Android Studio: Custom Writer Class extends BufferedWriter (PemWriter)

Question

The following is an example of the class that I have to use. I've generalized the names to get at the concept rather than the my particular use. I'm trying to figure out how to use it. So, I can't change this part, only what's in my activity:

public class MyWriter extends BufferedWriter {

public MyWriter(Writer out)
{
    super(out);
}

public void writeTest(String repeatthis) throws IOException {
    this.write(repeatthis);
    this.newLine();
    this.write("along with this other stuff.");
}
}

This is what's in my activity:

    String iwantThisString = "";
    StringWriter writer = new StringWriter();
    MyWriter myWriter = new MyWriter(writer);
    String myNewString = "I want to see this repeated back to me.";

    try {
        myWriter.writeTest(myNewString);
        iwantThisString = writer.toString();  //Does not work.
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        writer.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

How do I get iwantThisString, to pick up what writeTest is laying down?

If you want to see the actual class that I'm trying to use, it's the pemWriter from Spongy Castle.

I'm afraid you've neglected to ask a specific question. – President James K. Polk Nov 18 '18 at 22:13 — President James K. Polk, Nov 18 '18 at 22:13
I've added my specific questions. Thanks – Adam Winter Nov 18 '18 at 22:49 — Adam Winter, Nov 18 '18 at 22:49

Adam Winter · Answer 1 · 2018-11-21T18:51:46.237

Also, I've found that the following code does work with the spongy castle library, taken from: Export RSA public key to PEM String using java

    PublicKey publicKey = keyPair.getPublic();
    StringWriter writer = new StringWriter();
    PemWriter pemWriter = new PemWriter(writer);
    pemWriter.writeObject(new PemObject("PUBLIC KEY", publicKey.getEncoded()));
    pemWriter.flush();
    pemWriter.close();
    return writer.toString();

Adam Winter · Answer 2 · 2020-01-27T17:59:11.750

Forgot to flush the buffered writer as MyWriter extends BufferedWriter.

    StringWriter writer = new StringWriter();
    MyWriter myWriter = new MyWriter(writer);
    String myNewString = "I want to see this repeated back to me.";

    try {
        myWriter.writeTest(myNewString);
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        myWriter.flush();
        myWriter.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return writer.toString();

Android Studio: Custom Writer Class extends BufferedWriter (PemWriter)

2 Answers2