java.lang.UnsupportedOperationException

Exceptions, Java By Anand Yerrapati Jul 12, 2013 1 Comment

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);
}