what are the diffrences between interface and abstract class?

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List java api that supports threads?

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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 'finally' method in Exceptions?

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In the below example, what will be the output?

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What is a local class in java?

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Can you have an inner class inside a method and what variables can you access?

2 Answers  

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Which is easier netbeans or eclipse?

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What is dynamic binding(late binding)?

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How is a structure different from array ?

0 Answers   Amdocs,

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What is the importance of hashcode() and equals() methods?

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What is the purpose of using bufferedinputstream and bufferedoutputstream classes?

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