抽象类的实例化

eg:

public abstract class Base {

public Base(int i){
System.out.println("Base constructor.i="+i);
}
public abstract void f();
}

public class AnonymousConstructor {
public static Base getBase(int i){
return new Base(i){
public void f(){
System.out.println("In anonymous f()");
}
};
}
public static void main(String[] args) {
Base base = getBase(47);
base.f();

[error:

Base b = new Base(2);//Cannot instantiate the type Base]
}

}

result:

Base constructor.i=47

In anonymous f()