java.lang.UnsupportedOperationException at java.util.AbstractList.remove(Unknown Source)

Question

I have tried below code

String s[]={\"1\",\"2\",\"3\",\"4\"};  
Collection c=Arrays.asList(s);  
System.out.println(c.remove(\"1\") +\"  remove flag\");  

Syste         


        

Answer 1

The List returned by Arrays.asList method of java.util.Arrays class is a fixed-size list object which means that elements cannot be added to or removed from the list.

So functions like Adding or Removing cannot be operated on such kind of Lists.

The solution to adding or removing without getting java.lang.UnsupportedOperationException is ->

List strList= new ArrayList<>(Arrays.asList(strs));

//Then Add or Remove can be called on such List

newList.add("100");
newList.remove("100");