help!!

Hello, can someone help? This is my first real java program and I don't know how to do it. Here it is.
Write a standard program that takes any number of command line parameters and displays the number of (naturally occurring) lower-case es in all of them, combined.

[poochi]

public class FirstClass{

public static void main( String str[] ){
for( int i = 0 ; i < str.length ; i++ ){
System.out.println( str[i] );
}
}
}

[poochi]

public class FirstClass{

public static void main( String str[] ){
for( int i = 0 ; i < str.length ; i++ ){
System.out.println( str[i] );
}
}
}

[poochi]

In my Sample program , str is an array , so change the System.out line according to that.
here i could not able to specify the array. I dont know why.

Hi, thanks for your help! But, what I am having difficulty is to count the lower case letter 'e's in the strings and print out. Would you be able to help? Thanks again.

[poochi]

I am sorry , i didnt read your question properly.



public class FirstClass{
public static void main( String str[] ){
int naCount = 0;
for( int i = 0 ; i < str.length ; i++ ){
int nIndex = -1;
String tempString = str[i].toLowerCase();
while(( nIndex = tempString.indexOf( 'e' , nIndex+1 )) != -1 ){
naCount++;
}
}
System.out.println( naCount );
}
}





Put the brackets( [] ) in app. places. ( 6th line )

Hi, Pooch! Thank you very much for your information. I will try to complie it and let you know how I did it. I have another question for you. Here it is.

If the first parameter of this program starts with the switch ‘-f’ then write the result of the program to the file following the switch. (e.g.: test -fhello.txt Hello // result should be written to the file hello.txt) Do you think this can be done?

Thanks again, my friend.

[poochi]

Yes you can.. Give me some time .. i will post the source code ..

Thanks, Pooch. You are the best.

[poochi]

I am not the best :-)


import java.io.*;

public class ReadSaveFile{
public static void main( String[] str ){
if( ( str.length < 1 ) || ( str[0].indexOf( "-f" ) == -1 )){
System.out.println( "Usage : java ReadSaveFile -f< FileName > < Strings ...>" );
return;
}
int nIndex = str[0].indexOf( "-f" );
String tFileName = str[0].substring( nIndex + 2 , str[0].length() );
try{
PrintWriter pWriter = new PrintWriter( new FileOutputStream( tFileName ));
for( int i = 1 ; i < str.length; i++ )
pWriter.println( str[i] );
pWriter.close();
}catch( IOException e ){}
}
}





Check the Array notations.. This forum eats some of the array brackets...

Thank you for all your help, pooch. I will try out your code. By the way, the other one was great help. Thanks again. Please keep in touch. Would you like to exchange email address?

[poochi]

What do you mean "the other one" ?
My mail id is : sankar_s_74@yahoo.com
you are always welcom.

Hi, Pooch! I was refering to the FirstClass program that you wrote. It worked just fine. Thank you. But, the other one (ReadSaveFile) didn't save the correct result to the file. I got something like '[Ljava.lang.String;@f36eb39a' in the hello.txt file.

Let me give you an example, if you type 'test -fhello.txt Hello' at the command line, it should create a 'hello.txt' file and '1' should be written to the file. Because according to the FirstClass program, letter 'e' only occuring once in the text 'hello'. Do you know what I mean? Any help will be appreciated, Pooch. Thanks again.

[poochi]

Yes i can understand what you are saying ... This forum is eating some brackets in our code.
It seems u are writing the whole str array instead of each and every values in that array.

Check this line..
pWriter.println( str ) in my code ..

The array brackets are missing ... I has to be 'str[]' , and put 'i' inside the brackets.
I could not able to do that. It might be a bug of this forum.

Great, it worked!!! I added [] in the FirstClass program, but forgot to add it on this one. Thanks very much. Can we do one more thing? This will be a good excersise for other beginners as well. Here it is.

Now change this program to accept the switch '-o<ClassName>' on command line. The -o will accept the name of a Java class creates an instance of that class if it has no-args constructor. The program converts the object to a String object and displays the result of conversion to users. (if -f switch specified the result is written to a file)

How's this question? Also, what would you recommand as a good book to read about string and string buffer? I looked in Baldwin's tutorial, but it doesn't say much. You have a great weekend, Pooch. Thanks again.

[poochi]

Sure we can.. But you have to wait till the evening.. I got someother work to do now.
i will post the source code in the evening.

:-) pooch ? That's a nick name... "Poochi" = "insect" in English. :-)
Have a great weekend ..

really? I thought 'Pooch'='Dog'. :) I know Pooch is your nickname, thanks to you I have a better understanding of file i/o now. Thanks. blue

Hi, pooch! Any word of advise on this problem? Thanks.
Blue

[poochi]

> accept the switch '-o<ClassName>' on command line. The -o will accept
> the name of a Java class creates an instance of that class if it has no-args constructor. The
> program converts the object to a String object and displays the result of conversion to users.
> (if -f switch specified the result is written to a file)

This is a very simple one ... Get the class name from the user as you get the file name ..
Then do like this ..



String className = <get The className from the Commandline argument>
Object obj = Class.forName( className ).newInstance();
System.out.println( obj.toString());


// Here is that class

class TestClass{
String strSomeValue;
public TestClass(){
strSomeValue = "junk";
}
public String toString(){
return strSomeValue;
}
}