JavaUtils (Commons)

java.lang.Object
- com.lf.commons.lang.JavaUtils

```
public final class JavaUtils
extends java.lang.Object
```
This class holds various methods for common use.
All members of this class are declared public, most are static, too. The first static method was getImageFromURL which supports loading an Image object from an image file. Method translateToXMLCDATA supports all forbidden characters for XML elements and attributes now.
For the other methods see the documentation comments below.

Since:

1.5

Version:

$Revision: 1.92 $, $Date: 2016/01/01 15:43:02 $

Author:

Axel Schwolow

Field Summary

Fields
Modifier and Type	Field and Description
`static java.lang.String`	`LINE_SEPARATOR` Provides the linefeed appropriate for the system.
`static java.lang.String`	`PROPERTY_JNLP_BASE_URL` System property holding the deploy URL used for Web Start.
`static java.lang.String`	`PROPERTY_JNLP_DEPLOY_ID` System property holding the current application ID from deploy.properties.
`static java.lang.String`	`PROPERTY_JNLP_LOCALES` System property holding the supported locales for Web Start.
`static java.lang.String`	`PROPERTY_JNLP_RESTART_EXE` System property holding the installer restart executable.
`static java.lang.String`	`PROPERTY_JNLP_RESTART_URL` System property holding the Java restart URL used for Web Start.

Constructor Summary

Constructors
Constructor and Description

JavaUtils()
Constructor method for i18n purposes only.

Constructors
Constructor and Description
`JavaUtils()` Constructor method for i18n purposes only.

