Why doesn't my TabbedPrintWriter work?

Question

I am writing a java decompiler. To give the output a nice indent, I have decided to write a class called TabbedPrintWriter to automatically tabify the output appropriately. Here's the code:

import java.io.OutputStream;
import java.io.PrintWriter;

public class TabbedPrintWriter extends PrintWriter {
    private static int indentAmount = 4;
    private int indent = 0;
    public TabbedPrintWriter(OutputStream out) {
        super(out);
    }

    public TabbedPrintWriter(OutputStream out, boolean autoFlush) {
        super(out, autoFlush);
    }

    @Override
    public void println() {
        super.println();
        for (int i = 0; i <= indentAmount * indent; i++) {
            super.write(' ');
        }
    }

    public void indent() {
        indent++;
    }

    public void unindent() {
        indent--;
    }

}

I also wrote a test class to test this:

public class TabbedPrintWriterTest {

    public static void main(String[] args) {
        TabbedPrintWriter writer = new TabbedPrintWriter(System.out, true);
        writer.println("Hello");
        writer.indent();
        writer.println("Goodbye");
    }

}

If you look at the code, each indent level should be four spaces. However, if I run this, I get this output:

Hello
 Goodbye

Yes, that's right. Only one space.

Why is this?

Answer 1

After a rewrite of code and some debugging, I finally managed to get this to work:

public class TabbedPrintWriter extends PrintWriter {

    private static int indentAmount = 4;
    private int indent = 0;
    private StringBuilder line = new StringBuilder();

    public TabbedPrintWriter(OutputStream out) {
        super(out);
    }

    public TabbedPrintWriter(OutputStream out, boolean autoFlush) {
        super(out, autoFlush);
    }

    @Override
    public void println() {
        for (int i = 0; i < indentAmount * indent; i++)
            line.insert(0, ' ');
        super.write(line.toString(), 0, line.length());
        line = new StringBuilder();
        super.println();
    }

    @Override
    public void write(int c) {
        line.append((char) c);
    }

    @Override
    public void write(String s, int off, int len) {
        line.append(s, off, len);
    }

    @Override
    public void write(char[] buf, int off, int len) {
        line.append(buf, off, len);
    }

    public void indent() {
        indent++;
    }

    public void unindent() {
        indent--;
    }
}

Basically, I do line buffering and insert indentation prior to printing out the line. Now that it is working, I will not be needing the help of the community, so the primary reason is to make sure nobody gets distracted trying to answer a question that doesn't need answering. And to spread the word of a working tabbed print writer.