Java Code:
import org.eclipse.jface.resource.FontRegistry;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class FontRegistryExample {
  Display display = new Display();
  Shell shell = new Shell(display);
  FontRegistry fontRegistry;

  public FontRegistryExample() {
    init();

    shell.pack();
    shell.open();
    //textUser.forceFocus();

    // Set up the event loop.
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        // If no more entries in event queue
        display.sleep();
      }
    }

    display.dispose();
  }

  private void init() {
    shell.setLayout(new GridLayout(2, false));
    fontRegistry = new FontRegistry(display);
    fontRegistry.put("button-text", new FontData[]{new FontData("Arial", 9, SWT.BOLD)} );
    fontRegistry.put("code", new FontData[]{new FontData("Courier New", 10, SWT.NORMAL)});
    Text text = new Text(shell, SWT.MULTI | SWT.BORDER | SWT.WRAP);
    text.setFont(fontRegistry.get("code"));
    text.setForeground(display.getSystemColor(SWT.COLOR_BLUE));
    text.setText("public static void main() {\n\tSystem.out.println(\"Hello\"); \n}");
    GridData gd = new GridData(GridData.FILL_BOTH);
    gd.horizontalSpan = 2;
    text.setLayoutData(gd);
    Button executeButton = new Button(shell, SWT.PUSH);
    executeButton.setText("Execute");
    executeButton.setFont(fontRegistry.get("button-text"));
    Button cancelButton = new Button(shell, SWT.PUSH);
    cancelButton.setText("Cancel");
    cancelButton.setFont(fontRegistry.get("button-text"));
  }

  public static void main(String[] args) {
    new FontRegistryExample();
  }
}