Method Summary

Methods
Modifier and Type	Method and Description
`static java.lang.Object`	`addToArray(java.lang.Object array, java.lang.Object newval)` Adds another element to the given array (saves `System.arraycopy()` calls).
`static boolean`	`arrayEquals(java.lang.Object array1, java.lang.Object array2)` Compares two arrays field by field since Java lacks `equals()` for arrays.
`static boolean`	`arrayEqualsNull(java.lang.Object array1, java.lang.Object array2)` Compares two arrays field by field since Java lacks `equals()` for arrays.
`static void`	`browse(java.lang.String uri)` Let's the system browse the given uniform resource identifier like an URL.
`static boolean`	`canRestart()` Can the running application be restarted programmtically?
`static java.io.File`	`changeInstallerMaxMem(int maxmem)` Tries to change the maximum amount of memory in the installer specific deployment file.
`static boolean`	`checkJavaVersion(java.lang.String regex)` Checks if the current Java version is OK for the given version pattern.
`static <T> T[]`	`convertToArray(java.util.Vector<T> container, T[] array)` Converts the given `Vector` to an array representation.
`static byte[]`	`convertToBytes(java.lang.String hexdata)` Converts a hexadecimal value to the corresponding raw bytes array.
`static java.lang.String`	`convertToHex(byte[] rawdata, boolean uppercase)` Converts binary data to a sequence of hex digits of full length (leading/trailing zeroes).
`static java.lang.String`	`convertToHex(byte[] rawdata, boolean uppercase, boolean spaces)` Converts binary data to a sequence of hex digits of full length (leading/trailing zeroes).
`static java.lang.String`	`convertToHex(byte b, boolean uppercase)` Converts a single byte to hex representation.
`static <T> java.util.Vector<T>`	`convertToVector(T[] array)` Converts the given array to a `Vector` representation.
`static boolean`	`elementOf(java.lang.Object object, java.lang.Object array)` Checks if the given object is element of the given array (equals).
`static boolean`	`equalsNull(java.lang.Object obj1, java.lang.Object obj2)` Convenience method to compare objects using `equals()` which may be `null`.
`static java.lang.Object`	`findKey(java.util.Hashtable container, java.lang.Object value)` Searches the given container and provides the key for the given value object.
`static java.lang.String`	`formatNumber(long number)` Formats a long number for the current locale setting.
`static java.lang.String`	`generateShort(long value)` Generates the short forms of long numbers like '99 MB'.
`static java.lang.String`	`generateShort(long value, java.lang.String pattern)` Generates the short forms of long numbers like '99 MB'.
`static java.lang.String`	`generateShort(long value, java.lang.String pattern, java.util.Locale locale)` Generates the short forms of long numbers like '99.9 MB'.
`static java.lang.String`	`generateShortBytes(long value, java.lang.String pattern, java.util.Locale locale)` Generates the short forms of long numbers like '123456789' (bytes) without unit identifier.
`static java.lang.String`	`generateShortGB(long value, java.lang.String pattern, java.util.Locale locale)` Generates the short forms of long numbers like '12345.3' (mega bytes) without unit identifier.
`static java.lang.String`	`generateShortKB(long value)` Generates the short forms of long numbers like '99 KB' (kilo bytes only).
`static java.lang.String`	`generateShortKB(long value, java.lang.String pattern, java.util.Locale locale)` Generates the short forms of long numbers like '12345.3' (kilo bytes) without unit identifier.
`static java.lang.String`	`generateShortMB(long value, java.lang.String pattern, java.util.Locale locale)` Generates the short forms of long numbers like '12345.3' (mega bytes) without unit identifier.
`static java.lang.String`	`generateShortTB(long value, java.lang.String pattern, java.util.Locale locale)` Generates the short forms of long numbers like '12345.3' (tera bytes) without unit identifier.
`static java.lang.String`	`getMethod(boolean full)` Detemrines the name of the current method from the stack trace.
`static java.lang.String`	`getUserHome()` Determines the user's home directory either from system or InstallAnywhere.
`static java.util.Vector<Locale>`	`getWebStartLocales()` Scans for the <`locales` system property added optionally by Web Start.
`static int`	`indexOf(java.lang.Object object, java.lang.Object array)` Determines the index of the given element in the array.
`static boolean`	`isDevelopment()` Is the application currently being executed in a development environment?
`static boolean`	`isInstalled()` Has the application been installed with an installer?
`static boolean`	`isInteger(java.lang.String value)` Determines whether the given parameter is an integer value or not.
`static boolean`	`isLinux()` Is the VM running on a Linux operating system?
`static boolean`	`isLong(java.lang.String value)` Determines whether the given parameter is a `Long` value or not.
`static boolean`	`isMacOSX()` Is the VM running on an Apple Mac OS X operating system?
`static boolean`	`isMethodCalled(java.lang.Class clazz)` Determines whether the given method call is part of the stack trace.
`static boolean`	`isMethodCalled(java.lang.Class clazz, java.lang.String method)` Determines whether the given method call is part of the stack trace.
`static boolean`	`isSolaris()` Is the VM running on a Solaris operating system?
`static boolean`	`isWebStart()` Is the application running with Java Web Start?
`static boolean`	`isWindows()` Is the VM running on a Microsoft Windows operating system?
`static java.lang.Class`	`mapToPrimitive(java.lang.Class clazz)` Provides the associated primitive type (`Integer` -> `int`).
`static java.lang.Object`	`minimizeArray(java.lang.Object array)` Creates an array where the `null` elements of the given array are eliminated.
`static <T> void`	`moveDown(java.util.Vector<T> container, T element)` Convenience method to move down an element within a container.
`static <T> void`	`moveUp(java.util.Vector<T> container, T element)` Convenience method to move up an element within a container.
`static java.lang.String`	`nextIdentifier(java.lang.String item, java.util.Hashtable itemset)` Determines the next item string for a set of strings.
`static long`	`parseTotalBytes(java.lang.String raw)` Parses byte size abbreviations like "10M" and returns the number of bytes.
`static java.lang.Object`	`prependToArray(java.lang.Object array, java.lang.Object newval)` Prepends another element to the given array (saves `System.arraycopy()` calls).
`static java.lang.String`	`printStackTrace(java.lang.Exception exc, java.lang.String encoding)` Prints the stack trace of the given exception as text instead of `System.out`.
`static void`	`restartInstaller()` Tries to restart the running application programmatically.
`static void`	`restartJNLP(java.io.File tempjnlp, java.lang.String restartURL)` Tries to restart the running application programmatically.
`static void`	`runWebStart(java.lang.String params)` Tries to start the Java Control Panel application from the current path.
`static java.lang.Object`	`subarray(java.lang.Object array, int beginindex, int endindex)` Creates a subarray.
`static void`	`uninstallInstaller(java.lang.String regex)` Tries to uninstall the running application programmatically.
`static boolean`	`vectorEquals(java.util.Vector v1, java.util.Vector v2)` Compares two containers element by element.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - LINE_SEPARATOR
```
public static final java.lang.String LINE_SEPARATOR
```
    Provides the linefeed appropriate for the system.
  - PROPERTY_JNLP_RESTART_URL
```
public static final java.lang.String PROPERTY_JNLP_RESTART_URL
```
    System property holding the Java restart URL used for Web Start.
    
