Test java programs that read from stdin and write to stdout
Try the following:
String string = "aaa";
InputStream stringStream = new java.io.ByteArrayInputStream(string.getBytes())
stringStream
is a stream that will read chars from the input string.
OutputStream outputStream = new java.io.ByteArrayOutputStream();
PrintStream printStream = new PrintStream(outputStream);
// .. writes to printWriter and flush() at the end.
String result = outputStream.toString()
printStream
is a PrintStream
that will write to the outputStream
which in turn will be able to return a string.