[Cannix75]

This is what i'm trying to do:
Generate a file with a random number of circle objects
each with a random radius.
Read from the file and compute average area.
Using exception handling, no detection of end of file.

but i keep getting an error on

 		output.write(radius[curCircle]);

the error is
java:18: cannot resolve symbol
symbol : method write (double)
location: class java.io.FileOutputStream
output.write(radius[curCircle]);
^
1 error

import java.io.*;
public class TestRandomCircle{

	public static void main(String[] args) throws IOException{

	FileOutputStream output = new FileOutputStream("temp.dat");


		double radius[] = new double[20];

		for(int curCircle = 0; curCircle < 20; curCircle++){

		radius[curCircle] = Math.random();


		output.write(radius[curCircle]);

		output.close();
		}





	}
}

[William_Wilson]

that's because it only accepts ints or char[] as output.
If you want to use a FileOutputStream you will need to convert it to a String then use .toCharArray() and then write the result.

or create a Double object instead of the double primative and use you can use my example under: Output an object

[Cannix75]

William_Wilson, on 29 Nov, 2006 - 10:35 AM, said:

that's because it only accepts ints or char[] as output.
If you want to use a FileOutputStream you will need to convert it to a String then use .toCharArray() and then write the result.

or create a Double object instead of the double primative and use you can use my example under: Output an object

ya i changed it to objectoutputstream because i am reading the circle objects from my circle class. Thx for the help tho

[Cannix75]

Ok now i have run into a problem with creating my random circle objects.

import java.io.*;
public class TestRandomCircle{

	public static void main(String[] args) throws IOException{

	ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream("object.dat"));


		double radius[] = new double[20];

		for(int curCircle = 0; curCircle < 20; curCircle++)
		{
			radius[curCircle] = Math.random()*10;

			output.writeDouble(radius[curCircle]);
		}


		Circle cCircles[] = new Circle[20];
		double totalRad = 0;
		for(int testCirlce = 0; testCircle < 20; testCircle++)
		{
			cCircles[testCircle] = new Circle(radius);
			totalRad+= radius;
			output.writeDouble(cCircles[testCircle]);
		}

		double avgRad = totalRad / 20;


		//ObjectInputStream input = new ObjectInputStream(new FileInputStream("object.dat"));

		//double [] newRadius = (double [])(input.readObject());


	}
}

i get a syntex error that it does not reconize circle this is my circle class

public class Circle
{
	public double radius = 0.0;
	public Circle()
	{

	}

	public Circle(double in_Rad)
	{
		radius = in_Rad;
	}


	public void setRad(double in_Rad)
	{
		radius = in_Rad;
	}

	public double getRad()
	{
		return radius;
	}


}

also i do not know how to get input fromt he file once i write to it.

[salindor]

I know dumb question, but you got to ask it at least once.

are the two source files in the same folder and is the class path set to include the current directory?

If not, you need to set the class path to each directory (assuming you don't want to deal with packaging).