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Explain numeric promotion?
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Why string is called as immutable?
What are the basic concepts of OOPS in java?
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What is java in simple terms?
What data type is true or false?
Define Multiprogramming and Multiprocessing in java.
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When a byte datatype is used?
What is meant by JVM? Is JVM platform independent or not?
What is the Scope of Static Variable?
How do you use compareto in java?
What is serialVersionUID and what is its need?
What are autoboxing and unboxing? When does it occur?
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.
Core Java 
