Java初始化顺序

先初始化父类的静态代码--->初始化子类的静态代码-->初始化父类的非静态代码--->初始化父类构造函数--->初始化子类非静态代码--->初始化子类构造函数

 

测试代码：

abstract class base
{         
    public int age=getNumber(100);        
    static{         
        System.out.println("base static block");       
    }
       
    {          
        System.out.println("base nonstatic block");        
    }   
    static int sage=getNumber(50);   
    base(){       
        System.out.println(age);       
        System.out.println("base start");
        draw();//会调用子类覆盖后的方法，这儿是0！      
        System.out.println("base end");           
    }   
    static int getNumber(int base){       
        System.out.println("base.getNumber int"+base);
        return base;   
    }   
    public  void draw(){       
        System.out.println("base.draw");   
        }
}

public class initializeOrder extends base{   
    public int age=getNumber(1001);   
    private int _radius=getNumber(10);   
    static int sage=getNumber(250);   
    static{       
        System.out.println("subclass static block");   
    }   
    {       
        System.out.println("subclass nonstatic block"); 
    }
    initializeOrder(int radius){       
        _radius=radius;       
        System.out.println(age);
        draw();//这儿是1000
        System.out.println("initializeOrder initialized");   
    }   
    public void draw(){
        System.out.println("initializeOrder.draw "+_radius);   
        }     
    public static void main(String[] args) {        // TODO Auto-generated method stub      
        new initializeOrder(1000);   

    }

}

输出为：

base static block
base.getNumber int50
base.getNumber int250
subclass static block
base.getNumber int100
base nonstatic block
100
base start
initializeOrder.draw 0
base end
base.getNumber int1001
base.getNumber int10
subclass nonstatic block
1001
initializeOrder.draw 1000
initializeOrder initialized