Java面试题之static、构造函数 、继承

非静态字段的初始化其实都在构造器中，优先执行 静态方法

package com.hp.deom;

import com.hp.demo.Demo;

public class demo {

private static demo d = new demo();
private SubClass t = new SubClass();//可以看成在demo构造函数中t=new SubClass()

static
{
System.out.println(3);
}
public demo()
{

//t=new SubClass();

System.out.println(4);}public static void main(String [] args){System.out.println("Hello");}}class SuperClass{SuperClass(){System.out.println("构造SuperClass");}}class SubClass{static {System.out.println(1);}public SubClass(){System.out.println(2);}}

运行结果

1

2

4

3

Hello