Java length method error
<p>I'm developing a dictation program in which I try to compare text entered by a student to the correct text but I have errors on compiling which doesn't make sense to me.</p>

<p><strong>CODE:</strong></p>

<pre><code>String[] list_answer = exercise_english_1.answer.split("\\s+");
String[] list_responce = exercise_english_1.response.split("\\s+");
ArrayList&lt;String&gt; list_error = new ArrayList&lt;String&gt;();

for(int i = 0; i &lt; list_answer.length(); ++i) {
    if (list_responce[i].equals(list_answer[i]))
        exercise_english_1_statistics.score += (double) 1 / list_answer.length();
    else
        list_error.add(list_responce[i]);
}
</code></pre>

<p><strong>ERRORS:</strong> </p>

<pre><code>C:\Users\?????\OneDrive\Java\Project\Prototype\Prototype.java:71: error: cannot find symbol
                        for(int i = 0; i &lt; list_answer.length(); ++i) {
                                                      ^
  symbol:   method length()
  location: variable list_answer of type String[]
C:\Users\?????\OneDrive\Java\Project\Prototype\Prototype.java:73: error: cannot find symbol
                                        exercise_english_1_statistics.score += (double) 1 / list_answer.length();

  symbol:   method length()
  location: variable list_answer of type String[]
C:\Users\?????\OneDrive\Java\Project\Prototype\Prototype.java:208: error: cannot find symbol
                        for(int i = 0; i &lt; list_answer.length(); ++i) {
                                                      ^
  symbol:   method length()
  location: variable list_answer of type String[]
C:\Users\?????\OneDrive\Java\Project\Prototype\Prototype.java:210: error: cannot find symbol
                                        exercise_french_1_statistics.score += (double) 1 / list_answer.length();
                                                                                                      ^
  symbol:   method length()
  location: variable list_answer of type String[]
4 errors
</code></pre>

<p>PS: Sorry for my bad English, it's not my native language...</p>