Java class System

setSecurityManager

1. Sets the System security. This value can only be set once.

2. Parameters:
3. s - the security manager
4. Throws: SecurityException
5. If the SecurityManager has already been set.

   getSecurityManager

6. public static SecurityManager getSecurityManager()

7. Gets the system security interface.

   currentTimeMillis

8. public static long currentTimeMillis()

9. Returns the current time in milliseconds GMT since the epoch (00:00:00 UTC, January 1, 1970). It is a signed 64 bit integer, and so it will not overflow until the year 292280995.

10. See Also:
11. Date

    arraycopy

12. public static void arraycopy(Object src, int srcPos, Object dest, int destPos, int length)

13. Copies an array from the source array, beginning at the specified position, to the specified position of the destination array. This method does not allocate memory for the destination array. The memory must already be allocated.

14. Parameters:
15. src - the source data
16. srcpos - start position in the source data
17. dest - the destination
18. destpos - start position in the destination data
19. length - the number of array elements to be copied
20. Throws: ArrayIndexOutOfBoundsException
21. If copy would cause
22. access of data outside array bounds.
23. Throws: ArrayStoreException
24. If an element in the src array could
25. could not be stored into the destination array due
26. to a type mismatch

    getProperties

27. public static Properties getProperties()

28. Gets the System properties.

    setProperties

29. public static void setProperties(Properties props)

30. Sets the System properties to the specified properties.

31. Parameters:
32. props - the properties to be set

    getProperty

33. public static String getProperty(String key)

34. Gets the System property indicated by the specified key.

35. Parameters:
36. key - the name of the system property

    getProperty

37. public static String getProperty(String key,
38. String def)

39. Gets the System property indicated by the specified key and def.

40. Parameters:
41. key - the name of the system property
42. def - the default value to use if this property is not set

    getenv

43. public static String getenv(String name)

    Gets an environment variable. An environment variable is a system dependent external variable that has a string value.

44. Parameters:
45. name - the name of the environment variable
46. Returns:
47. the value of the variable, or null if the variable is not defined.

    Deprecated. The preferred way to extract system-dependent information is the system properties of the java.lang.System.getProperty methods and the corresponding getTypeName methods of the Boolean, Integer, and Long primitive types. For example:

          String classPath = System.getProperty("java.class.path",".");

    exit

48. public static void exit(int status)

49. Exits the virtual machine with an exit code. This method does not return, use with caution. Not valid in an Applet.

50. Parameters:
51. status - exit status, 0 if successful, other values indicate
52. various error types.

    gc

53. public static void gc()

54. Runs the garbage collector.

    runFinalization

55. public static void runFinalization()

56. Runs the finalization methods of any objects pending finalization.

    load

57. public static void load(String filename)

58. Loads a dynamic library, given a complete path name.

59. Parameters:
60. filename - the file to load
61. Throws: UnsatisfiedLinkError
62. If the file does not exist.

    loadLibrary

63. public static void loadLibrary(String libname)

64. Loads a dynamic library with the specified library name.

65. Parameters:
66. libname - the name of the library
67. Throws: UnsatisfiedLinkError
68. If the library does not exist.

    in

69. public static InputStream in

70. the standard input stream

    out

71. public static InputStream out

72. the standard output stream

    err

73. public static InputStream err

74. the standard error reporting stream

. . . . . . . . . ( end of section Java class System) <<Contents | Index>>