title: Meaning of the bold blue font in Eclipse
body: <p>I am new to programming and Java. I am trying to learn it by doing. I am studying the open source library where I found 1 unit test. I created a "sandbox", where I copied this unit test and I try to put all the code into the main method.</p>
  
  <p>I have the following question: why does the double and int type of variables have <strong>blue bold font</strong> in the unit test and they are brown in my sandbox. Does that mean that these variables changed somehow? If yes, how did they change ( Should I worry about different behavior of the code than in Unit tests?)
  For example, </p>
  
  <p>The original screenshot of the test file:</p>
  
  <p><a href="https://i.stack.imgur.com/sAELN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sAELN.png" alt="original"></a></p>
  
  <p>Screenshot of my file:</p>
  
  <p><a href="https://i.stack.imgur.com/dH3qT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dH3qT.png" alt="my_file"></a></p>
  
  <p>and see how I played with Eclipse IDE suggestion to remove the warnings: </p>
  
  <p><a href="https://i.stack.imgur.com/56QTz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/56QTz.png" alt="Eclipse suggestion"></a></p>
  
  <p>It is written that Name <code>'TOLERANCE_ROOT' and 'STEP_MAX' must match pattern '^[a-z][a-zA-Z0-9]*$'</code>. I believe that it is problem with conventions that my types of the variables in main method are different from the same types of variables in the test class.</p>