    See Also:
    Constant Field Values
  - PROPERTY_JNLP_LOCALES
```
public static final java.lang.String PROPERTY_JNLP_LOCALES
```
    System property holding the supported locales for Web Start.
    
    See Also:
    Constant Field Values
  - PROPERTY_JNLP_BASE_URL
```
public static final java.lang.String PROPERTY_JNLP_BASE_URL
```
    System property holding the deploy URL used for Web Start.
    
    See Also:
    Constant Field Values
  - PROPERTY_JNLP_DEPLOY_ID
```
public static final java.lang.String PROPERTY_JNLP_DEPLOY_ID
```
    System property holding the current application ID from deploy.properties.
    
    See Also:
    Constant Field Values
  - PROPERTY_JNLP_RESTART_EXE
```
public static final java.lang.String PROPERTY_JNLP_RESTART_EXE
```
    System property holding the installer restart executable.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - JavaUtils
```
public JavaUtils()
          throws java.lang.InstantiationException
```
    Constructor method for i18n purposes only.
    Can only be used if beans design time is set (e.g. by external tools like the I18NExtractor).
    
    Throws:
    
    java.lang.InstantiationException - Error indication
    Since:
    
    1.6
- Method Detail
  - nextIdentifier
```
public static java.lang.String nextIdentifier(java.lang.String item,
                              java.util.Hashtable itemset)
```
    Determines the next item string for a set of strings.
    Then we determine the next valid name. As common in many programs we simply append a number in brackets. If we have "Module" then we generate "Module (2)", then "Module (3)" and so on. We always use the next free index for the string within the set.
    
    Parameters:
    item - The string which shall be modified
    itemset - Set of existing strings as keys in Hashtable
    
    Returns:
    Next unique identifier, null if something went wrong
    Since:
    
    1.5
  - generateShort
```
public static java.lang.String generateShort(long value)
```
    Generates the short forms of long numbers like '99 MB'.
    The method generates short forms for Kilo bytes (KB), Mega bytes (MB) and Giga bytes (GB). This may be used for instance by memory monitors of JVMs.
    
    Parameters:
    value - Numeric value to be shortened
    
    Returns:
    The result string or null if error occurs
    Since:
    
    1.5
  - generateShort
```
public static java.lang.String generateShort(long value,
                             java.lang.String pattern)
```
    Generates the short forms of long numbers like '99 MB'.
    The method generates short forms for Kilo bytes (KB), Mega bytes (MB) and Giga bytes (GB). This may be used for instance by memory monitors of JVMs.
    
    Parameters:
    value - Numeric value to be shortened
    pattern - DecimalFormat pattern like '#.##'
    
    Returns:
    The result string or null if error occurs
    Since:
    
    1.6
  - generateShort
```
public static java.lang.String generateShort(long value,
                             java.lang.String pattern,
                             java.util.Locale locale)
```
    Generates the short forms of long numbers like '99.9 MB'.
    The method generates short forms for Kilo bytes (KB), Mega bytes (MB), Giga bytes (GB), and Tera bytes (TB). This may be used for instance by memory monitors of JVMs.
    
