内部类四：内部类的子类

package chapter10;

class WithInner{
    class Inner{
        
    }
}



public class InheritInner extends WithInner.Inner {
    
    /**
     * 内部类的导出类的构造器必须有一个带有内部类的外围类的参数,如果没有会报如下的错
     * No enclosing instance of type WithInner is available due to some intermediate constructor invocation
     * @param wi
     */
    InheritInner(WithInner wi){
        wi.super();
    }
    
    public static void main(String[] args) {
        //创建内部类的导出类的对象前，必须先创建内部类的外围类的对象，并传入到导出类的构造器中
        WithInner wi=new WithInner();
        InheritInner ii=new InheritInner(wi);
    }
}