What is an interface in java?

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hr interview how many minutes asking question

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there are some duplicate values in ArrayList, how U'll get that array with out duplicate?

4 Answers   CMC,

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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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How many times garbage collector will invoke an object?s finalize() method?

4 Answers  

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what is the output??????? public class multireturn { public(int assign x ( int x) { if(4==x) { return 7; } else if (7=x+3) { return 6; } return 5; } }

3 Answers   TCS,

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What are keywords in programming?

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Give any two differences between C++ and java.

0 Answers   GrapeCity,

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What happens if an exception is not handled in a program?

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what is unreachable code problem in multiple catch statements

3 Answers  

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How we can generate random numbers in java?

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What is a methodologist?

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