" ".split(" ") generates a NullPointerException : 字符串分割 « 数据类型 « Java

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Java » 数据类型 » 字符串分割屏幕截图 
" ".split(" ") generates a NullPointerException
 

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

    String[] words = " ".split(" ");
    String firstWord = words[0];
    System.out.println(firstWord);
  }
}
/*

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
  at Main.main(Main.java:5)
*/

   
  
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