Classes Invólucros para tipos primitivos

Entendo códigos.
Apesar de parecer enorme, veja abaixo a explicação dos códigos que praticamente se repetem para fins didáticos:

1. import java.io.PrintStream;
2. 
   
3. public class ClassesInvolucros {
4. public static void main(String[] args) {
5. PrintStream sd = System.out;
7. Boolean bl1 = new Boolean (true);
8. Boolean bl2 = new Boolean ("false");
9. Character ch = new Character ('A');
10. Byte bt1 = new Byte ((byte) 127);
11. Byte bt2 = new Byte ("-128");
12. Short st1 = new Short ((short) 32767);
13. Short st2 = new Short ("-32768");
14. Integer it1 = new Integer (2147483647);
15. Integer it2 = new Integer ("-2147483648");
16. Long lg1 = new Long (9223372036854775807L);
17. Long lg2 = new Long ("-9223372036854775808");
18. Float fl1 = new Float (3.4028E+38f);
19. Float fl2 = new Float ("-3.4028E+38");
20. Double db1 = new Double (1.7976E+308);
21. Double db2 = new Double ("-1.7976E+308");
23. System.out.println("Resultados");
24. sd.println("bl1 =\t" + bl1.booleanValue());
25. sd.println("bl2 =\t" + bl2.booleanValue());
26. sd.println("ch =\t" + ch.charValue());
27. sd.println("bt1 =\t" + bt1.byteValue());
28. sd.println("bt2 =\t" + bt2.byteValue());
29. sd.println("st1 =\t" + st1.shortValue());
30. sd.println("st2 =\t" + st2.shortValue());
31. sd.println("it1 =\t" + it1.intValue());
32. sd.println("it2 =\t" + it2.intValue());
33. sd.println("lg1 =\t" + lg1.longValue());
34. sd.println("lg2 =\t" + lg2.longValue());
35. sd.println("fl1 =\t" + fl1.floatValue());
36. sd.println("fl2 =\t" + fl2.floatValue());
37. sd.println("db1 =\t" + db1.doubleValue());
38. sd.println("db2 =\t" + db2.doubleValue());
40. }
41. }

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Este é o resultado do código acima: