Java Programming - Declarations and Access Control - Discussion
Discussion Forum : Declarations and Access Control - General Questions (Q.No. 9)
9.
Which three are valid method signatures in an interface?
- private int getArea();
- public float getVol(float x);
- public void main(String [] args);
- public static void main(String [] args);
- boolean setFlag(Boolean [] test);
Answer: Option
Explanation:
(2), (3), and (5). These are all valid interface method signatures.
(1), is incorrect because an interface method must be public; if it is not explicitly declared public it will be made public implicitly. (4) is incorrect because interface methods cannot be static.
Discussion:
14 comments Page 1 of 2.
Harshal said:
7 years ago
With java 9 even private methods are allowed in interface.
(2)
TastyBean said:
10 years ago
I thought we can use static methods in interface in java 8 now, you need to update this answer if I am right.
(1)
Suganthisakthivel said:
8 years ago
Why is the Boolean type method correct? I think the interface methods all have a public type but the 5 have Boolean, I want a full explanation.
(1)
Saif Ali said:
7 years ago
Yes, you can use public static void main(string ar[])
in the interface but it only works as a starting point of that particular interface.
Not as a class psvm both are different.
in the interface but it only works as a starting point of that particular interface.
Not as a class psvm both are different.
(1)
Deepak said:
1 decade ago
What a difficult language is this java?
Ashvin said:
1 decade ago
Can any one tell that do we generally put psvm in an interface?
Adithya said:
1 decade ago
Hi,
Let me know if we can declare main method in an interface ?
Let me know if we can declare main method in an interface ?
Mohammed Refeekh said:
1 decade ago
Can have a interface method protected or default?
Amaziane said:
1 decade ago
We can't have a protected interface in java, but default yes, and default means implicitly public access.
Amaziane said:
1 decade ago
Main method in this example doesn't mean the main method of class, it means just a simply and normally method with name main because main isn't a reserved keywords.
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