java.lang.UnsupportedOperationException

As the name implies when the requested operation is not supported, we get this error.

Below is a sample program to generate this error.

public static void main(String args[]) { String st[]={"Hi","Hello","Bye"}; List list=Arrays.asList(st); list.add(“Anand”); //Get error at this line System.out.println(" List: "+list); }

 If we run this method, we get the below error because we are trying to add a new element to a list which is not updatable.

Caused by: java.lang.UnsupportedOperationException

                at java.util. List.add(List.java:131)

                at java.util. List.add(List.java:91)

                at Test.main(Test.java:7)

 I modified the program as below to run without errors.

public static void main(String args[]) { String st[]={"Hi","Hello","Bye"}; ArrayList<String> list = new ArrayList<String>(); //List list=Arrays.asList(st); list.addAll(Arrays.asList(st)); list.add(“Anand”); //Get error at this line System.out.println(" List: "+list); }