Given: 10. interface A { void x(); } 11. class B implements A { public void x() { } public voidy() { } } 12. class C extends B { public void x() {} } And: 20. java.util.List list = new java.util.ArrayList(); 21. list.add(new B()); 22. list.add(new C()); 23. for (A a:list) { 24. a.x(); 25. a.y();; 26. } What is the result? 1 Compilation fails because of an error in line 25. 2 The code runs with no output. 3 An exception is thrown at runtime. 4 Compilation fails because of an error in line 20.

3 Answers  

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what is polymorhism what is inheritance? what is Abstract n Interface? what if two interfaces have same method and a concrete class is implementing both the interfaces. Will there be a compilation error? What are mutable and immutable classes? How can u make a class mutable? when will u use dem ...explain with example? what is overriding and overloading? what is garbage collection? what is Thread? how do dey communicate? what are the different ways of implementing ? have u used any messaging technologies? what is synchronization? what are some additions in java 1.5? what are generics? whst is advanced for loop? what is finally block? can u have a try in finally? yes!! can u have a finally in finally? how do you write junits? when is a object eligible for garbage collection?explain? a = null and b has ref to a will b be eligible to be garbage collected? sql questions like diff joins? how do dey work? exception handling? what is marker interface? what is the need??

0 Answers   JPMorgan Chase,

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Which is bigger float or double java?

0 Answers  

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what is d difference between deep cloning and shallow cloning in core java?

3 Answers   Satyam,

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Can constructor be protected in java?

0 Answers  

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Explain how to force the garbage collection in java.

0 Answers  

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explain copyonwritearraylist and when do we use copyonwritearraylist?

0 Answers  

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What are the types of web technologies?

0 Answers  

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When we can access the static data member without creating the object what is the need of the object in java.

5 Answers   Airhub, ssinformatics,

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How to find the size of an array a)array.length() b)array.length c)array.size() d)array.size

6 Answers   Accenture,

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What is tostring () method?

0 Answers  

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Why is logger singleton?

0 Answers  

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