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 are the 8 primitive data types in java?

0 Answers  

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what do you mean by classloader in java?

0 Answers  

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Is java supports multiple inheritance? explain?

12 Answers   BUET, Inforica,

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Why is inheritance used in java?

0 Answers  

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What methods are used in Servlet?Applet communication?

0 Answers   Satyam,

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What are the difference between string, string builder, and string buffer in java?

0 Answers  

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What is the life cycle of an Applet ?

1 Answers  

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my method "abc" return array of interface "xyz" and "pqr" is abstract class implements abc and class "jkl" extends pqr My problem 1) when i call abc it retrun array xyz how can i do this hint xyz refer_xyz = new jkl(); but i can't create array. 2)I want to access method of jkl using reference of xyz??

1 Answers  

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Does java support Operator Overloading?

0 Answers   Flextronics,

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Difference between local and global transaction ?

1 Answers   Accenture, iFlex,

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How to implement Singleton

6 Answers   DELL,

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