Description Tobias Riemenschneider 2005-06-27 04:30:02 EDT

When trying to compile the following piece of code
####
import java.util.ArrayList;

class Class<A> {
  ArrayList<A> list = new ArrayList<A>();
  ArrayList<? super A> superList = new ArrayList<A>();
  ArrayList<? extends A> extendsList = new ArrayList<A>();

  ArrayList<A> getList() {
    return true ? list : list;
  }

  ArrayList<? super A> getSuperList() {
    return true ? superList : superList;
  }

  ArrayList<? extends A> getExtendsList() {
    return true ? extendsList : extendsList;
  }
}
####
RC3 and RC4 shows for the conditional expression in getSuperList the 
error "Type mismatch: cannot convert from ArrayList<capture-of ? extends 
Object> to ArrayList<? super A>" and for the conditional expression in 
getExtendsList the error "Type mismatch: cannot convert from ArrayList<capture-
of ? extends Object> to ArrayList<? extends A>".

When compiling the same code with javac, only the method getSuperList is marked 
to be incorrect:
Class.java:14: incompatible types
found   : java.util.ArrayList<capture of ? extends java.lang.Object>
required: java.util.ArrayList<? super A>
                return true ? superList : superList;
                            ^
1 error
but the method getExtendsList compiles without errors.