Java Programming

Actually java is not purely object oriented.because we can use the primitive data types in Java.In java all those things or considered as classes and objects .So we are called java is an object oriented programming language...

JDBC mean Java Database Connectivity. In java, using JDBC drivers, we can connect to database.

Steps to connect to JDBC.

1) Load the driver, using Class.forName(DriverName);

2) Get the connection object, Connection con = Driver.getConnection(loaded driver name);

3) Create a SQL statement, Statement s = con.createStatement();

4) Create Resultset object using the statement created above, ResultSet rs = s.executeQuery("sql statement");

Iterate the result set to get all the values from the database.

Finally don't miss this

5) s.close();

6) con.close() ;

The ability to make changes in your code without breaking the code of all others who use your code is a key benefit of encapsulation. You should always hide implementation details. To elaborate, you must always have your variables as private and then have a set of public methods that others can use to access your variables. Since the methods are public anyone can access them, but since they are in your class you can ensure that the code works the way that is best for you. So in a situation that you want to alter your code, all you have to do is modify your methods. No one gets hurt because i am just using your method names in my code and the code inside your method doesnt bother me much.

I have no idea. Was going to ask you the same question...An instance method represent the behavior of an object

import java.util.Scanner;

class LargestOfThreeNumbers

{

public static void main(String args[])

{

int x, y, z;

System.out.println("Enter three integers ");

Scanner in = new Scanner(System.in);

x = in.nextInt();

y = in.nextInt();

z = in.nextInt();

if ( x > y && x > z )

System.out.println("First number is largest.");

else if ( y > x && y > z )

System.out.println("Second number is largest.");

else if ( z > x && z > y )

System.out.println("Third number is largest.");

else

System.out.println("Entered numbers are not distinct.");

}

}

The Scanner class alows users to enter data. Example:

import java.util.Scanner

Scanner scan = new Scanner (System.in);

String input;

System.out.println ("Enter a word or phrase.")

input = scan.nextLine ();

System.out.println ("You entered: " + input);

Loops can be used to iterate or walk through an array. For example, suppose you have an array already initialized (we'll call it "array"):

int target = -1;

for (i=0; i < array.length(); i++){

if (array[i] = target){

//do something

}

}

Here, we will walk through an array (note that arrays are zero indexed) using a loop to make sure we hit each element of the array. In our loop, we start at the head (or first element) and iterate over each element.

Error: Any departure from the expected behavior of the system or program, which stops the working of the system is an error.

Exception:Any error or problem which one can handle and continue to work normally.

Note that in Java a compile time error is normally called an "error," while a runtime error is called an "exception."

Errors don't have subclasses while exception has two subclasses, they are compile time exception or checked exception (ClassNotFound Exception, IOException, SQLException etc.) and runtime or unchecked exception(ArrayIndexOutOfBounds Exception, NumberFormat Exception).

An Abstract class is a way to organize inheritance, sometimes it makes no since to implement every method in a class (i.e. a predator class), it may implement some to pass to its children but some methods cannot be implemented without knowing what the class will do (i.e. eat() in a Tiger class). Therefore, abstract classes are templates for future specific classes.

A disadvantage is that abstract classes cannot be instantiated, but most of the time it is logical not to create a object of an abstract class. heloooooo

The whole idea of Java - or one of the ideas, at any rate - is that it can be run anywhere. So, instead of compiling for a specific processor, the Java compiler compiles for a "generic processor", called the Java Virtual Machine. The code thus generated is called "bytecode". It can be interpreted (i.e., run) by a Java Virtual machine, these are available on different platforms.

The whole idea of Java - or one of the ideas, at any rate - is that it can be run anywhere. So, instead of compiling for a specific processor, the Java compiler compiles for a "generic processor", called the Java Virtual Machine. The code thus generated is called "bytecode". It can be interpreted (i.e., run) by a Java Virtual machine, these are available on different platforms.

The whole idea of Java - or one of the ideas, at any rate - is that it can be run anywhere. So, instead of compiling for a specific processor, the Java compiler compiles for a "generic processor", called the Java Virtual Machine. The code thus generated is called "bytecode". It can be interpreted (i.e., run) by a Java Virtual machine, these are available on different platforms.

The whole idea of Java - or one of the ideas, at any rate - is that it can be run anywhere. So, instead of compiling for a specific processor, the Java compiler compiles for a "generic processor", called the Java Virtual Machine. The code thus generated is called "bytecode". It can be interpreted (i.e., run) by a Java Virtual machine, these are available on different platforms.

A data type of an object describes the kind of information stored in that object. Numbers, strings, images, and all other information in a program is described by some sort of data type.

a Java application is a program written with the very popular porgramming language (Java). the Java programs can run on any operating system (windows,linux,mac...etc) and also it can be run on mobile devices too. in order to the java application to run,it needs to have JRE(Java Runtime Enviroment)installed on the device that it will run on.

No, Java only allows a method to be defined within a class, not within another method.

Yes you can and they are known as inner methods. You can even delcare an inner class and methods on it. However, if you want your classess accessible from multiple programs (reusability), then you should not use this practice. This type of facility is useful when you know for sure that your class or method is going to be used only once.

It is a happening, the result of an action or an item in a programme

Here's a Hello World application:

import static java.lang.System.out;

class HelloWorld

{

public static void main(string[] arguments)

{

out.println("Hello world!") //this will print out the words 'Hello world!' to the screen

} //End of main method

} //End of class HelloWorld

This section demonstrates you the use of DataInputStream class.

The class DataInputStream allows to read primitive Java data types from an underlying input stream. It reads the file line by line.

Use the word "final" directly preceding your method declaration. The presence of final keyword directs java to ensure that, this particular method would not be overridden by any of its child classes.

Java itself is freely distributed. You may have to pay for programs written in Java, however.

== == === === === === === === Some Body told me that operator overloading is not there because it violates the transparency of java.since there is no hiding of information in java it does support op overloading

=== === === === === === Pranab Kumar Rana

Software Engineer.....

=== === === ===

Two methods can have the same signature when you override a method. A superclass calledrectangle might have a method called draw(). Then you make a subclass called squareand give it a method called draw() also. When you call the draw() method from square, it overrides the draw() method in rectangle. Note this is different than overloading, where you have two methods with the same name but different signatures, like draw() and draw(Color c).

Try this for a very, very simple face....

String hair = " /////// ";

String eyes = " | o o | ";

String noseEars = "(| ^ |)";

String mouth = " | [ ] | ";

String chin = " ------ ";

System.out.println(hair); //prints out the hair

System.out.println(eyes); //prints out the eyes

System.out.println(noseEars); //prints out the nose and ears

System.out.println(mouth); //prints out the mouth

System.out.println(chin); //prints out the chin