instance initializer

虽然用Java一段时间了，不过还是第一次听到 instance initializer （实例初始化块）
以前知道有一个 static initializer （静态初始化块）会在类加载的时候执行。
instance initializer 则是在构造函数执行过程中的某一时刻执行。见代码：

// LoadOrder.java

public class LoadOrder {
        private Property _property = new Property();

        {       // instance initializer
                System.out.println("{ Load Block 1 }");
        }

        static { // static initializer
                System.out.println("{ static 1 }");
        }

        public LoadOrder() {
                System.out.println("LoadOrder()");
                _property = new Property(this);
        }

        {
                System.out.println("{ Load Block 2 }");
        }

        static {
                System.out.println("{ static 2 }");
        }

        public static void main(String[] args) {
                System.out.println("==== main() 1 ====");
                new LoadOrder();
                System.out.println("==== main() 2 ====");
                new LoadOrder();
                Property referee = new Property();
        }
}

class Property {
        public Property() {
                System.out.println("Property()");
        }
        public Property(Object owner) {
                System.out.println("Property(Object)");
        }
}
// EOF

运行结果如下：

{ static 1 }
{ static 2 }
==== main() 1 ====
Property()
{ Load Block 1 }
{ Load Block 2 }
LoadOrder()
Property(Object)
==== main() 2 ====
Property()
{ Load Block 1 }
{ Load Block 2 }
LoadOrder()
Property(Object)
Property()

//EOF