    Parameters:
    value - Numeric value to be shortened
    pattern - DecimalFormat pattern like '#.##'
    locale - The locale
    
    Returns:
    The result string or null if error occurs
    
    Throws:
    
    java.lang.NullPointerException - If parameters are null
    
    java.lang.IllegalArgumentException - If pattern is invalid
    Since:
    
    1.6
  - generateShortKB
```
public static java.lang.String generateShortKB(long value)
```
    Generates the short forms of long numbers like '99 KB' (kilo bytes only).
    
    Parameters:
    value - Numeric value to be shortened
    
    Returns:
    The result string or null if error occurs
    Since:
    
    1.5
  - generateShortBytes
```
public static java.lang.String generateShortBytes(long value,
                                  java.lang.String pattern,
                                  java.util.Locale locale)
```
    Generates the short forms of long numbers like '123456789' (bytes) without unit identifier.
    
    Parameters:
    value - Numeric value to be shortened
    pattern - DecimalFormat pattern like '#.##'
    locale - The locale
    
    Returns:
    The result string
    
    Throws:
    
    java.lang.NullPointerException - If parameters are null
    
    java.lang.IllegalArgumentException - If pattern is invalid
    Since:
    
    1.6
  - generateShortKB
```
public static java.lang.String generateShortKB(long value,
                               java.lang.String pattern,
                               java.util.Locale locale)
```
    Generates the short forms of long numbers like '12345.3' (kilo bytes) without unit identifier.
    
    Parameters:
    value - Numeric value to be shortened
    pattern - DecimalFormat pattern like '#.##'
    locale - The locale
    
    Returns:
    The result string
    
    Throws:
    
    java.lang.NullPointerException - If parameters are null
    
    java.lang.IllegalArgumentException - If pattern is invalid
    Since:
    
    1.6
  - generateShortMB
```
public static java.lang.String generateShortMB(long value,
                               java.lang.String pattern,
                               java.util.Locale locale)
```
    Generates the short forms of long numbers like '12345.3' (mega bytes) without unit identifier.
    
    Parameters:
    value - Numeric value to be shortened
    pattern - DecimalFormat pattern like '#.##'
    locale - The locale
    
    Returns:
    The result string
    
    Throws:
    
    java.lang.NullPointerException - If parameters are null
    
    java.lang.IllegalArgumentException - If pattern is invalid
    Since:
    
    1.6
  - generateShortGB
```
public static java.lang.String generateShortGB(long value,
                               java.lang.String pattern,
                               java.util.Locale locale)
```
    Generates the short forms of long numbers like '12345.3' (mega bytes) without unit identifier.
    
    Parameters:
    value - Numeric value to be shortened
    pattern - DecimalFormat pattern like '#.##'
    locale - The locale
    
    Returns:
    The result string
    
    Throws:
    
    java.lang.NullPointerException - If parameters are null
    
    java.lang.IllegalArgumentException - If pattern is invalid
    Since:
    
    1.6
  - generateShortTB
```
public static java.lang.String generateShortTB(long value,
                               java.lang.String pattern,
                               java.util.Locale locale)
```
    Generates the short forms of long numbers like '12345.3' (tera bytes) without unit identifier.
    
    Parameters:
    value - Numeric value to be shortened
    pattern - DecimalFormat pattern like '#.##'
    locale - The locale
    
    Returns:
    The result string
    
    Throws:
    
    java.lang.NullPointerException - If parameters are null
    
    java.lang.IllegalArgumentException - If pattern is invalid
    Since:
    
    1.6
  - getUserHome
```
public static java.lang.String getUserHome()
```
    Determines the user's home directory either from system or InstallAnywhere.
    This method is a wrapper for handling user home directories dynamically. If a software was installed by InstallAnywhere from ZeroG the LAX property lax.root.install.dir is used while user.home is used if InstallAnywhere is absent.
    
