/**

* This is a good example to dispel the confusion about class and instance initializer.

* There is some order to obey.

* After class loaded, <clinit> executed. (class initializer top-down); for one time

* After new allocates memory for an object, <init> executed.(instance initializer top-down).maybe many times.

*/

public class InitializerDemo{

static double double1;

double double2;

static int int1;

int int2;

static String string1;

String string2;

static{

System.out.println("[class] double1 = " + double1);

System.out.println("[class] int1 = " + int1);

System.out.println("[class] string1 = " + string1);

System.out.println();

}

{

System.out.println("[instance] double2 = " + double2);

System.out.println("[instance] int2 = " + int2);

System.out.println("[instance] string2 = " + string2);

System.out.println();

}

static{

double1 = 1.0;

int1 = 1000000000;

string1 = "abc";

}

{

double2 = 1.0;

int2 = 1000000000;

string2 = "abc";

}

InitializerDemo(){

System.out.println("InitDemo() called.");

System.out.println();

}

static double double3 = 10.0;

double double4 = 10.0;

static{

System.out.println("[class] double3 = " + double3);

System.out.println();

}

{

System.out.println("[instance] double4 = " + double4);

System.out.println();

}

public static void main(String[] args){

System.out.println("main() started.");

System.out.println();

System.out.println("[class] double1 = " + double1);

System.out.println("[class] double3 = " + double3);

System.out.println("[class] int1 = " + int1);

System.out.println("[class] string1 = " + string1);

System.out.println();

for(int i = 0; i < 2; i++){

System.out.println("About to create InitializerDemo object.");

System.out.println();

InitializerDemo id = new InitializerDemo();

System.out.println("InitializerDemo instance id created.");

System.out.println();

System.out.println("[instance] id.double2 = " + id.double2);

System.out.println("[instance] id.double4 = " + id.double4);

System.out.println("[instance] id.int2 = " + id.int2);

System.out.println("[instance] id.string2 = " + id.string2);

System.out.println();

}

}

}