title: how to compare 2 java string array and remove if have same value
body: <p>i'm having 2 string array,</p>
  
  <pre><code>  str1[] = {"a","b","aa","c"} 
  </code></pre>
  
  <p>and</p>
  
  <pre><code>  str2[] = {"aa","a","b","c","d"}
  </code></pre>
  
  <p>how can i compare and remove value if exist in both string[], expected result, str3[]= {"d"}</p>
  
  <p>thanks in advance</p>