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on September 21, 2015

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How to create Object in JAVA? In Different way?

Question is: How many Ways to create an object in java? Or what is the difference between new keyword or newInstance()? There Is Two way to create an object in java. usually, programmer or developer use the new keyword to create an object. so, how can use it let's check? 1 ) Using new Keyword : suppose one class is Test class so let us create an object of class Test objT = new Test(); Here Above In that Test is class name and objT is object name = using assignment operator and new keyword and Test() were a constructor. ok, so it's very easy to create an object. ok, so here we know that Test class is there in my java file. and we use to perform an operation. But, At run time how to create and you don't know class name at beginning. so that time you using newInstance() to create an object. 2 ) newInstance(): When you don't know class name at beginning or runtime you want to create an object of class so we can yous newInstance(). ex. ...

Throw and Throws keyword in Java.

In interview room most probably asking the question. Throw keyword: First, Forget about java all this thing For example Suppose I want to throw then someone going to catch. assume that here it's a ball game. and I throw the ball to catch someone person, were in java the person who throw the ball is the programmer and the other person catching that exception by JVM for that throw keyword is required. where which is throwable type is only thrown the exception, no other object or class you may throw. Look like.. Let us explain with an example. class Test{ public static void main(String args[]){ System.out.println(10/0); } } exception in thread main java.lang.arithmaticException / by zero at Test.main() In this case, which is the responsible for exception arise. JVM, JVM is responsible for exception handling. it's responsible internally automati...

Object class method in Java?

In Interview room most probable asking question is which is object class method? basic we all know about object & class. and we all knows. but it's simple question and your using everyday in programming but at time you can't handle. it's very easy question. Object class Method 1 ) clone() - If you want to create a copy of class so that use close() method. it's return create and return copy of class. 2 ) equals() - Some other object equal to this one. so you can use equals(). 3 ) finalize() - called by garbage collector and object when garbage collection determines that there are no more reference to the object. all-ready discuss about finalized() method in my daily post. 4 ) getClass() - return runtime class of the object. 5 ) hashCode() - return the hashcode value of object. 6 ) notify() - weak up a single thread that is waiting on this object monitor. 7 ) notifyAll() - weak up all threads that are waiting on this objects m...

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