The serialization is a kind of mechanism that makes a class or a bean persistence by having its properties or fields and state information saved and restored to and from storage.

By implementing either the java.io.Serializable interface, or the java.io.Externalizable interface. As long as one class in a class's inheritance hierarchy implements Serializable or Externalizable, that class is serializable.

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.

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().

Constructing a StringIf you are constructing a string with several appends, it may be more efficient to construct it using a StringBuffer and then convert it to an immutable String object.StringBuffer buf = new StringBuffer("Initial Text");// Modifyint index = 1;buf.insert(index, "abc");buf.append("def");// Convert to stringString s = buf.toString();Getting a Substring from a Stringint start = 1;int...

String string = "aString";// First occurrence.int index = string.indexOf('S'); // 1// Last occurrence.index = string.lastIndexOf('i'); // 4// Not found.index = string.lastIndexOf('z'); // -1

// Replace all occurrences of 'a' with 'o'String newString = string.replace('a', 'o');Replacing Substrings in a Stringstatic String replace(String str,String pattern, String replace) {int s = 0;int e = 0;StringBuffer result = new StringBuffer();while ((e = str.indexOf(pattern, s)) >= 0) {result.append(str.substring(s, e));result.append(replace);s = e+pattern.length();}result.append(str.substring(s));return...

Consider the following bean: package bar;public class FooBean {public FooBean(SomeObj arg) {...}//getters and setters here}The only way you can instantiate this bean within your JSP page is to use a scriptlet. For example, the following snippet creates the bean with session scope:&l;% SomeObj x = new SomeObj(...);bar.FooBean foobar = new FooBean(x);session.putValue("foobar",foobar);%> You can...

How to introduce ourselves and what is the format for self introduction ?

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By using the static method there is no need creating an object of that class to use that method. We can directly call that method on that class. For example, say class A has static function f(), then we can call f() function as A.f(). There is no need of creating an object of class A.

nagagopal

 Profile Answers by nagagopal Questions by nagagopal

• Oct 17th, 2006

Static methods are class methods. in which we can use only static data varibles of any calss of the program. these methods are invoke with out create objects of corresponding the class.

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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 Externalizable interface, you have a complete control over your class's serialization process.

Srinivasa Rao Yenti

• Dec 15th, 2005

Java gives you control over the serialization process through the java.io.Externalizable interface. The java.io.Externalizable interface extends the java.io.SerialiJava gives you control over the seri...

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aakash arora

• Oct 8th, 2013

I mostly prefer reading the books which are off the track. You can call it creative in a sense.

Thrillers are mostly preferred because it require blood to rush across my mind.

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Polymorhism: is a feature of OOPl that at run time depending upon the type of object the appropriate method is called.Inheritance: is a feature of OOPL that represents the "is a" relationship between different objects(classes). Say in real life a manager is a employee. So in OOPL manger class is inherited from the employee class. Encapsulation: is a feature of OOPL that is used to hide the information.

subash

• Aug 6th, 2011

Polymorphism: it is used to derive the class one in many form
inheritance: deriving the neq class from the existing class
encapsulation: hiding the information

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SELECT Student.name, Student.SIDFROM Student, LevelWHERE Student.SID = Level.SIDAND Level.Level = "freshman"AND Student.Course = 3;

Asheesh pandey

• Dec 26th, 2005

I think this is the right answer of the above query:SELECT Student.name, Student.SID FROM Student, LevelWHERE Student.SID = Level.SIDAND Level.Level = "freshman"AND Student.Course = 3;

Behnam

• Dec 10th, 2005

select Name,SID from student where Course=3 and SID in ( select SID from Level where Level='freshman' )

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Class ABC{static final float GRAVITATIONAL_CONSTANT = 9.8;public void getConstant(){system.out.println("Gravitational_Constant: " + GRAVITATIONAL_CONSTANT);}}

manish

• Jan 16th, 2007

class abc{ final const float PI=3.14f;}

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Multiple inheritance is a feature in C++ by which one class can be of different types. Say class teachingAssistant is inherited from two classes say teacher and Student.

subashinikumar

 Profile Answers by subashinikumar Questions by subashinikumar

• Jun 3rd, 2008

A derived class if it inherits from more than one direct base class,it is call multiple inheritance.

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The operating system's task scheduler allocates execution time to multiple tasks. By quickly switching between executing tasks, it creates the impression that tasks execute sequentially.

subashinikumar

 Profile Answers by subashinikumar Questions by subashinikumar

• Jun 3rd, 2008

On a single processor, Multithreading generally occurs by time-division multiplexing ("time slicing") in very much the same way as the parallel execution of multiple tasks (computer multitas...

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The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented.

mx

• Dec 2nd, 2022

The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented.

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