Description Lars Wunderlich 2004-10-28 14:27:30 EDT

The following source was tested with: Eclipse 3.1 200410260800 Integration 
Build, Sun JDK 5.0 with source level 1.5 turned on for Eclipse project.

JDK 5 was extended to include return types into full method signature check 
when overloading Generics methods inside a class. Therefore the following code 
snippet gets a clear compile in Sun JDK 5 whereas Eclipse does not compile the 
source with the following two errors:
1.) The return type is incompatible with InterfaceB.getValue(String), 
InterfaceA.getValue(String)
2.) Duplicate method getValue(String) in type ImplementationClass

InterfaceA.java file:

public interface InterfaceA {
	<T extends Integer> T getValue(String value);
}

InterfaceB.java file:

public interface InterfaceB {
	<T extends Double> T getValue(String value);
}

ImplementationClass.java file:

public class ImplementationClass implements InterfaceA, InterfaceB {
	public <T extends Integer> T getValue(String value) {
		return null;
	}
	public <T extends Double> T getValue(String value) { 
		return null;
	}
}

And there is also another problem. The IDE does not support quick fixes when 
implementing these two interface types in empty implementation class. There is 
a quick fix offered for adding unimplemented methods but nothing happens when 
selecting the quick fix.