    Returns:
    The user's home directory
    Since:
    
    1.5
    
    See Also:
    System
  - arrayEquals
```
public static boolean arrayEquals(java.lang.Object array1,
                  java.lang.Object array2)
```
    Compares two arrays field by field since Java lacks equals() for arrays.
    Returns true only if the given arrays are exactly of the same type and dimensions and additionally hold the same field contents (equals).
    
    Parameters:
    array1 - The first array to be compared
    array2 - The second array to be compared
    
    Returns:
    Are the arrays equal on a field basis?
    
    Throws:
    
    java.lang.NullPointerException - If array1 and/or array2 is null
    Since:
    
    1.5
  - arrayEqualsNull
```
public static boolean arrayEqualsNull(java.lang.Object array1,
                      java.lang.Object array2)
```
    Compares two arrays field by field since Java lacks equals() for arrays.
    Returns true only if all the objects are equal or both null.
    
    Parameters:
    array1 - The first array to be compared
    array2 - The second array to be compared
    
    Returns:
    Are the arrays equal on a field basis?
    
    Throws:
    
    java.lang.NullPointerException - If array1 and/or array2 is null
    Since:
    
    1.5
  - addToArray
```
public static java.lang.Object addToArray(java.lang.Object array,
                          java.lang.Object newval)
```
    Adds another element to the given array (saves System.arraycopy() calls).
    
    Parameters:
    array - Target array of arbitrary type
    newval - Element to add, may be null
    
    Returns:
    Expanded array
    
    Throws:
    
    java.lang.IllegalArgumentException - Parameters are invalid
  - prependToArray
```
public static java.lang.Object prependToArray(java.lang.Object array,
                              java.lang.Object newval)
```
    Prepends another element to the given array (saves System.arraycopy() calls).
    
    Parameters:
    array - Target array of arbitrary type
    newval - Element to add, may be null
    
    Returns:
    Expanded array
    
    Throws:
    
    java.lang.IllegalArgumentException - Parameters are invalid
    Since:
    
    1.6
  - elementOf
```
public static boolean elementOf(java.lang.Object object,
                java.lang.Object array)
```
    Checks if the given object is element of the given array (equals).
    
    Parameters:
    object - The object to be checked
    array - The array to check against
    
    Returns:
    Is the object element of the array?
    
    Throws:
    
    java.lang.NullPointerException - If object and/or array is null
    Since:
    
    1.6
  - mapToPrimitive
```
public static java.lang.Class mapToPrimitive(java.lang.Class clazz)
```
    Provides the associated primitive type (Integer -> int).
    The types boolean, byte, char, short, int, long, float, double, and void are supported.
    
    Parameters:
    clazz - Class to be mapped
    
    Returns:
    Primitive type or value of clazz if not available
  - getMethod
```
public static java.lang.String getMethod(boolean full)
```
    Detemrines the name of the current method from the stack trace.
    
    Parameters:
    full - Print full class info?
    
    Returns:
    Currently executed method
  - isWindows
```
public static boolean isWindows()
```
    Is the VM running on a Microsoft Windows operating system?
    
    Returns:
    Windows OS?
  - isMacOSX
```
public static boolean isMacOSX()
```
    Is the VM running on an Apple Mac OS X operating system?
    
    Returns:
    Mac OS X?
    Since:
    
    1.6
  - isLinux
```
public static boolean isLinux()
```
    Is the VM running on a Linux operating system?
    
    Returns:
    Linux?
    Since:
    
    1.6
  - isSolaris
```
public static boolean isSolaris()
```
    Is the VM running on a Solaris operating system?
    
    Returns:
    Solaris?
    Since:
    
    1.6
  - isWebStart
```
public static boolean isWebStart()
```
    Is the application running with Java Web Start?
    
    Returns:
    Web Start deploy?
  - isInstalled
```
public static boolean isInstalled()
```
    Has the application been installed with an installer?
    
    Returns:
    Installed deploy?
  - isDevelopment
```
public static boolean isDevelopment()
```
    Is the application currently being executed in a development environment?
    This is the case if it is not installed and has not been started from Web Start.
    
