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"

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

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• 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.