Sorry it got error:

import java.io.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

public class upperCase {

    public static void main(String[]args)
    {
    	Scanner in = null;
    	PrintWriter out = null;
    	try
    	{
    		File file = new File("Chapter9.txt");
    		in = new Scanner(file);
    		out = new PrintWriter("output.txt");
    	}		
    	catch (FileNotFoundException ex)
    	{
    		System.out.println(ex.getMessage());
    		System.out.println("in" + System.getProperty("user.dir"));
    		System.exit(1);
    	}
    	
    	while(in.hasNextLine())
    	{
    		String record = in.nextLine();
    		if (record.indexOf("bwbecker") >= 0)
    		{
    			String upper = record.toUpperCase();
    			System.out.println(upper);
				System.out.println("output.txt");
    		}
    	}
    	
    	
    	
    	//Close the file
    	in.close();
    	out.close();
    }
    
    
}

Can anyone help me??
Thank You!

“it doesn’t want to print out”

Try to convince it

Are you getting errors ? what happens when you run the code ?

Please provide more details.

There is no error at all. It just not printing anything. I tried to output it on the file with content but it turn into blank. All the content inside that file disappeared.

I still can’t print out the output even though I tried to change from “

System.out.println(upper);

” to “

out.println(upper);

“. Did anyone have any other solution???

The problem could be that you are not reading the input file correctly, and this condition is never met:

while(in.hasNextLine())

I would recommend testing the reading and writing to files separately. Make sure you know how to write to files first, and when you have a working example of writing to files using a PrintWriter then create another program to test the reading of files and the use of the Scanner class.

Here’s a small code you could use to test the PrintWriter class:

import java.io.FileWriter;
import java.io.PrintWriter;

public class printwriter {
  public static void main(String[] args) throws Exception {
    String[] linesToWrite = new String[] { "a", "b" };

    PrintWriter out = null;
    out = new PrintWriter("some_new_file.txt");
    for (int i = 0; i < linesToWrite.length; i++) {
      out.println(linesToWrite[i]);
    }
    out.flush();
    out.close();
  }
}