INTERVIEW QUESTIONS J2EE JAVA DETAILS

Question: Which class is extended by all other classes?

Answer: The Object class is extended by all other classes.

The Object class is extended by all other classes. Source: CoolInterview.com

the parent class or base class is extended by other classes. Source: CoolInterview.com

A Singleton is a class which at any given time has only one
instance and it does not allow more instances to be created.
Such classes do not have an accessible constructor, for example:

public class Singleton {
// class is automatically instantiated when the
// class is loaded
private static Singleton instance = new Singleton()

// constructor is made inaccessible by declaring
// it private
private Singleton() { ... }

// Access to the single instance of the class is
// provided by a static accessor method
public static Singleton getInstance() {
// returns a reference of the private instance
return instance;
}

// rest of the class implementation
} Source: CoolInterview.com

Object class Source: CoolInterview.com

Object class is the class which is extended by all other class.it is under the Java.lang.There is no need to import it(Bydefaultit is imported).so it is not clear by observing a simple code whether object class is extended or not. Source: CoolInterview.com

Object class is inherited by all the subclasses.it is the super class of every class we create.It is imported by default. Source: CoolInterview.com

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