// reflection/ClassInitialization.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

class Initable {

static final int STATIC_FINAL = 47;

static final int STATIC_FINAL2 =

ClassInitialization.rand.nextInt(1000);

static {

System.out.println("Initializing Initable");

}

}

class Initable2 {

static int staticNonFinal = 147;

static {

System.out.println("Initializing Initable2");

}

}

class Initable3 {

static int staticNonFinal = 74;

static {

System.out.println("Initializing Initable3");

}

}

public class ClassInitialization {

public static Random rand = new Random(47);

public static void

main(String[] args) throws Exception {

Class initable = Initable.class;

System.out.println("After creating Initable ref");

// Does not trigger initialization:

System.out.println(Initable.STATIC_FINAL);

// Triggers initialization:

System.out.println(Initable.STATIC_FINAL2);

// Triggers initialization:

System.out.println(Initable2.staticNonFinal);

Class initable3 = Class.forName("Initable3");

System.out.println("After creating Initable3 ref");

System.out.println(Initable3.staticNonFinal);

}

}

/* Output:

After creating Initable ref

47

Initializing Initable

258

Initializing Initable2

147

Initializing Initable3

After creating Initable3 ref

74

*/