    Returns:
    Development environment?
  - convertToHex
```
public static java.lang.String convertToHex(byte b,
                            boolean uppercase)
```
    Converts a single byte to hex representation.
    
    Parameters:
    b - Data to be converted
    uppercase - Use uppercase hex characters, lowercase if false
    
    Returns:
    Calculated hex representation
  - convertToHex
```
public static java.lang.String convertToHex(byte[] rawdata,
                            boolean uppercase)
```
    Converts binary data to a sequence of hex digits of full length (leading/trailing zeroes).
    
    Parameters:
    rawdata - The binary data to be transformed
    uppercase - Use uppercase hex characters, lowercase if false
    
    Returns:
    The hexadecimal representation
    Since:
    
    1.5
  - convertToHex
```
public static java.lang.String convertToHex(byte[] rawdata,
                            boolean uppercase,
                            boolean spaces)
```
    Converts binary data to a sequence of hex digits of full length (leading/trailing zeroes).
    
    Parameters:
    rawdata - The binary data to be transformed
    uppercase - Use uppercase hex characters, lowercase if false
    spaces - Insert SPACEs between hex values
    
    Returns:
    The hexadecimal representation
    Since:
    
    1.6
  - convertToBytes
```
public static byte[] convertToBytes(java.lang.String hexdata)
```
    Converts a hexadecimal value to the corresponding raw bytes array.
    Found the solution here: http://www.java2s.com/Code/Java/Development-Class/ConverthexToBytes.htm
    
    Parameters:
    hexdata - The hexadecimal data to be transformed
    
    Returns:
    The byte representation or null if hex value is invalid
    
    Throws:
    
    java.lang.NullPointerException - If parameter is invalid
    Since:
    
    1.6
  - parseTotalBytes
```
public static long parseTotalBytes(java.lang.String raw)
```
    Parses byte size abbreviations like "10M" and returns the number of bytes.
    Currently the scales (K)ilobytes, (M)egabytes, (G)igabytes, and (T)erabytes are supported. Of course straight byte values can also be parsed. The string must apply to the regular expression "([ ]*[0-9]+[ ]*[KMGT][ ]*)".
    
    Parameters:
    raw - String like "10M" to be parsed
    
    Returns:
    The total byte count
    
    Throws:
    
    java.lang.NullPointerException - If parameter is null
    
    java.lang.IllegalArgumentException - If parameter does not apply to regex
    Since:
    
    1.5
  - canRestart
```
public static boolean canRestart()
```
    Can the running application be restarted programmtically?
    Depends on the kind the application was started. If started via Web Start from a Leisenfels server using the default JNLP/JSP files then a special system propertiy is set to allow the application to restart. Some installers may support restarting as well by any mechanism.
    Web Start applications add the "lf.restart.url" system property holding the restart URL like "http://devel.al11.net/digester-1.6.x/install.jnlp?logconsole&logpipe&locale=ger_DE". This can be executed by the system to relaunch the application.
    
    Returns:
    Can the application be restarted?
  - restartJNLP
```
public static void restartJNLP(java.io.File tempjnlp,
               java.lang.String restartURL)
```
    Tries to restart the running application programmatically.
    The method downloads the JNLP file from the given URL and sves the contents into the given local file. This file is then opened with the javaws executable if available.
    
    Parameters:
    tempjnlp - The temporary file for the JNLP download
    restartURL - Restart with this URL (e.g. Web Start), may be null
  - restartInstaller
```
public static void restartInstaller()
```
    Tries to restart the running application programmatically.
    The installer executable is called from the current working directory.
  - formatNumber
```
public static java.lang.String formatNumber(long number)
```
    Formats a long number for the current locale setting.
    
    Parameters:
    number - The number to be formatted
    
    Returns:
    The formatted number
    Since:
    
    1.6
  - getWebStartLocales
```
public static java.util.Vector<Locale> getWebStartLocales()
```
    Scans for the <locales system property added optionally by Web Start.
    
