selfboundingandcovariantarguments.java

Thinking in JAVA第四版源代码

//: generics/SelfBoundingAndCovariantArguments.java

interface SelfBoundSetter<T extends SelfBoundSetter<T>> {
  void set(T arg);
}

interface Setter extends SelfBoundSetter<Setter> {}

public class SelfBoundingAndCovariantArguments {
  void testA(Setter s1, Setter s2, SelfBoundSetter sbs) {
    s1.set(s2);
    // s1.set(sbs); // Error:
    // set(Setter) in SelfBoundSetter<Setter>
    // cannot be applied to (SelfBoundSetter)
  }
} ///:~