import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class MainClass {
public static void main(String args[]) throws Exception {
List list = new ArrayList();
list.add("A");
list.add("B");
list.add("C");
list = Collections.unmodifiableList(list);
list.add(1, "G");
System.out.println(list);
}
}
Exception in thread "main" java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableList.add(Collections.java:1160)
at MainClass.main(MainClass.java:14)