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What is the purpose of hash code in Java?
rajesh
- Feb 28th, 2012
At the time of creating object constructor will be execute it will tell the size of memory to the JVM and JVM will tell to the heap manager and heap manager will create the memory at that time heap manager will create one unique id is called hash code
amrutabhavana
- Sep 4th, 2011
Hash code is nothing but byte code. The byte code produced in Java is independent of architecture. We can run this byte code in any platform. By this we can say that Java is platform independent.
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System is a class or a package?
class Test { public static void main(String... a) { System.out.println("hello world"); } } In the above code if we write "s" of String class in lowercase, it gives an error of class not found, but if we write "S" of "System" class in lower case it gives an error package not found. why?
amrutabhavana
- Sep 4th, 2011
System is class.it belongs to the lang package."System.out.println" means println is a method which is called by out object of system class.
Prabha
- Aug 10th, 2011
System is a class which is available in lang package and we need not to create object. When we give System as system compiler searches in the package and gives an error.
String is also a class and we can create objects to handle character strings and it is a reference datatype -
Use of Static
What is the use of static in (public static void main string args[])
amrutabhavana
- Sep 4th, 2011
We can use static key word for any method which does not require an object to call, so main method is automatically called by the JVM so it does not require any object it is mentioned as static. We ca...
Suresh
- Aug 6th, 2011
Without creating instance of that class to invoke the main method static keyword is used, by giving the name of the class main method gets invoked.
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What is meant by inheritance ? Explain with an example
Shahnoor Alam
- Aug 28th, 2017
Inheritance is an OOPS concept by which a class can acquire the characteristics of another class. The class that does the inheriting is called a subclass. Therefore, a subclass is a specialized version of a superclass.
amrutabhavana
- Sep 4th, 2011
Inheritance is acquiring properties of one class from another class, the class which is inherited is called base class and the class which acquir the properties is called derived class. eg: {geshibot...
