How to open a command prompt and input different commands from a java program

Question

I need to open a command prompt & execute ij.bat, which will take me to another prompt, where I can give command to connect to DB & later different sql stat

Answer 1

You can use this exec public Process exec(String command) throws IOException

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Answer 2

Instead of trying to run ij.bat, and feed it commands to run and parse the output, just have your program use the ij class, and its runScript method: http://db.apache.org/derby/docs/10.11/publishedapi/org/apache/derby/tools/ij.html#runScript-java.sql.Connection-java.io.InputStream-java.lang.String-java.io.OutputStream-java.lang.String-

Then you don't have to spawn a separate process, but can just keep everything in pure Java in your program itself.