What is the covariant return type?

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What are the topics in advance java?

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What is an example of a keyword?

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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 do you generate random numbers in java?

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Why we use static and synchronized in method for single thread model example: public static synchronized add(){}

2 Answers  

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I have one Shopping cart application, i that i have selected some items, while clicking submit button by mistake i have clicked twice or trice, that time items are selected twice or trice. Actually i want only one copy of items but its selected twice or trice. So how can we avoid this problem?

2 Answers   Honeywell,

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How many bits is size_t?

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Can you sort a string in java?

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Given a singly linked list, how will you print out its contents in the reverse order? Can you do it with consuming any extra space?

0 Answers   Akamai Technologies,

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What is logical variable?

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What is java class writing rules?

1 Answers   Oracle,

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