    Returns:
    Container with Web Start locales for the program, null if not set
    Since:
    
    1.6
  - isMethodCalled
```
public static boolean isMethodCalled(java.lang.Class clazz,
                     java.lang.String method)
```
    Determines whether the given method call is part of the stack trace.
    Caution: May not work for obfuscated applications since the method name changes! Use the other isMethodCalled() method without method parameter then (class check only).
    
    Parameters:
    clazz - Class reference for search
    method - Method name for the search
    
    Returns:
    Method has been called?
  - isMethodCalled
```
public static boolean isMethodCalled(java.lang.Class clazz)
```
    Determines whether the given method call is part of the stack trace.
    
    Parameters:
    clazz - Class reference for search
    
    Returns:
    Method has been called?
  - changeInstallerMaxMem
```
public static java.io.File changeInstallerMaxMem(int maxmem)
```
    Tries to change the maximum amount of memory in the installer specific deployment file.
    
    Parameters:
    maxmem - Memory size in megabytes
    
    Returns:
    The vmoptions file if an error occurs, null = success
  - runWebStart
```
public static void runWebStart(java.lang.String params)
```
    Tries to start the Java Control Panel application from the current path.
    
    Parameters:
    params - Parameters for the javaws executable (optional)
  - isInteger
```
public static boolean isInteger(java.lang.String value)
```
    Determines whether the given parameter is an integer value or not.
    
    Parameters:
    value - Value to be parsed
    
    Returns:
    Is integer?
  - isLong
```
public static boolean isLong(java.lang.String value)
```
    Determines whether the given parameter is a Long value or not.
    
    Parameters:
    value - Value to be parsed
    
    Returns:
    Is integer?
  - browse
```
public static void browse(java.lang.String uri)
```
    Let's the system browse the given uniform resource identifier like an URL.
    Use this method to open not only HTTP addresses but also application help system links in the notation like "javahelp://digester?mapid=infos.intro". Then the help delegate is called.
    
    Parameters:
    uri - Uniform resource identifier
  - findKey
```
public static java.lang.Object findKey(java.util.Hashtable container,
                       java.lang.Object value)
```
    Searches the given container and provides the key for the given value object.
    
    Parameters:
    container - The container
    value - Value to be searched
    
    Returns:
    Key for the value, may be null
  - equalsNull
```
public static boolean equalsNull(java.lang.Object obj1,
                 java.lang.Object obj2)
```
    Convenience method to compare objects using equals() which may be null.
    Returns true only if the objects are equal or both null.
    
    Parameters:
    obj1 - First object to be compared
    obj2 - Second object to be compared
    
    Returns:
    Are the objects equal?
  - moveUp
```
public static <T> void moveUp(java.util.Vector<T> container,
              T element)
```
    Convenience method to move up an element within a container.
    
    Parameters:
    container - The container
    element - The element to be moved
    
    Throws:
    
    java.lang.NullPointerException - If a parameter is null
  - moveDown
```
public static <T> void moveDown(java.util.Vector<T> container,
                T element)
```
    Convenience method to move down an element within a container.
    
    Parameters:
    container - The container
    element - The element to be moved
    
    Throws:
    
    java.lang.NullPointerException - If a parameter is null
  - minimizeArray
```
public static java.lang.Object minimizeArray(java.lang.Object array)
```
    Creates an array where the null elements of the given array are eliminated.
    
    Parameters:
    array - Target array of arbitrary type
    
    Returns:
    Minimized array
    
    Throws:
    
    java.lang.IllegalArgumentException - Parameters are invalid
    Since:
    
    1.6
  - convertToArray
```
public static <T> T[] convertToArray(java.util.Vector<T> container,
                     T[] array)
```
    Converts the given Vector to an array representation.
    There's currently no way to create generic arrays so it must be passed here.
    
    Parameters:
    container - The vector to be converted
    array - The array to be filled, same length as vector
    
    Returns:
    The array
    
    Throws:
    
    java.lang.NullPointerException - If a parameter is null
    
    java.lang.IndexOutOfBoundsException - If the container has not the same size than the array
    Since:
    
    1.6
  - convertToVector
```
public static <T> java.util.Vector<T> convertToVector(T[] array)
```
    Converts the given array to a Vector representation.
    
