What is preflight request?
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What are the methods available in a class?
Lowest Common ancestor in a Binary Search Tree and Binary Tree.
What is use of static method?
Same common question what is Map,Set,HashMap,List????
Can you explain the difference b/n abtract and interface with a good example,?In what cases we have use abtract and what case interface?
what is ejb? what is the importance of ejb?
What is scope & storage allocation of global and extern variables? Explain with an example
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 static and final keyword in java?
Why string is immutable with example?
What is the purpose of the File class?
Are variables stored in ram?