错误java.lang.ArrayIndexOutOfBoundsException：2

Question

我正面临java.lang.ArrayIndexOutOfBoundsException...。但是我的String包含两个以上的值

  String[] elements = { "Allama Iqbal","born","in","Sailkot"};

 String str = String.join(",", elements); 

           String str = String.join(",", elements);
String[] strArray = new String[] {str};
          if(strArray[2].equals("NNP") ) {
}

The POS are...Allama//NNP
The POS are...Iqbal//NNP
The POS are...,//,
The POS are...born//VBN
The POS are...,//,
The POS are...in//IN
The POS are...,//,
The POS are...Sailkot//NNP
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2

Answer 1

此

String str = String.join(",", elements);

返回一个字符串。因此，

String[] strArray = new String[] {str};

只有1个元素