When comparing Object arrays, null elements are equal. If the elements are not null, Object.equals() is used.

 

import java.util.Arrays;

public class Main {
  public static void main(String[] argv) throws Exception {

    boolean b = Arrays.equals(new String[] { "a" }, new String[] { "a" });
    b = Arrays.equals(new String[] { null }, new String[] { null }); 
    b = Arrays.equals(new String[] { "a" }, new String[] { null }); 
  }
}

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When comparing Object arrays, null elements are equal. If the elements are not null, Object.equals() is used. : Arrays « Collections Data Structure « Java

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