构造器初始化（static）

package demo;

/*
 * 在类 的内部，变量定义的先后顺序决定了初始化的顺序。即使变量定义散布于方法定义之间，
 * 它们仍旧会在任何方法（包括构造器）被调用之前得到初始化。
 */
public class Test {
    public static void main(String[] args) {
        House h = new House();
        h.f();
    }
}

class Window {
    Window(int maker) {
        System.out.println("Window(" + maker + ")");
    }
}

class House {
    Window w1 = new Window(1);

    House() {
        System.out.println("House()");
        w3 = new Window(33);
    }

    Window w2 = new Window(2);

    void f() {
        System.out.println("f()");
    }

    Window w3 = new Window(3);
}
//结果：
//Window(1)
//Window(2)
//Window(3)
//House()
//Window(33)
//f()

package demo;

/*
 * 先执行static修饰的成员，而且只被执行一次
 */
public class Test1 {
    public static void main(String[] args) {
        System.out.println("Creating new Cup() in main");
        new Cup();
        System.out.println("Creating new Cup() in main");
        new Cup();
        table.f2(1);
        cup.f3(1);
    }

    static Table table = new Table();
    static Cup cup = new Cup();
}

class Bowl {
    Bowl(int maker) {
        System.out.println("Bowl(" + maker + ")");
    }

    void f1(int maker) {
        System.out.println("f1(" + maker + ")");
    }
}

class Table {
    static Bowl bowl1 = new Bowl(1);

    Table() {
        System.out.println("Table()");
        bowl1.f1(1);
    }

    void f2(int maker) {
        System.out.println("f2(" + maker + ")");
    }

    static Bowl bowl2 = new Bowl(2);
}

class Cup {
    Bowl bowl3 = new Bowl(3);
    static Bowl bowl4 = new Bowl(4);

    Cup() {
        System.out.println("Cup()");
        bowl4.f1(2);
    }

    void f3(int maker) {
        System.out.println("f3(" + maker + ")");
    }

    static Bowl bowl5 = new Bowl(5);
}
结果：
Bowl(1)
Bowl(2)
Table()
f1(1)
Bowl(4)
Bowl(5)
Bowl(3)
Cup()
f1(2)
Creating new Cup() in main
Bowl(3)
Cup()
f1(2)
Creating new Cup() in main
Bowl(3)
Cup()
f1(2)
f2(1)
f3(1)