Class Util
Provides various static utility methods.
- Since:
- 2002-02-09
- Version:
- $Id: Util.java 550886 2007-06-26 17:58:28Z klute $
- Author:
- Rainer Klute (klute@rainer-klute.de)
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final longThe difference between the Windows epoch (1601-01-01 00:00:00) and the Unix epoch (1970-01-01 00:00:00) in milliseconds: 11644473600000L. -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic byte[]cat(byte[][] byteArrays) Concatenates the contents of several byte arrays into a single one.static byte[]copy(byte[] src, int offset, int length) Copies bytes from a source byte array into a new byte array.static voidcopy(byte[] src, int srcOffset, int length, byte[] dst, int dstOffset) Copies a part of a byte array into another byte array.static longdateToFileTime(Date date) Converts aDateinto a filetime.static booleanequal(byte[] a, byte[] b) Checks whether two byte arrays a and b are equal.static booleanCompares to object arrays with regarding the objects' order.static booleanequals(Collection c1, Collection c2) Checks whether two collections are equal.static DatefiletimeToDate(int high, int low) Converts a Windows FILETIME into aDate.static DatefiletimeToDate(long filetime) Converts a Windows FILETIME into aDate.static byte[]pad4(byte[] ba) Pads a byte array with 0x00 bytes so that its length is a multiple of 4.static char[]pad4(char[] ca) Pads a character array with 0x0000 characters so that its length is a multiple of 4.static char[]Pads a string with 0x0000 characters so that its length is a multiple of 4.static StringReturns a textual representation of aThrowable, including a stacktrace.
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Field Details
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EPOCH_DIFF
public static final long EPOCH_DIFFThe difference between the Windows epoch (1601-01-01 00:00:00) and the Unix epoch (1970-01-01 00:00:00) in milliseconds: 11644473600000L. (Use your favorite spreadsheet program to verify the correctness of this value. By the way, did you notice that you can tell from the epochs which operating system is the modern one? :-))
- See Also:
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Constructor Details
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Util
public Util()
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Method Details
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equal
public static boolean equal(byte[] a, byte[] b) Checks whether two byte arrays a and b are equal. They are equal
if they have the same length and
if for each i with i >= 0 and i < a.length holds a[i] == b[i].
- Parameters:
a- The first byte arrayb- The first byte array- Returns:
trueif the byte arrays are equal, elsefalse
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copy
public static void copy(byte[] src, int srcOffset, int length, byte[] dst, int dstOffset) Copies a part of a byte array into another byte array.
- Parameters:
src- The source byte array.srcOffset- Offset in the source byte array.length- The number of bytes to copy.dst- The destination byte array.dstOffset- Offset in the destination byte array.
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cat
public static byte[] cat(byte[][] byteArrays) Concatenates the contents of several byte arrays into a single one.
- Parameters:
byteArrays- The byte arrays to be concatened.- Returns:
- A new byte array containing the concatenated byte arrays.
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copy
public static byte[] copy(byte[] src, int offset, int length) Copies bytes from a source byte array into a new byte array.
- Parameters:
src- Copy from this byte array.offset- Start copying here.length- Copy this many bytes.- Returns:
- The new byte array. Its length is number of copied bytes.
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filetimeToDate
Converts a Windows FILETIME into a
Date. The Windows FILETIME structure holds a date and time associated with a file. The structure identifies a 64-bit integer specifying the number of 100-nanosecond intervals which have passed since January 1, 1601. This 64-bit value is split into the two double words stored in the structure.- Parameters:
high- The higher double word of the FILETIME structure.low- The lower double word of the FILETIME structure.- Returns:
- The Windows FILETIME as a
Date.
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filetimeToDate
Converts a Windows FILETIME into a
Date. The Windows FILETIME structure holds a date and time associated with a file. The structure identifies a 64-bit integer specifying the number of 100-nanosecond intervals which have passed since January 1, 1601.- Parameters:
filetime- The filetime to convert.- Returns:
- The Windows FILETIME as a
Date.
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dateToFileTime
Converts a
Dateinto a filetime.- Parameters:
date- The date to be converted- Returns:
- The filetime
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equals
Checks whether two collections are equal. Two collections C1 and C2 are equal, if the following conditions are true:
For each c1i (element of C1) there is a c2j (element of C2), and c1i equals c2j.
For each c2i (element of C2) there is a c1j (element of C1) and c2i equals c1j.
- Parameters:
c1- the first collectionc2- the second collection- Returns:
trueif the collections are equal, elsefalse.
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equals
Compares to object arrays with regarding the objects' order. For example, [1, 2, 3] and [2, 1, 3] are equal.
- Parameters:
c1- The first object array.c2- The second object array.- Returns:
trueif the object arrays are equal,falseif they are not.
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pad4
public static byte[] pad4(byte[] ba) Pads a byte array with 0x00 bytes so that its length is a multiple of 4.
- Parameters:
ba- The byte array to pad.- Returns:
- The padded byte array.
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pad4
public static char[] pad4(char[] ca) Pads a character array with 0x0000 characters so that its length is a multiple of 4.
- Parameters:
ca- The character array to pad.- Returns:
- The padded character array.
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pad4
Pads a string with 0x0000 characters so that its length is a multiple of 4.
- Parameters:
s- The string to pad.- Returns:
- The padded string as a character array.
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toString
Returns a textual representation of a
Throwable, including a stacktrace.- Parameters:
t- TheThrowable- Returns:
- a string containing the output of a call to
t.printStacktrace().
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