查漏补缺2（面试小题目）

//面试
public class Main
{
class demo
{

}
public static void main(String[] args)
{

new demo();//报错，因为主函数是静态的	所以class demo要加static
//static不能使用this
}
public  void show()
{
new demo();//前面实际上省略this
}
}

class in
{
void set()
{
Object obj = new Object()//匿名内部类的子类对象，并向上转型为Object
{
public void show()
{
System.out.print("sdf");
}
};
obj.show();//向上转型，限制了子类对象的特有方法，所以编译失败
}
}

public class Main
{
public static void main(String[] args)
{
new in().set();
}
}

class Fu
{
public Fu()
{
show();
}
void show()
{
System.out.println("呵呵");
}
}
class Zi extends Fu
{
int num = 9;
Zi()
{

System.out.println("子构造器..."+num);
}

void show()
{
System.out.println("shiow..."+num);
}
}

public class Main
{
public static void main(String[] args)
{
new Zi();
}
}

class Zi
{
int num = 9;

{
System.out.println("shiow..."+num);
}
Zi()
{

System.out.println("shiow2..."+num);
}

}

public class Main
{
public static void main(String[] args)
{
new Zi();
}
}

class Fu
{
Fu()
{
System.out.println("fu++++++++");//3
show();
}
void show()
{
System.out.print("hehe");
}
}
class Zi extends Fu
{
int num = 9;

{
System.out.println("shiow..."+num);
num = 10;
}
Zi()
{
super();//2
//可视初始化 5
//构造代码块初始化 6
System.out.println("shiow2..."+num);//7
}

void show()//4
{
System.out.println("zi show..."+num);
}

}

public class Main
{
public static void main(String[] args)
{
new Zi();//1:num = 0
}
}