Eclipse里面能执行，但命令行里不能执行class文件

报错：找不到或无法加载主类

1.重新设置了环境变量，打开cmd输入java,javac,java- version检测无误。

但是命令行里到MyTest.class目录输入 java MyTest依然显示：错误，找不到或无法加载主类MyTest

解决：java文件的类名必须与文件名一致

但针对之前一个项目，此方法仍然不适用，但至此排除环境变量设置问题

2.其实遇到这个问题，我想大概不会是几个低级错误照成的，网上主要说的几点是：1.注意大小写。2.注意别java TCPSocket.clas，别加class。3.注意路径。

个人感觉也就是第三个需要注意，前两个我就不说了。

关于路径问题。注意，不用像网上说的，非要把你class的路径配置到classpath下，只要在classpath的配置最前面加上“.;”即可。“.”代表当前目录下即可，“;”代表间隔。

例如的我配置：

classpath：.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar

如果这样还是不好使，那么真正的问题一定是如下的：

查看你的类文件，里面是不是在某一个包下。如果是，那就找到问题所在了。拿我的问题来说：

我的类文件是TCPServer.java，是在com.socket这个包里面。

那一般的做法都是进入cmd中，找到该文件的目录。比如：D:\java\eclipseworkspace\TestSocket\src\com\socket>_

大家是不是会尝试输入 java TCPServer 提示错误，然后尝试java com/socket/TCPServer还是提示错误。

其实正确的做法是：

退回上一级目录D:\java\eclipseworkspace\TestSocket\com\

然后运行java com/socket/TCPServer. OK啦！！！

这样：D:\java\eclipseworkspace\TestSocket\src>java com/socket/TCPClient

亲测有效

我的MyTest.class文件地址：C:\Users\Administrator\workspace\MyfirstApp\src\test\MyTest.class

我在cmd里先到路径：

C：\Users\Administrator\workspace\MyfirstApp\src

然后输入命令java test\MyTest

然而在命令行里出来的跟Eclipse里面出来的不同.

Eclipse里面输出：

99 bottles of beer on the wall

99 bottles of beer.

Take one down

Pass it around.

98 bottlesof beer on the wall

98 bottles of beer on the wall

98 bottles of beer.

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97 bottlesof beer on the wall

97 bottles of beer on the wall

97 bottles of beer.

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96 bottlesof beer on the wall

96 bottles of beer on the wall

96 bottles of beer.

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95 bottlesof beer on the wall

95 bottles of beer on the wall

95 bottles of beer.

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94 bottlesof beer on the wall

94 bottles of beer on the wall

94 bottles of beer.

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93 bottlesof beer on the wall

93 bottles of beer on the wall

93 bottles of beer.

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92 bottlesof beer on the wall

92 bottles of beer on the wall

92 bottles of beer.

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91 bottlesof beer on the wall

91 bottles of beer on the wall

91 bottles of beer.

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90 bottlesof beer on the wall

90 bottles of beer on the wall

90 bottles of beer.

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89 bottlesof beer on the wall

89 bottles of beer on the wall

89 bottles of beer.

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Pass it around.

88 bottlesof beer on the wall

88 bottles of beer on the wall

88 bottles of beer.

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Pass it around.

87 bottlesof beer on the wall

87 bottles of beer on the wall

87 bottles of beer.

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86 bottlesof beer on the wall

86 bottles of beer on the wall

86 bottles of beer.

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Pass it around.

85 bottlesof beer on the wall

85 bottles of beer on the wall

85 bottles of beer.

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84 bottlesof beer on the wall

84 bottles of beer on the wall

84 bottles of beer.

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83 bottlesof beer on the wall

83 bottles of beer on the wall

83 bottles of beer.

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82 bottlesof beer on the wall

82 bottles of beer on the wall

82 bottles of beer.

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81 bottlesof beer on the wall

81 bottles of beer on the wall

81 bottles of beer.

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80 bottlesof beer on the wall

80 bottles of beer on the wall

80 bottles of beer.

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79 bottlesof beer on the wall

79 bottles of beer on the wall

79 bottles of beer.

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78 bottlesof beer on the wall

78 bottles of beer on the wall

78 bottles of beer.

