Difference between revisions of "Java/C2/Hello-World-Program-in-Eclipse/English-timed"

|  Welcome to the spoken tutorial on '''HelloWorld in Java on Eclipse'''.

| In this tutorial,  we are going to learn,  how to write a simple '''Hello World'''program in '''Java '''using '''Eclipse.'''

|  For this tutorial we are using  Eclipse 3.7.0 and  Ubuntu 11.10

|  To follow this tutorial you must have Eclipse installed on your system.

|  And you must know how to create, save and run a file in Eclipse.

| If not, for relevant tutorial please visit our website as shown.

|  Here is a line of java code that prints the message '''Hello World'''

| Now let us try it on '''Eclipse'''.  

|  Press '''Alt''' ,'''F2''' and in the dialog box  type '''eclipse''' and hit '''enter'''.

| Click''' Ok''' at the workspace and here we have the Eclipse IDE.

|  Now let us add a '''new project'''.

|  click   '''File''',  '''New '''  and select '''Project '''  

|  In the list of project select '''Java Project '''  and click '''Next.'''

|  In the  project name ,Type '''DemoProject ''' (please note that their is no space between '''Demo''' and ''' Project''' D & P are in capital letters)   

| '''DemoProject ''' has been created.   

|Now let us add a new class to the project.

|'''Right click''' on the ''' Project ''',   '''New'''  select '''Class'''.

|  In the class name  type '''DemoProgram''' and in the method stubs select one that says''' Public Static Void main'''.  

| Click Finish at the bottom right corner of the wizard.

|  We can see that the''' DemoProject''' has the '''source directory''' and a file called '''Demo program.Java''',

|This is because every class in Java has to be in its own file. Hence the class Demo Program can exist only in the file ''' Demo program. Java'''

| We  can see that there is very little space for the editor  and the view looks blurred . Let us minimise the other portlets and here we have the editor .

|Notice that this line begins with two slashes which means this line is the comment and has nothing to do with our code.

|Let us remove this line. Similarly every thing that is in between '''slash Astrix ''', and '''Astrix slash '''  is also a comment

|So let us remove this comments also.

|Here we have the ''' bare bones ''' of the code.

|Notice that eclipse gives  a list of all the possible completions.

|For now we are going to type the command manually;

|'''Out.println'''. In brackets in quotes type, '''HelloWorld'''

|In java, Every statement  has   to   end with a semicolon.

|So let us add a semicolon.

|Here  these are complete '''HelloWorld''' program in ''' Java'''.

|Press '''Ctrl + S''' to save

|Right click   '''Run as''',  '''java application'''.'''Run''' the code  

|As  we can see on the output console, the message '''HelloWorld''' has been printed.

|Now let us change the ''' World''' to '''Java'''

|Save it with  '''Ctrl + S''' and '''Run''' it.

|As we can see, the message that is printed now is '''Hello Java'''

|The first line  indicates that the  class name is '''DemoProgram'''  and its a '''Public class'''

| The second line  indicates that  this is the '''main method'''. In other words the method from which execution starts with java.

|As we know this is a print statement.  

|And here is how we write  a  '''HelloWorld'''   program in ''''Java'''

|This brings us to the end of the   tutorial.

|In this tutorial we have learnt, how to write  a 'HelloWorld' program in java  and also  what each part of  code does in java code.

|As an  assignment for this tutorial.

| Create a java class by the name '''Greet'''  it should bring '''Program Successful''' when executed.

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