Thread: Create a file specifying the size JAVA

Hello and welcome to the forums.

Here is a crude example for you. It should give you an idea about what you need to do..

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
 
public class FileProg {
 
	/**
	 * JavaProgrammingForums.com
	 */
 
	//100000000 bytes = 10mb
	public static int setSize = 100000000;
 
	public static void main(String[] args) throws IOException {
 
        FileProg fp = new FileProg();
        String newline = System.getProperty("line.separator");
 
        // Create file
		Writer output = null;
		File file = new File("file.txt");
		output = new BufferedWriter(new FileWriter(file, true));
		output.write("");
		output.write(newline);
 
		// Get file size in bytes
        long size = fp.getFileSize("file.txt");
 
        // Write file whilst the size is smaller than setSize
		while(size < setSize){
		output.write("Java Programming Forums");
		output.write(newline);
 
		size = fp.getFileSize("file.txt");
		System.out.println(size + " bytes");
		}
 
		output.close();
		System.out.println("Finished at - " + size);
 
	}
 
	// File size code
    public long getFileSize(String filename) {
        File file = new File(filename);        
        	if (!file.exists() || !file.isFile()) {
        		System.out.println("File does not exist");
        		return -1;
        	}
        return file.length();
      }
}

Originally Posted by JavaPF

Hello and welcome to the forums.

Here is a crude example for you. It should give you an idea about what you need to do..

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
 
public class FileProg {
 
	/**
	 * JavaProgrammingForums.com
	 */
 
	//10000000 bytes = 10mb
	public static int setSize = 10000000;
 
	public static void main(String[] args) throws IOException {
 
        FileProg fp = new FileProg();
        String newline = System.getProperty("line.separator");
 
        // Create file
		Writer output = null;
		File file = new File("file.txt");
		output = new BufferedWriter(new FileWriter(file, true));
		output.write("");
		output.write(newline);
 
		// Get file size in bytes
        long size = fp.getFileSize("file.txt");
 
        // Write file whilst the size is smaller than setSize
		while(size < setSize){
		output.write("Java Programming Forums");
		output.write(newline);
 
                //flush for the file to get updated on size and content
                output.flush();
 
		size = fp.getFileSize("file.txt");
		System.out.println(size + " bytes");
		}
 
		output.close();
		System.out.println("Finished at - " + size);
 
	}
 
	// File size code
    public long getFileSize(String filename) {
        File file = new File(filename);        
        	if (!file.exists() || !file.isFile()) {
        		System.out.println("File does not exist");
        		return -1;
        	}
        return file.length();
      }
}

i fear you forgot to flush the string so it will write and size will get updated, but other then that - thank you very much, added the missing flush.
helped alot

--==edit==--
lol, well that extra 0 on the mb number caught me by surprise
careful, thats 100mb and not 10mb
i fixed the digits on my quote of your code.