MORE HELP ON TEXT FILES - URGENT

Question

I'm Writing a Business Professionals Of America Database for the High School I attend and I need to know about some input and output to text files
Suppose I have a String called 'line1'
I also have a textfile called 'C:/......../info.txt'
In that text file I have the line '34865-M-J-101'
Can someone show me how to take that line out of the text file and place it into 'line1'???
The second thing I need to know is.............
I have a TextField in my java program, once the user enters something into the textfield and clicks a button I made, I need to take that information and output it to a text file. I know how to take the information OUT of the textfield and into a variable, I just need the code on how to output the variable's information to a textfile.

Answer 1

I'm Writing a Business Professionals Of America
Database for the High School I attend and I need to
know about some input and output to text filesHow much information do you have. If there is a lot of information I would recommend using an actual database instead of a text file.
Suppose I have a String called 'line1'
I also have a textfile called 'C:/......../info.txt'
In that text file I have the line '34865-M-J-101'
Can someone show me how to take that line out of the
text file and place it into 'line1'???That looks like some kind of ID. What you could do (also I'm assuming you don't have a tremendous amount of data, otherwise use an actual database) is use the java.util.Properties class and setup your data as lines with "34865-M-J-101=some entry for that". Then you could use code like:
Properties props=new Properties();
props.load(new FileInputStream("C:/....../info.txt"));
String line=props.getProperty("34865-M-J-101");The line would then have "some entry for that".
The second thing I need to know is.............
I have a TextField in my java program, once the user
enters something into the textfield and clicks a
button I made, I need to take that information and
output it to a text file. I know how to take the
information OUT of the textfield and into a variable,
I just need the code on how to output the variable's
information to a textfile.Assuming you took the approach above something like:
props.store(new FileOutputStream("C:/....../info.txt", null));The best way to do this really depends on how much information there is and what you need to do with it. For example, if you do not have some unique key for each entry, you probably don't want to use properties.