CJ-2 : Welcome Program-Window Application

For a complete list, click JAVA

Refer Introduction to JAVA before going through your first program.

And for theory part , refer "Some Theory Part in JAVA"

=========================================================================
class firstprogram
{
public static void main(String args[ ])
{
System.out.println("Hai...Welcome...");
}
}

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

• Here, firstprogram is the program name.(See, class firstprogram ).The name after declaring the class , is the program name.We have to use the same name , while saving.
• Also note the capital letters of the words String and System. They are case sensitive.

Instead of typing the program  in NOTEPAD or DOS prompt , here , we are using some softwares like NETBEANS or ECLIPSE etc..

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(A) : Familier with NETBEANS platform:

Download NetBeans IDE 

Download NetBeans from here for free. (You need JDK or Java Development Kit for installing NetBeans . If you have no Java platform on your system , download from here (which contains JDK+NetBeans ) .

When clicking this , we get  :

We will get a window as shown below :

Click ; File--> New Project.

Then we can see,

Select JAVA from Categories;  and JAVA APPLICATION from Projects.

Click , Next .

Then , another window will appear as : 

Give a project name , and click Finish.

Then we can see the NetBeans IDE for typing the program.It will look like ;

In our program , we need to type the last println statement only.

The sentenses like /**/  does not tken by the Compiler.So, no need to bother about the extra sentenses you see there.

After typing the println statement to display "Hai....Welcome..." , we have to run it.

right click on the page , and select Run the File , from the drop down menu( or , select from the main menu....or , you can use ShiftF6).

The output will displayed in the bottom....as ; 

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(B) : Familier with ECLIPSE platform:

When clicking this , we get  :  

After giving the details as done before , we can see the Eclipse IDE for typing the program.
I just did the programs and you can see the output there.
(It is also more or less same as NETBEANS , so i just skip the steps for taking the Eclipse IDE here....)

CJ-1 : Welcome Program-Consol Application

For a complete list, click JAVA

Refer Introduction to JAVA before going through your first program.

And for theory part , refer "Some Theory Part in JAVA"

=========================================================================
class firstprogram
{
public static void main(String args[ ])
{
System.out.println("Hai...Welcome...");
}
}

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

• Here, firstprogram is the program name.(See, class firstprogram ).The name after declaring the class , is the program name.We have to use the same name , while saving.
• Also note the capital letters of the words String and System. They are case sensitive.

Type this program in NOTEPAD.

Then , save the program in the same folder , in which the JAVA software is installed.

Here, I installed the JAVA in C disk , jdk 1.3 is the version and bin is the directory.

So , the path is C:\jdk1.3\bin .

(Note the path of the JAVA of your computer.So dont blindly follow the path I described :)

Note the path in above picture.

And it saved as firstprogram.java .

Next, open DOS .

Choose the path in which JAVA is installed..

To do this , follow the steps given.

1. Type cd\ and press entre . Then we get C:\>
2. Now choose the directory in which JAVA is installed. Here , my path is jdk 1.3\bin. So, type cd jdk1.3\bin .Then we get , C:\jdk1.3\bin>
3. Now , compile the program , by typing, javac followed by program name. Here, our program name is firstprogram . Dont forget to put the extension .JAVA  . That is we have to type , javac firstprogram.java
4. Then Run the program by typing , java followed by program name . That is , java firstprogram.

Then we get the result : Hai...Welcome...

 See the picture below : 

(You can save the JAVA programs in any of the Directory you want , but you havr to give the JAVA installed directory thereafter , using the path command.That is ,

1. First choose the program directory in DOS prompt.
2. Then choose the JAVA installed directory , followed by path command.

That is , after giving the location of your program path , type : 

path jdk1.3\bin>

Then compile and run the program.

How to use DOS platform to type\save\edit JAVA:

1. Type cd\ and press entre . Then we get C:\>
2. Now choose the directory in which JAVA is installed. Here , my path is jdk 1.3\bin. So, type cd jdk1.3\bin .Then we get , C:\jdk1.3\bin>
3. Now type , edit followed by the program name.java ( Here, edit firstprogram.java )

Then we can see ;

We can edit the same NOTEPAD program in DOS prompt too...

If we give a new name , then we can type new program in that DOS prompt, then SAVE it in the JAVA directory as told before .

File--> Exit will return to the normal DOS prompt.