Java中的bit、byte、字母、漢字之間的關系

Java中的bit、byte、字母、漢字之間的關系：

2. package com.jadyer.demo;
5. /**
6. * Java中的位,字節,字母,漢字之間的關系
7. * @see ====================================================
8. * @see 1 bit = 1 二進制數據
9. * @see 1 byte = 8 bit (范圍:-128到+127)
10. * @see 1 字母 = 1 byte = 8 bit
11. * @see 1 漢字 = 2 byte = 16 bit
12. * @see ====================================================
13. * @author 玄玉<http://blog.csdn/net/jadyer>
14. * @create Aug 20, 2012 10:28:20 AM
15. */
16. public class ByteDemo {
17. /**
18. * @see 控制台打印結果,如下
19. * @see 4
20. * @see 4
21. * @see ----------------------------
22. * @see str=ABab
23. * @see 65
24. * @see 66
25. * @see 97
26. * @see 98
27. * @see ----------------------------
28. * @see name=玄玉
29. * @see -48
30. * @see -2
31. * @see -45
32. * @see -15
33. * @see ----------------------------
34. */
35. @SuppressWarnings("unused")
36. public static void main(String[] args) {
37. //byte bb11 = 128; //cannot convert from int to byte
38. //byte bb22 = -129; //cannot convert from int to byte
39. byte bb11 = 127;
40. byte bb22 = -128;
41. byte bb33 = 56;
43. //byte bb44 = '玄'; //錯誤,因為: 1漢字==2字節
44. //byte bb55 = 'bb'; //錯誤,因為: 'bb'==2字節
45. byte bb44 = 'b';
46. byte bb55 = 'B';
47. byte bb66 = 'Z';
49. //int i11 = "玄玉"; //1 int = 32 bit, but int is numeral
50. //short ss = '玄玉'; //1 short = 2 byte = 16 bit = 1 漢字
51. short ss11 = '玄';
53. //char cc11 = '玄玉'; //這樣是不可以的
54. //char cc22 = 'cc'; //這樣是不可以的
55. char cc11 = '玄';
56. char cc22 = 'c';
58. String str = "ABab";
59. byte[] data = str.getBytes();
60. System.out.println(str.length());
61. System.out.println(data.length);
62. System.out.println("----------------------------");
64. System.out.println("str=" + new String(data));
65. for(int i=0; i<data.length; i++){
66. System.out.println(data[i]);
67. }
68. System.out.println("----------------------------");
70. byte[] name = "玄玉".getBytes();
71. System.out.println("name=" + new String(name));
72. for(int i=0; i<name.length; i++){
73. System.out.println(name[i]);
74. }
75. System.out.println("----------------------------");
76. }
77. }