Thread: read and modify a text file

Good evening \ morning ppl

i have homework that requires

"Write a Java program to perform the following:

Read 5 floating point number and 5 integers from Keyboard.

Write them to a file with name “dataFile1.txt”

Read and display them.

Read and multiply by 2 and write them back to the another file “dataFile2.txt”.

Read the file “dataFile2.txt” and display the values"

I did the first part but I have difficulties in doning the second part which is "Read and multiply by 2 and write them back to the another file “dataFile2.txt”."

Can any one help me

What are you having problems with?
Please explain.

You should probably use a Scanner, or something to read the file.

It has a nextInt() function already in it.

However, you should probably keep track of which type is a int and which is a float and where they are. For instance, you could do something like this

Scanner s;
try
{
s = new Scanner(new File("dataFile2.txt"));
}

catch(java.io.FileNotFoundException fnfe)
{
System.out.println("File not found.");
System.exit(1);
}

Did you try that already?

Also, you could try this

int x;
float y;

x = s.nextInt();
y = s.nextFloat();