noncovariantgenerics.java

来自「thinking in java 书中源码 第四版」· Java 代码 · 共 9 行

//: generics/NonCovariantGenerics.java
// {CompileTimeError} (Won't compile)
import java.util.*;

public class NonCovariantGenerics {
  // Compile Error: incompatible types:
  List<Fruit> flist = new ArrayList<Apple>();
} ///:~