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Class and object initialization

Learn how to prepare classes and objects for use in an executing program

By Jeff Friesen, JavaWorld.com, 11/02/01

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Page 2 of 9

Listing 2. ClassInitializationDemo2.java

// ClassInitializationDemo2.java
class ClassInitializationDemo2
{
   static boolean b = true;
   static byte by = 1;
   static char c = 'A';
   static double d = 1.2;
   static float f = 3.4f;
   static int i = 2;
   static long l = 3;
   static short s = 4;
   static String st = "abc";
   public static void main (String [] args)
   {
      System.out.println ("b = " + b);
      System.out.println ("by = " + by);
      System.out.println ("c = " + c);
      System.out.println ("d = " + d);
      System.out.println ("f = " + f);
      System.out.println ("i = " + i);
      System.out.println ("l = " + l);
      System.out.println ("s = " + s);
      System.out.println ("st = " + st);
   }
}


In contrast to ClassInitializationDemo1, in ClassInitializationDemo2 a class field initializer explicitly assigns a nondefault value to each class field. Simply put, a class field initializer consists of the assignment operator (=) and an expression that the JVM evaluates after a class loads and before any of that class's developer-specified methods execute. The assignment operator assigns the expression's value to the associated class field. When run, ClassInitializationDemo2 produces the following output:

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