How many methods in the Serializable interface?

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There is no method in the Serializable interface. The Serializable interface acts as a marker, telling the object serialization tools that your class is serializable.

2012-05-28, 2516👍, 0💬

How many methods in the Externalizable interface?
How many methods in the Externalizable interface? There are two methods in the Externalizable interface. You have to implement these two methods in order to make your class externalizable. These two methods are readExternal() and writeExternal(). 2012-05-29, 2581👍, 0💬

How are Observer and Observable used?
How are Observer and Observable used? Objects that subclass the Observable class maintain a list of observers. When an Observable object is updated, it invokes the update() method of each of its observers to notify the observers that it has changed state. The Observer interface is implemented by obj... 2012-05-31, 2575👍, 0💬

How many methods in the Serializable interface?
How many methods in the Serializable interface? There is no method in the Serializable interface. The Serializable interface acts as a marker, telling the object serialization tools that your class is serializable. 2012-05-28, 2517👍, 0💬

What is a transient variable?
What is a transient variable? A transient variable is a variable that may not be serialized. If you don't want some field to be serialized, you can mark that field transient or static. 2012-05-30, 2516👍, 0💬

What is the difference between Serializalble and Externalizable interface?
What is the difference between Serializalble and Externalizable interface? When you use Serializable interface, your class is serialized automatically by default. But you can override writeObject() and readObject() two methods to control more complex object serailization process. When you use Extern... 2012-05-29, 2515👍, 0💬

How to define an Abstract class?
How to define an Abstract class? A class containing abstract method is called Abstract class. An Abstract class can't be instantiated. Example of Abstract class: abstract class testAbstractClass { protected String myString; public String getMyString() { return myString; } public abstract string anyA... 2012-05-24, 2452👍, 0💬

Is Iterator a Class or Interface? What is its use?
Is Iterator a Class or Interface? What is its use? Iterator is an interface which is used to step through the elements of a Collection. 2012-05-23, 2437👍, 0💬

If a class is located in a package, what do you need to change in the OS environment to be able to use it?
If a class is located in a package, what do you need to change in the OS environment to be able to use it? You need to add a directory or a jar file that contains the package directories to the CLASSPATH environment variable. Let's say a class Employee belongs to a package com.xyz.hr; and is located... 2012-05-28, 2401👍, 0💬

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