public class Util
extends java.lang.Object
Provides various static utility methods.
Modifier and Type | Field and Description |
---|---|
static long |
EPOCH_DIFF
The 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 and Description |
---|
Util() |
Modifier and Type | Method and Description |
---|---|
static 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 void |
copy(byte[] src,
int srcOffset,
int length,
byte[] dst,
int dstOffset)
Copies a part of a byte array into another byte array.
|
static long |
dateToFileTime(java.util.Date date)
Converts a
Date into a filetime. |
static boolean |
equal(byte[] a,
byte[] b)
Checks whether two byte arrays a and b
are equal.
|
static boolean |
equals(java.util.Collection<?> c1,
java.util.Collection<?> c2)
Checks whether two collections are equal.
|
static boolean |
equals(java.lang.Object[] c1,
java.lang.Object[] c2)
Compares to object arrays with regarding the objects' order.
|
static java.util.Date |
filetimeToDate(int high,
int low)
Converts a Windows FILETIME into a
Date . |
static java.util.Date |
filetimeToDate(long filetime)
Converts a Windows FILETIME into a
Date . |
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[] |
pad4(java.lang.String s)
Pads a string with 0x0000 characters so that its length is a
multiple of 4.
|
static java.lang.String |
toString(java.lang.Throwable t)
Returns a textual representation of a
Throwable , including a
stacktrace. |
public static final long EPOCH_DIFF
The 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? :-))
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].
a
- The first byte arrayb
- The first byte arraytrue
if the byte arrays are equal, else
false
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.
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.public static byte[] cat(byte[][] byteArrays)
Concatenates the contents of several byte arrays into a single one.
byteArrays
- The byte arrays to be concatened.public static byte[] copy(byte[] src, int offset, int length)
Copies bytes from a source byte array into a new byte array.
src
- Copy from this byte array.offset
- Start copying here.length
- Copy this many bytes.public static java.util.Date filetimeToDate(int high, int low)
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.
high
- The higher double word of the FILETIME structure.low
- The lower double word of the FILETIME structure.Date
.public static java.util.Date filetimeToDate(long filetime)
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.
filetime
- The filetime to convert.Date
.public static long dateToFileTime(java.util.Date date)
Converts a Date
into a filetime.
date
- The date to be convertedfiletimeToDate(long)
,
filetimeToDate(int, int)
public static boolean equals(java.util.Collection<?> c1, java.util.Collection<?> c2)
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.
c1
- the first collectionc2
- the second collectiontrue
if the collections are equal, else
false
.public static boolean equals(java.lang.Object[] c1, java.lang.Object[] c2)
Compares to object arrays with regarding the objects' order. For example, [1, 2, 3] and [2, 1, 3] are equal.
c1
- The first object array.c2
- The second object array.true
if the object arrays are equal,
false
if they are not.public static byte[] pad4(byte[] ba)
Pads a byte array with 0x00 bytes so that its length is a multiple of 4.
ba
- The byte array to pad.public static char[] pad4(char[] ca)
Pads a character array with 0x0000 characters so that its length is a multiple of 4.
ca
- The character array to pad.public static char[] pad4(java.lang.String s)
Pads a string with 0x0000 characters so that its length is a multiple of 4.
s
- The string to pad.public static java.lang.String toString(java.lang.Throwable t)
Returns a textual representation of a Throwable
, including a
stacktrace.
t
- The Throwable
t.printStacktrace()
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