try {
// Execute command
String command = "ls";
Process child = Runtime.getRuntime().exec(command);

// Get input stream to read from it
InputStream in = child.getInputStream();
int c;
while ((c = in.read()) != -1) {
process((char)c);
}
in.close();
} catch  (IOException e) {
}


sending input

try {
// Execute command
String command = "cat";
Process child = Runtime.getRuntime().exec(command);

// Get output stream to write from it
OutputStream out = child.getOutputStream();

out.write("some text".getBytes());
out.close();
} catch (IOException e) {
}