静态数据的初始化

package me.ybleeho;
class Bowl{
    Bowl(int marker){
        System.out.println("Bowl"+marker);
    }
    void f1(int marker){
        System.out.println("f1"+marker);
    }
}
class Table{
    static Bowl bowl1=new Bowl(1);
    Table(){
        System.out.println("Table()");
        bowl2.f1(1);
    }
    void f2(int marker){
        System.out.println("f2"+marker);
    }
    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.f1(2);
    }
    void f3(int marker){
        System.out.println("f3"+marker);
    }
    static Bowl bowl5=new Bowl(5);
}
public class StaticInitialization {
    public static void main(String []args){
        System.out.println("Creating new Cupboard in main()");
        new Cupboard();
        System.out.println("Creating new Cupboard in main()");
        new Cupboard();
        table.f2(1);
        cupboard.f3(1);
    }
    static Table table=new Table();
    static Cupboard cupboard=new Cupboard();
}

输出：

Bowl1
Bowl2
Table()
f11
Bowl4
Bowl5
Bowl3
Cupboard()
f12
Creating new Cupboard in main()
Bowl3
Cupboard()
f12
Creating new Cupboard in main()
Bowl3
Cupboard()
f12
f21
f31

静态初始化只有在必要时进行。初始化顺序是静态对象然后非静态对象。