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What are constants?
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What are generic methods?
What is the difference between C++ & Java?
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What is the purpose of an interface?
In Java, what types of classes perform inheritance?
How is abstraction implemented in java ?
What is the difference between equals() and == in java?
When should I use a singleton?
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.
WHAT IS THE SCOPE FOR COREJAVA...? IS JAVA ONLY CORE JAVA ?
What is the use of an interface?
Why is an interface be able to extend more than one interface but a class can’t extend more than one class?
How is hashcode calculated in java?
Core Java 
