Hi Friends, I am new to java. Can u explain about thread concept.How i know one thread is locked, and how can i force or acquire another thread for lock . Finally how to know thread is released from lock. Explain types of lock(like method level and block level) in thread.

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Why is inheritance used in java?

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Why do we use public static with the main function in Java?

13 Answers   College School Exams Tests, Infosys,

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Can a singleton class be inherited?

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Suppose there is an array list [10,5,20,19,15,24].Print them in ascending & descending order in collection framework concept ???

2 Answers   Cognizant,

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Why do I need to declare the type of a variable in java?

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How we can generate random numbers in java?

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What is set in java?

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what are synchronized methods and synchronized statements? : Java thread

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What is consumer interface?

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What is the size of a string in java?

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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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