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| |
| <h1>Java interpreter for Apache Zeppelin</h1> |
| |
| <div id="toc"></div> |
| |
| <h2>How to use</h2> |
| |
| <p>Basically, you can write normal java code. You should write the main method inside a class because the interpreter invoke this main to execute the code. Unlike Zeppelin normal pattern, each paragraph is considered as a separate job, there isn't any relation to any other paragraph. For example, a variable defined in one paragraph cannot be used in another one as each paragraph is a self contained java main class that is executed and the output returned to Zeppelin.</p> |
| |
| <p>The following is a demonstration of a word count example with data represented as a java Map and displayed leveraging Zeppelin's built in visualization using the utility method <code>JavaInterpreterUtils.displayTableFromSimpleMap</code>.</p> |
| <div class="highlight"><pre><code class="java language-java" data-lang="java"><span class="o">%</span><span class="n">java</span> |
| <span class="kn">import</span> <span class="nn">java.util.HashMap</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">java.util.Map</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.zeppelin.java.JavaInterpreterUtils</span><span class="o">;</span> |
| |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">HelloWorld</span> <span class="o">{</span> |
| |
| <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span> |
| |
| <span class="n">Map</span><span class="o"><</span><span class="n">String</span><span class="o">,</span> <span class="n">Long</span><span class="o">></span> <span class="n">counts</span> <span class="o">=</span> <span class="k">new</span> <span class="n">HashMap</span><span class="o"><>();</span> |
| <span class="n">counts</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="s">"hello"</span><span class="o">,</span><span class="mi">4L</span><span class="o">);</span> |
| <span class="n">counts</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="s">"world"</span><span class="o">,</span><span class="mi">5L</span><span class="o">);</span> |
| |
| <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">JavaInterpreterUtils</span><span class="o">.</span><span class="na">displayTableFromSimpleMap</span><span class="o">(</span><span class="s">"Word"</span><span class="o">,</span><span class="s">"Count"</span><span class="o">,</span> <span class="n">counts</span><span class="o">));</span> |
| |
| <span class="o">}</span> |
| |
| <span class="o">}</span> |
| </code></pre></div> |
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