;

}

String getColor() {

return color;

}

String voice() {

return "meow!";

}

}