java class 初始化

the order of execution is: static initializer, instance initializer, constructor 

1.Initializing Fields

public class BedAndBreakfast {



    // initialize to 10

    public static int capacity = 10;



    // initialize to false

    private boolean full = false;

}

2.Static Initialization Blocks

static {

    // whatever code is needed for initialization goes here

}

3.Initializing Instance Members

{

    // whatever code is needed for initialization goes here

}

4. constructor

5. example

public class t1 {



    {

        System.out.println("Empty block");

    }

    static {

        System.out.println("Static block");

    }



    public t1() {

        System.out.println("constructor block");

    }



    public static void main(String[] args) {

        t1 t = new t1();

    }

}

http://docs.oracle.com/javase/tutorial/java/javaOO/initial.html Initializing Fields

http://www.javatpoint.com/instance-initializer-block  Instance initializer block: