CODEWITHSUNDEEP
java
Aayush
Aayush

Reputation: 1254

Has -A Relationship in java

public class Horse extends Animal {
    private Halter myHalter = new Halter();
    public void tie(LeadRope rope) {
        myHalter.tie(rope); // Delegate tie behavior to the
      // Halter object
    }
}

public class Halter {
    public void tie(LeadRope aRope) {
    // Do the actual tie work here
}
}

In this example Horse has-a Halter.Can we call myHalter.tie(rope); like this:

public class Horse extends Animal {
    private Halter myHalter = new Halter();

        myHalter.tie(rope); // Without using the public void tie method

}

It gives an error. My explanation to this is that its not a main() method but could anyone explain it in a better way.

Upvotes: 0

Views: 896

Answers (3)

Juvanis
Juvanis

Reputation: 25950

Statements other than variable/field declarations in a class body must be put into a method body, a constructor or an initializer block. For example, it would be OK if you attempt to compile this code:

public class Horse {

    private Halter myHalter = new Halter();

    {
       myHalter.tie(new LeadRope());
    }
}

Upvotes: 1

Kumar Vivek Mitra
Kumar Vivek Mitra

Reputation: 33534

Ok try this....

- Has-A relationship is known as Composition.

public class Bathroom{

 Tub tub;


}


public class Tub{



}

- We can say that Bathroom has a reference of type Tub, that means Bathroom has an instance variable of type tub.

Upvotes: 1

zaffargachal
zaffargachal

Reputation: 810

You cant call method in class block , you have to create a method and than you can call a method in the body of a method, or you can call a method in static, instance or constructor block

Upvotes: 1

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