Solution Review: Declaring Class Attributes

/*
Member variables can be declared inside class, but outside any method
There are four types of access modifiers
1) public = it is available in package, subclass, and outer world
2) protected = it is available in package, subclass, and not in the outer world
3) private = it is not available in package, subclass, and outer world
4) default (no modifier) = it is only available in package
*/
/*
In this program we will check the access modifiers individually
*/
class FatherPanda {
    public boolean isPredator;
    protected int weight;
    private int age;
    public void eat() {
        System.out.println("After each meal, Father Panda gains weight: " + weight);
        System.out.println( "His age is: " + age);
    }
}
public class ClassChallenge {
    public static void main(String [] args) {
        FatherPanda father = new FatherPanda();
        // father.isPredator = true;
        System.out.println("Is father panda predator. " + father.isPredator);
        father.weight = 5;
        father.eat();
        // we cannot modify private member variable this way, it  will give error
        // father.age = 10;
    }
}