org.openeuler.util

类 Util

java.lang.Object

org.openeuler.util.Util

public class Util
extends Object

构造器概要

构造器

构造器和说明
Util()

方法概要

限定符和类型	方法和说明
static byte[]	asUnsignedByteArray(int length, BigInteger value) Return the passed in value as an unsigned byte array of the specified length, padded with leading zeros as necessary..
static int	bigEndianToInt(byte[] bs, int off)
static byte[]	concatenate(byte[] a, byte[] b) Concatenate byte arrays a and b
static byte[]	concatenate(byte[] a, byte[] b, byte[] c) Concatenate byte arrays a, b and c
private static byte[]	createRandom(int bitLen, SecureRandom random) Create a large integer of a specific bit length
static BigInteger	createRandomBigInteger(int bitLen, SecureRandom random) Create a large integer of a specific bit length
static void	intToBigEndian(int[] ns, byte[] bs, int off) convert the numbers to big endian
static void	intToBigEndian(int n, byte[] bs, int off) convert the number to big endian
static int	rotateShiftLeft(int x, int k) 32-bit cyclic shift left by k bits
static String	toUpperCase(String string) A locale independent version of toUpperCase.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

Util

public Util()

方法详细资料

rotateShiftLeft

public static int rotateShiftLeft(int x,
                                  int k)

32-bit cyclic shift left by k bits

参数:

x - 32-bit number

k - The number of bits that need to be rotated left

返回:

(x << k) | (x >>> (32 - k))

intToBigEndian

public static void intToBigEndian(int[] ns,
                                  byte[] bs,
                                  int off)

convert the numbers to big endian

参数:

ns - list of numbers

bs - Byte array to store converted numbers

off - start position of bit array

intToBigEndian

public static void intToBigEndian(int n,
                                  byte[] bs,
                                  int off)

convert the number to big endian

参数:

n - number

bs - Byte array to store converted numbers

off - start position of bit array

bigEndianToInt

public static int bigEndianToInt(byte[] bs,
                                 int off)

createRandomBigInteger

public static BigInteger createRandomBigInteger(int bitLen,
                                                SecureRandom random)

Create a large integer of a specific bit length

参数:

bitLen -

random -

返回:

A Biginteger with a bit length of bitLen

createRandom

private static byte[] createRandom(int bitLen,
                                   SecureRandom random)
                            throws IllegalArgumentException

Create a large integer of a specific bit length

参数:

bitLen -

random -

返回:

A byte array of a Biginteger with a bit length of bitLen

抛出:

IllegalArgumentException

asUnsignedByteArray

public static byte[] asUnsignedByteArray(int length,
                                         BigInteger value)

Return the passed in value as an unsigned byte array of the specified length, padded with leading zeros as necessary..

参数:

length - the fixed length of the result

value - the value to be converted.

返回:

a byte array padded to a fixed length with leading zeros.

concatenate

public static byte[] concatenate(byte[] a,
                                 byte[] b)

Concatenate byte arrays a and b

参数:

a -

b -

返回:

the resulting array after concatenating the input arrays

concatenate

public static byte[] concatenate(byte[] a,
                                 byte[] b,
                                 byte[] c)

Concatenate byte arrays a, b and c

参数:

a -

b -

c -

返回:

the resulting array after concatenating the input arrays

toUpperCase

public static String toUpperCase(String string)

A locale independent version of toUpperCase.

参数:

string - input to be converted

返回:

a US Ascii uppercase version