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 difference between perfom() & excute() ?

2 Answers   IBM,

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What are the main differences between the java platform and other platforms?

0 Answers  

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what is the diffrence between class and object?

5 Answers  

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What is token in java?

0 Answers  

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public class Garbage { int a=0; public void add() { int c=10+20; System.out.println(c); System.out.println(a); } public static void main(String args[]) { Garbage obj=new Garbage(); System.gc(); System.out.println("Garbage Collected"); obj.add(); } } Above is a code in java used for garbage collection. object obj has been created for the class Garbage and system.gc method is called. Then using that object add method is called.System.gc method if called the obj should be garbage collected?

6 Answers  

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Why java is said to be pass-by-value ?

0 Answers  

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describe synchronization in respect to multithreading? : Java thread

0 Answers  

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What are the differences between heap and stack memory?

0 Answers  

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What is a locale?

0 Answers   Aspire, Infogain,

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Can i have abstract class with no abstract methods?

22 Answers   CTS,

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how to handle http request in struts

2 Answers   Polaris,

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