Can we execute a program without main?

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Is it compulsory to have atleast one abstract method in abstract class?

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You're given a Boolean 2D matrix, can you find the number of islands?

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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.

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Without creating a new object, How you can retrieve a String or other object?

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What are the standards to place package statement within a source code file?

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What about anonymous inner classes in java?

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For class CFoo { }; what default methods will the compiler generate for you>?

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What is use of map in java?

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How many classes can any class inherit java?

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What is thread life cycle?

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Can you explain the private protected field modifier?

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