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77 bottlesof beer on the wall

77 bottles of beer on the wall

77 bottles of beer.

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76 bottlesof beer on the wall

76 bottles of beer on the wall

76 bottles of beer.

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75 bottlesof beer on the wall

75 bottles of beer on the wall

75 bottles of beer.

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74 bottlesof beer on the wall

74 bottles of beer on the wall

74 bottles of beer.

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73 bottlesof beer on the wall

73 bottles of beer on the wall

73 bottles of beer.

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Pass it around.

72 bottlesof beer on the wall

72 bottles of beer on the wall

72 bottles of beer.

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71 bottlesof beer on the wall

71 bottles of beer on the wall

71 bottles of beer.

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Pass it around.

70 bottlesof beer on the wall

70 bottles of beer on the wall

70 bottles of beer.

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69 bottlesof beer on the wall

69 bottles of beer on the wall

69 bottles of beer.

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68 bottlesof beer on the wall

68 bottles of beer on the wall

68 bottles of beer.

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67 bottlesof beer on the wall

67 bottles of beer on the wall

67 bottles of beer.

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66 bottlesof beer on the wall

66 bottles of beer on the wall

66 bottles of beer.

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65 bottlesof beer on the wall

65 bottles of beer on the wall

65 bottles of beer.

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64 bottlesof beer on the wall

64 bottles of beer on the wall

64 bottles of beer.

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Pass it around.

63 bottlesof beer on the wall

63 bottles of beer on the wall

63 bottles of beer.

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Pass it around.

62 bottlesof beer on the wall

62 bottles of beer on the wall

62 bottles of beer.

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Pass it around.

61 bottlesof beer on the wall

61 bottles of beer on the wall

61 bottles of beer.

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Pass it around.

60 bottlesof beer on the wall

60 bottles of beer on the wall

60 bottles of beer.

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59 bottlesof beer on the wall

59 bottles of beer on the wall

59 bottles of beer.

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58 bottlesof beer on the wall

58 bottles of beer on the wall

58 bottles of beer.

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57 bottlesof beer on the wall

57 bottles of beer on the wall

57 bottles of beer.

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56 bottlesof beer on the wall

56 bottles of beer on the wall

56 bottles of beer.

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55 bottlesof beer on the wall

55 bottles of beer on the wall

55 bottles of beer.

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54 bottlesof beer on the wall

54 bottles of beer on the wall

54 bottles of beer.

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53 bottlesof beer on the wall

53 bottles of beer on the wall

53 bottles of beer.

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52 bottlesof beer on the wall

52 bottles of beer on the wall

52 bottles of beer.
Take one down

Pass it around.

51 bottlesof beer on the wall

51 bottles of beer on the wall

51 bottles of beer.

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50 bottlesof beer on the wall

50 bottles of beer on the wall

50 bottles of beer.

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49 bottlesof beer on the wall

49 bottles of beer on the wall

49 bottles of beer.

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48 bottlesof beer on the wall

48 bottles of beer on the wall

48 bottles of beer.

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47 bottlesof beer on the wall

47 bottles of beer on the wall

47 bottles of beer.

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Pass it around.

46 bottlesof beer on the wall

46 bottles of beer on the wall

46 bottles of beer.

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Pass it around.

45 bottlesof beer on the wall

45 bottles of beer on the wall

45 bottles of beer.

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Pass it around.

44 bottlesof beer on the wall

44 bottles of beer on the wall

44 bottles of beer.

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Pass it around.

43 bottlesof beer on the wall

43 bottles of beer on the wall

43 bottles of beer.

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42 bottlesof beer on the wall

42 bottles of beer on the wall

42 bottles of beer.

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41 bottlesof beer on the wall

41 bottles of beer on the wall

41 bottles of beer.

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Pass it around.

40 bottlesof beer on the wall

40 bottles of beer on the wall

40 bottles of beer.

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39 bottlesof beer on the wall

39 bottles of beer on the wall

39 bottles of beer.

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38 bottlesof beer on the wall

38 bottles of beer on the wall

38 bottles of beer.

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37 bottlesof beer on the wall

37 bottles of beer on the wall

37 bottles of beer.

