Use EMPTY_STRING_ARRAY constant. (apache#102)

Author: arturobernalg

src/main/java/org/apache/commons/cli/CommandLine.java

@@ -25,6 +25,8 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 import java.util.List;
 import java.util.Properties;
 
+import static org.apache.commons.cli.Util.EMPTY_STRING_ARRAY;
+
 /**
  * Represents list of arguments parsed against a {@link Options} descriptor.
  * <p>
@@ -328,7 +330,7 @@ public String[] getOptionValues(final Option option) {
             }
         }
 
-        return values.isEmpty() ? null : values.toArray(new String[values.size()]);
+        return values.isEmpty() ? null : values.toArray(EMPTY_STRING_ARRAY);
     }
 
     /**

src/main/java/org/apache/commons/cli/Option.java

@@ -22,6 +22,8 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 import java.util.List;
 import java.util.Objects;
 
+import static org.apache.commons.cli.Util.EMPTY_STRING_ARRAY;
+
 /**
  * Describes a single command-line option. It maintains information regarding the short-name of the option, the
  * long-name, if any exists, a flag indicating if an argument is required for this option, and a self-documenting
@@ -617,7 +619,7 @@ public String getValue(final String defaultValue) {
      * @return the values of this Option as a String array or null if there are no values
      */
     public String[] getValues() {
-        return hasNoValues() ? null : values.toArray(new String[values.size()]);
+        return hasNoValues() ? null : values.toArray(EMPTY_STRING_ARRAY);
     }
 
     /**