Given below the sample code :

public class Check{
public static void main(String args[]){
ArrayList alist = new ArrayList();
ArrayList<String> listStr = alist;
ArrayList<StringBuffer> listBuf = alist;
listStr.add(0, "Welcome");
StringBuffer buff = listBuf.get(0);
System.out.println(buff.toString());
}
}

What will be the output of the following?

1. Welcome
2. Compile error
3. java.lang.ClassCastException
4. null

Answer

(3)

Explanation

'java.lang.String' cannot be cast to 'java.lang.StringBuffer'

Related Tags for SCJP Module-9 Question-9: