类加载与初始化顺序

<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">1、自下而上加载类的编译代码</span>

运行java程序时，首先要找main（），于是启动加载器加载main对应类的编译代码，在加载过程中，若发现有基类，则加载基类，以此类推。也就是从基类向下加载

2、自上而下的初始化static

可以看作是类加载时进行的，static初始化顺序，就是类加载顺序

3、默认初始化：基本类型和对象类型

4、基类构造器

5、变量定义的顺序显式初始化

6、自身的构造器

7、例：

class Meal {
Meal() { System.out.println("Meal()"); }
static {
System.out.println("Meal static");
}
}

class Bread {
Bread() { System.out.println("Bread()"); }
}

class Cheese {
Cheese() { System.out.println("Cheese()"); }
static {
System.out.println("Cheese static");
}
}

class Lettuce {
Lettuce() { System.out.println("Lettuce()"); }
}

class Lunch extends Meal {
Lunch() { System.out.println("Lunch()"); }
static {
System.out.println("Lunch static");
}
}

class PortableLunch extends Lunch {
PortableLunch() { System.out.println("PortableLunch()"); }
static {
System.out.println("PortableLunch static");
}
}

public class Sandwich extends PortableLunch {
private Bread b = new Bread();
private Cheese c = new Cheese();

public Sandwich() { System.out.println("Sandwich()"); }
private Lettuce l = new Lettuce();
static {
System.out.println("Sandwich static");
}

public static void main(String[] args) {
// TODO Auto-generated method stub
new Sandwich();
}

}