eclipse argument

Please verify if you are running the very same configuration once you have set the parameter.

Check this basic tutorial, I think your program is fine, just that you are not running the configuration which you added param to.

http://theopentutorials.com/tutorials/java/cmd-line-args/how-to-pass-command-line-arguments-in-eclipse-ide/

awking00

Can you post the main method of your program?

ASKER

i will provide this soon

https://www.mkyong.com/java/how-to-write-to-file-in-java-bufferedwriter-example/

ASKER

package com.mkyong;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class WriteToFileExample1 {

	private static final String FILENAME = "E:\\test\\filename.txt";

	public static void main(String[] args) {

		BufferedWriter bw = null;
		FileWriter fw = null;

		try {

			String content = "This is the content to write into file\n";

			fw = new FileWriter(FILENAME);
			bw = new BufferedWriter(fw);
			bw.write(content);

			System.out.println("Done");

		} catch (IOException e) {

			e.printStackTrace();

		} finally {

			try {

				if (bw != null)
					bw.close();

				if (fw != null)
					fw.close();

			} catch (IOException ex) {

				ex.printStackTrace();

			}

		}

	}

}

how to pass below as command line argument in eclipse?

E:\\test\\filename.txt

?
please advise

Hi,

You need to change your code to first accept a command line argument and then need to ensure value passed from command line is not null. Later you can pass the variable as suggested above.

fw = new FileWriter(FILENAME);

Should become

fw = new FileWriter(args[0]);

Even better validate args[0] is not null. Thanks

ASKER

as attached i passed program argument

package com.mkyong;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class WriteToFileExample1 {

	private static final String FILENAME = "E:\\test\\filename.txt";

	public static void main(String[] args) {

		BufferedWriter bw = null;
		FileWriter fw = null;

		try {

			String content = "This is the content to write into file\n";

			fw = new FileWriter(FILENAME);
			bw = new BufferedWriter(fw);
			bw.write(content);

			System.out.println("Done");

		} catch (IOException e) {

			e.printStackTrace();

		} finally {

			try {

				if (bw != null)
					bw.close();

				if (fw != null)
					fw.close();

			} catch (IOException ex) {

				ex.printStackTrace();

			}

		}

	}

}

still did not create. please advise

Because you didn't change line 20 in the above code as I suggested above.

fw = new FileWriter(FILENAME);

change this to

fw = new FileWriter(args[0]);

and then pass the parameter.

ASKER

package com.gp.maven.calculator.calculator;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class WriteToFileExample1 {

	//private static final String FILENAME = "C:\\test\\filename.txt";

	public static void main(String[] args) {

		BufferedWriter bw = null;
		FileWriter fw = null;

		try {

			String content = "This is the content to write into000 file\n";

			//fw = new FileWriter(FILENAME);
			fw = new FileWriter(args[0]);
			bw = new BufferedWriter(fw);
			bw.write(content);

			System.out.println("Done");

		} catch (IOException e) {

			e.printStackTrace();

		} finally {

			try {

				if (bw != null)
					bw.close();

				if (fw != null)
					fw.close();

			} catch (IOException ex) {

				ex.printStackTrace();

			}

		}

	}

}

i changed even then same issue?

ASKER

under
C:\test

i do not see file888.txt
i passed the argument as well as attached
arg.png

ASKER CERTIFIED SOLUTION

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ASKER

ASKER

from command prompt we never have to give complete path though

That is because the value of File name was hardcoded here:

private static final String FILENAME = "C:\\test\\filename.txt";