What is Mutex (Mutual Exclusion Object) ?
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What is jrmp?
Difference between a process and a program?
Can we use different return types for methods when overridden?
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.
Explain the Propertie sof class?
What is the order of method invocation in an Applet?
Can we change the value of static variable?
How to run a JAR file through command prompt?
Is it possible to create Userdefined Unchecked Exception also?If Yes, give an example?
What are java packages? What is the significance of packages?
how to create multithreaded program? Explain different ways of using thread? When a thread is created and started, what is its initial state? Or extending thread class or implementing runnable interface. Which is better? : Java thread
Is static a keyword in java?