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36 bottlesof beer on the wall

36 bottles of beer on the wall

36 bottles of beer.

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35 bottlesof beer on the wall

35 bottles of beer on the wall

35 bottles of beer.

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34 bottlesof beer on the wall

34 bottles of beer on the wall

34 bottles of beer.

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33 bottlesof beer on the wall

33 bottles of beer on the wall

33 bottles of beer.

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32 bottlesof beer on the wall

32 bottles of beer on the wall

32 bottles of beer.

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31 bottlesof beer on the wall

31 bottles of beer on the wall

31 bottles of beer.

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30 bottlesof beer on the wall

30 bottles of beer on the wall

30 bottles of beer.

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Pass it around.

29 bottlesof beer on the wall

29 bottles of beer on the wall

29 bottles of beer.

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Pass it around.

28 bottlesof beer on the wall

28 bottles of beer on the wall

28 bottles of beer.

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Pass it around.

27 bottlesof beer on the wall

27 bottles of beer on the wall

27 bottles of beer.

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26 bottlesof beer on the wall

26 bottles of beer on the wall

26 bottles of beer.

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Pass it around.

25 bottlesof beer on the wall

25 bottles of beer on the wall

25 bottles of beer.

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Pass it around.

24 bottlesof beer on the wall

24 bottles of beer on the wall

24 bottles of beer.

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Pass it around.

23 bottlesof beer on the wall

23 bottles of beer on the wall

23 bottles of beer.

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Pass it around.

22 bottlesof beer on the wall

22 bottles of beer on the wall

22 bottles of beer.

Take one down

Pass it around.

21 bottlesof beer on the wall

21 bottles of beer on the wall

21 bottles of beer.

Take one down

Pass it around.

20 bottlesof beer on the wall

20 bottles of beer on the wall

20 bottles of beer.

Take one down

Pass it around.

19 bottlesof beer on the wall

19 bottles of beer on the wall

19 bottles of beer.

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Pass it around.

18 bottlesof beer on the wall

18 bottles of beer on the wall

18 bottles of beer.

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Pass it around.

17 bottlesof beer on the wall

17 bottles of beer on the wall

17 bottles of beer.

Take one down

Pass it around.

16 bottlesof beer on the wall

16 bottles of beer on the wall

16 bottles of beer.

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Pass it around.

15 bottlesof beer on the wall

15 bottles of beer on the wall

15 bottles of beer.

Take one down

Pass it around.

14 bottlesof beer on the wall

14 bottles of beer on the wall

14 bottles of beer.

Take one down

Pass it around.

13 bottlesof beer on the wall

13 bottles of beer on the wall

13 bottles of beer.

Take one down

Pass it around.

12 bottlesof beer on the wall

12 bottles of beer on the wall

12 bottles of beer.

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Pass it around.

11 bottlesof beer on the wall

11 bottles of beer on the wall

11 bottles of beer.

Take one down

Pass it around.

10 bottlesof beer on the wall

10 bottles of beer on the wall

10 bottles of beer.

Take one down

Pass it around.

9 bottlesof beer on the wall

9 bottles of beer on the wall

9 bottles of beer.

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Pass it around.

8 bottlesof beer on the wall

8 bottles of beer on the wall

8 bottles of beer.

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Pass it around.

7 bottlesof beer on the wall

7 bottles of beer on the wall

7 bottles of beer.

Take one down

Pass it around.

6 bottlesof beer on the wall

6 bottles of beer on the wall

6 bottles of beer.

Take one down

Pass it around.

5 bottlesof beer on the wall

5 bottles of beer on the wall

5 bottles of beer.

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Pass it around.

4 bottlesof beer on the wall

4 bottles of beer on the wall

4 bottles of beer.

Take one down

Pass it around.

3 bottlesof beer on the wall

3 bottles of beer on the wall

3 bottles of beer.

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Pass it around.

2 bottlesof beer on the wall

2 bottles of beer on the wall

2 bottles of beer.

Take one down

Pass it around.

1 bottlesof beer on the wall

1 bottle of beer on the wall

1 bottle of beer.

Take one down

Pass it around.

No more bottles of beer on the wall

而命令行里面输出其余一样，但是从59瓶开始数到最后，为什么会这样？