变量初始化顺序

（1）变量定义的先后顺序决定初始化顺序，即使变量定义散布在方法定义之间，他们仍旧会在方法被调用之前得到初始化，构造方法也是特殊的方法

（2）执行顺序：静态块， 静态变量，非静态变量，构造方法

每次在创建对象的时候非静态变量都会被初始化

静态对象只会在类加载的时候被初始化一次

 

public class Initialization {

    static Table table = new Table();
    static Cupboard cupboard = new Cupboard();
    @Test
    public void test() {
        System.out.println("start...");
        new Cupboard();
        System.out.println("restart...");
        new Cupboard();
        table.method(1);
        cupboard.method(1);
    }
}

class Bowl {
    public Bowl(int maker) {
        System.out.println("Bowl " + maker);
    }
    public void method(int maker){
        System.out.println("Bowl method " + maker);
    }
}
class Table{
    static Bowl bowl1 = new Bowl(1);
    Table(){
        System.out.println("Table ");
        bowl2.method(2);
    }
    public void method(int maker){
        System.out.println("Table method " + maker);
    }
    static Bowl bowl2 = new Bowl(2);
}

class Cupboard{
    Bowl bowl3 = new Bowl(3);
    static Bowl bowl4 = new Bowl(4);
    Cupboard(){
        System.out.println("Cupboard ");
        bowl4.method(2);
    }
    public void method(int maker){
        System.out.println("Cupboard method " + maker);
    }
    static Bowl bowl5 = new Bowl(5);
}

 结果：

Bowl 1

Bowl 2

Table 

Bowl method 2

Bowl 4

Bowl 5

Bowl 3

Cupboard 

Bowl method 2

start...

Bowl 3

Cupboard 

Bowl method 2

restart...

Bowl 3

Cupboard 

Bowl method 2

Table method 1

Cupboard method 1