    Parameters:
    array - The array to be converted
    
    Returns:
    The vector
    
    Throws:
    
    java.lang.NullPointerException - If a parameter is null
    Since:
    
    1.6
  - checkJavaVersion
```
public static boolean checkJavaVersion(java.lang.String regex)
```
    Checks if the current Java version is OK for the given version pattern.
    The Leisenfels applications are normally nailed to a fixed Java version which allows us for selling new licenses when new OSs/JVMs are published.
    
    Parameters:
    regex - The version pattern like "(^1[\.]6$)"
    
    Returns:
    Current Java version OK?
    Since:
    
    1.6
  - printStackTrace
```
public static java.lang.String printStackTrace(java.lang.Exception exc,
                               java.lang.String encoding)
```
    Prints the stack trace of the given exception as text instead of System.out.
    
    Parameters:
    exc - The exception to print
    encoding - The charset like "UTF-8"
    
    Returns:
    The stack trace, null indicates error
    Since:
    
    1.6
  - indexOf
```
public static int indexOf(java.lang.Object object,
          java.lang.Object array)
```
    Determines the index of the given element in the array.
    
    Parameters:
    object - The object to be checked
    array - The array to check against
    
    Returns:
    Index, -1 otherwise
    
    Throws:
    
    java.lang.NullPointerException - If object and/or array is null
    Since:
    
    1.6
  - subarray
```
public static java.lang.Object subarray(java.lang.Object array,
                        int beginindex,
                        int endindex)
```
    Creates a subarray.
    
    Parameters:
    array - Target array of arbitrary type
    beginindex - The first index to copy
    endindex - The end index, copied to endindex-1
    
    Returns:
    Expanded array
    
    Throws:
    
    java.lang.IllegalArgumentException - Parameters are invalid
    Since:
    
    1.6
  - vectorEquals
```
public static boolean vectorEquals(java.util.Vector v1,
                   java.util.Vector v2)
```
    Compares two containers element by element.
    Returns true only if the given containers are exactly of the same type and size and additionally hold the same elements (equals).
    
    Parameters:
    v1 - The first container to be compared
    v2 - The second container to be compared
    
    Returns:
    Are the containers equal on an element basis?
    
    Throws:
    
    java.lang.NullPointerException - If v1 and/or v2 is null
    Since:
    
    1.6
  - uninstallInstaller
```
public static void uninstallInstaller(java.lang.String regex)
```
    Tries to uninstall the running application programmatically.
    The uninstaller executable is called from the current working directory.
    
    Parameters:
    regex - The regex to detect the uninstaller executable

Class JavaUtils

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LINE_SEPARATOR

PROPERTY_JNLP_RESTART_URL

PROPERTY_JNLP_LOCALES

PROPERTY_JNLP_BASE_URL

PROPERTY_JNLP_DEPLOY_ID

PROPERTY_JNLP_RESTART_EXE

Constructor Detail

JavaUtils

Method Detail

nextIdentifier

generateShort

generateShort

generateShort

generateShortKB

generateShortBytes

generateShortKB

generateShortMB

generateShortGB

generateShortTB

getUserHome

arrayEquals

arrayEqualsNull

addToArray

prependToArray

elementOf

mapToPrimitive

getMethod

isWindows

isMacOSX

isLinux

isSolaris

isWebStart

isInstalled

isDevelopment

convertToHex

convertToHex

convertToHex

convertToBytes

parseTotalBytes

canRestart

restartJNLP

restartInstaller

formatNumber

getWebStartLocales

isMethodCalled

isMethodCalled

changeInstallerMaxMem

runWebStart

isInteger

isLong

browse

findKey

equalsNull

moveUp

moveDown

minimizeArray

convertToArray

convertToVector

checkJavaVersion

printStackTrace

indexOf

subarray

vectorEquals

uninstallInstaller