LaTeX - justifying paragraphs

\documentclass{article}

\begin{document}
\title{Justifying paragraphs\\in \LaTeX}
\date{}
\maketitle

This paragraph is justified.
This paragraph is justified.
This paragraph is justified.
This paragraph is justified.
This paragraph is justified.
This paragraph is justified.
This paragraph is justified.
This paragraph is justified.

\begin{flushleft}
  This paragraph is set flush left.
  This paragraph is set flush left.
  This paragraph is set flush left.
  This paragraph is set flush left.
  This paragraph is set flush left.
  This paragraph is set flush left.
  This paragraph is set flush left.
  This paragraph is set flush left.
  This paragraph is set flush left.
\end{flushleft}

\begin{flushright}
  This paragraph is set flush right.
  This paragraph is set flush right.
  This paragraph is set flush right.
  This paragraph is set flush right.
  This paragraph is set flush right.
  This paragraph is set flush right.
  This paragraph is set flush right.
  This paragraph is set flush right.
\end{flushright}

\begin{center}
  This paragraph is set centered.
  This paragraph is set centered.
  This paragraph is set centered.
  This paragraph is set centered.
  This paragraph is set centered.
  This paragraph is set centered.
  This paragraph is set centered.
  This paragraph is set centered.
\end{center}

\end{document}