Descriptive Question

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Submitted by heartin on Thu, 10/15/2015 - 00:44

QID:

Type:

Descriptive Question

Category:

Java Programmer I

Tags:

overloading

inheritance

Validated against:

java8

Question:

Predict the result:

public class NullOverloadCheck {

	static void myMethod(Float o)
	{
		System.out.println("Float");
	}
	
	static void myMethod(Integer i){
		
		System.out.println("Integer");
	}
	
	public static void main(String[] args)
	{
		myMethod(null);
	}
	
}

Answer and Explanation (Click to expand)

Answer:

Compilation will fail with message like: The method myMethod(Float) is ambiguous for the type NullOverloadCheck.

Explanation:

null is a valid value for the types Float and Integer; and both of the types are not related through inheritance. So Java will not be able to select one and hence it will fail at compile time.

Q&A Set:

Set X

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abstract classes
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decision constructs
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file upload
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inheritance
initializers
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Java Basic
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