List进行remove和add操作时缘何会报UnsupportedOperationException

看段简单的代码：

String[] arry={"abc","eee","fff"};
List<String> list= Arrays.asList(arry);
list.add("eeef");

运行结果：

Exception in thread "main" java.lang.UnsupportedOperationException
	at java.util.AbstractList.add(Unknown Source)
	at java.util.AbstractList.add(Unknown Source)
	at com.jd.etms.vrs.ws.test.TestList.main(TestList.java:17)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

原因是：使用Arrays.asList转换过来的集合是固定长度的，不能进行remove和add

解决办法：

 List<String> list= new ArrayList<String>(Arrays.asList(arry));