program flow

I am starting off with a small project in which the output from one java program should be the input to another java program and it continues.

First, I am only dealing with text data; later on, I have to develop it into GUI application.

In the java desktop application I have to work with frames.

For the time being, I only need to know how to store the string output from an java application. And then, I can access that string from the second application and so forth.
Thanks,

Code:

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File file_variable = new File("filename.dat");//
FileWriter file_writer = new File(file_variable);
String string_from_program = new String(program_result);//
file_writer.writeString(string_from_program);
file_writer.flush();file_writer.close();

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The code is written to state the procedure of doing what you ask, it is not exactly the way easiest done, and is probably technically incorrect.