Text files on the roborio?

[2B || !2B]

Hi,

Does anyone know how to write text files to storage on the roborio with java?

If so, what directories do I have access to?

Here's my code if it helps:

package org.usfirst.frc.team1559.robot;

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

import edu.wpi.first.wpilibj.IterativeRobot;

public class Robot extends IterativeRobot {
    /**
     * This function is run when the robot is first started up and should be
     * used for any initialization code.
     */
	
	File f;
	BufferedWriter bw;
	FileWriter fw;
	
    public void robotInit() {
    	try {
    		f = new File("~/Output.txt");
    		if(!f.exists()){
    			f.createNewFile();
    		}
			fw = new FileWriter(f);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    	bw = new BufferedWriter(fw);
    }


    public void teleopInit(){
    	
    	try {
			bw.write("Hellow, I'm a text file");
			bw.close();
			fw.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    	
    }
}

With this code I get the following error:
java.io.IOException: No such file or directory
at java.io.UnixFileSystem.createFileExclusively(Nativ e Method)
at java.io.File.createNewFile(File.java:1012)
at org.usfirst.frc.team1559.robot.Robot.robotInit(Rob ot.java:32)
at edu.wpi.first.wpilibj.IterativeRobot.startCompetit ion(IterativeRobot.java:76)
at edu.wpi.first.wpilibj.RobotBase.main(RobotBase.jav a:234)
ERROR Unhandled exception: java.lang.NullPointerException at [java.io.Writer.<init>(Writer.java:88), java.io.BufferedWriter.<init>(BufferedWriter.java: 101), java.io.BufferedWriter.<init>(BufferedWriter.java: 88), org.usfirst.frc.team1559.robot.Robot.robotInit(Rob ot.java:39), edu.wpi.first.wpilibj.IterativeRobot.startCompetit ion(IterativeRobot.java:76), edu.wpi.first.wpilibj.RobotBase.main(RobotBase.jav a:234)]
WARNING: Robots don't quit!
---> The startCompetition() method (or methods called by it) should have handled the exception above.

Any help is appreciated!