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| Ans. Polymorphism means the condition of occurring in several different forms. Polymorphism in Java is achieved in two manners 1. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas 2. Dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding. | ||||
 Sample Code for overloading Sample Code for overriding | ||||
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| Ans. Java doesn't support multiple inheritance. Interfaces does't facilitate inheritance and hence implementation of multiple interfaces doesn't make multiple inheritance. | ||||
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| Discuss Correct / Improve java oop oop concepts inheritence multiple inheritence basic interview question Asked in 10 Companies basic frequent | ||||
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| Ans. class A { void test() { System.out.println("test() method"); } } class B { void test() { System.out.println("test() method"); } } Suppose if Java allows multiple inheritance like this, class C extends A, B { } A and B test() methods are inheriting to C class. So which test() method C class will take? As A & B class test() methods are different , So here we would Facing Ambiguity. | ||||
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| Ans. DEBUG ERROR ALL WARN INFO FATAL OFF TRACE TRACE_INT WARN | ||||
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| Ans. log4j is by apache while java logging api is given by sun. log4j is more powerful,extensible and simple to use than java logging api. | ||||
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| Ans. There was no multiple inheritance in java before version 8 as implementing multiple interfaces cannot be termed as inheritance. With Java 8 , came the concept of default methods wherein the class implementing the interface carries the default implementation from the interface and hence facilitating multiple inheritance. | ||||
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Static Polymorphic in Java is achieved through .. 
