Objects (The ZKoss Common Library 9.5.1.2 API)

java.lang.Object
- org.zkoss.lang.Objects

```
public class Objects
extends Object
```
Utilities related to the Object class.

Author:

tomyeh

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`BAR0_STRING` Deprecated. As of release 6.0.0, not worth to have this API.
`static String`	`BAR1_STRING` Deprecated. As of release 6.0.0, not worth to have this API.
`static String`	`BAR2_STRING` Deprecated. As of release 6.0.0, not worth to have this API.
`static Character`	`NULL_CHARACTER` The null character.
`static char`	`PATH_SEPARATOR_CHAR` Deprecated. As of release 6.0.0, never used and confusing.
`static String`	`PATH_SEPARATOR_STRING` Deprecated. As of release 6.0.0, never used and confusing.
`static Object`	`UNKNOWN` Denotes unknown.
`static BigDecimal`	`ZERO_BIG_DECIMAL` Represents 0 in big decimal.
`static BigInteger`	`ZERO_BIG_INTEGER` Represents 0 in big integer.
`static Byte`	`ZERO_BYTE` The zero integer.
`static Double`	`ZERO_DOUBLE` The zero double.
`static Float`	`ZERO_FLOAT` The zero float.
`static Integer`	`ZERO_INTEGER` The zero integer.
`static Long`	`ZERO_LONG` The zero long.
`static Short`	`ZERO_SHORT` The zero short.

Constructor Summary

Constructors
Constructor and Description

Objects()

Constructors
Constructor and Description
`Objects()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static Object`	`clone(Object o)` Clones the specified object.
`static boolean`	`equals(Object a, Object b)` Tests whether two objects are equals.
`static int`	`hashCode(boolean[] v)` Generates hash codes for an array of boolean.
`static int`	`hashCode(byte[] v)` Generates hash codes for an array of bytes.
`static int`	`hashCode(byte[] v, int len)` Generates hash codes for an array of bytes up to the specified length.
`static int`	`hashCode(char[] v)` Generates hash codes for an array.
`static int`	`hashCode(int[] v)` Generates hash codes for an array.
`static int`	`hashCode(long[] v)` Generates hash codes for an array.
`static int`	`hashCode(Object o)` Returns the object's hash code, or zero if null.
`static int`	`hashCode(short[] v)` Generates hash codes for an array.
`static int`	`nextHashCode(int prevHashVal, int newVal)` Returns the next hash value by giving the previous one and a new one.
`static byte[]`	`toByteArray(byte v)` Converts a byte to a big-endian byte array.
`static byte[]`	`toByteArray(int v)` Converts an integer to a big-endian byte array.
`static byte[]`	`toByteArray(long v)` Converts a long to a big-endian byte array.
`static byte[]`	`toByteArray(short v)` Converts a short to a big-endian byte array.
`static char[]`	`toCharArray(Object o)` Converts any object to a character array.
`static String`	`toString(Object o)` Converts any object to a string.

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

- Field Detail
  - UNKNOWN
```
public static final Object UNKNOWN
```
    Denotes unknown. It is useful if both null and unknown is required.
  - ZERO_LONG
```
public static final Long ZERO_LONG
```
    The zero long.
  - ZERO_INTEGER
```
public static final Integer ZERO_INTEGER
```
    The zero integer.
  - ZERO_SHORT
```
public static final Short ZERO_SHORT
```
    The zero short.
  - ZERO_BYTE
```
public static final Byte ZERO_BYTE
```
    The zero integer.
  - ZERO_FLOAT
```
public static final Float ZERO_FLOAT
```
    The zero float.
  - ZERO_DOUBLE
```
public static final Double ZERO_DOUBLE
```
    The zero double.
  - ZERO_BIG_DECIMAL
```
public static final BigDecimal ZERO_BIG_DECIMAL
```
    Represents 0 in big decimal. The same as BigDecimals.ZERO.
    
    See Also:
    
    BigDecimals.ONE
  - ZERO_BIG_INTEGER
```
public static final BigInteger ZERO_BIG_INTEGER
```
    Represents 0 in big integer. Same as BigIntegers.ZERO.
  - NULL_CHARACTER
```
public static final Character NULL_CHARACTER
```
    The null character.
  - PATH_SEPARATOR_CHAR
```
public static final char PATH_SEPARATOR_CHAR
```
    Deprecated. As of release 6.0.0, never used and confusing.
    
    See Also:
    
    Constant Field Values
  - PATH_SEPARATOR_STRING
```
public static final String PATH_SEPARATOR_STRING
```
    Deprecated. As of release 6.0.0, never used and confusing.
    
    See Also:
    
    Constant Field Values
  - BAR0_STRING
```
public static final String BAR0_STRING
```
    Deprecated. As of release 6.0.0, not worth to have this API.
    
    See Also:
    
    Constant Field Values
  - BAR1_STRING
```
public static final String BAR1_STRING
```
    Deprecated. As of release 6.0.0, not worth to have this API.
    
    See Also:
    
    Constant Field Values
  - BAR2_STRING
```
public static final String BAR2_STRING
```
    Deprecated. As of release 6.0.0, not worth to have this API.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - Objects
```
public Objects()
```
- Method Detail
  - nextHashCode
```
public static final int nextHashCode(int prevHashVal,
                                     int newVal)
```
    Returns the next hash value by giving the previous one and a new one. The caller usually uses a loop to accumulate all related fields.
    
    Parameters:
    
    prevHashVal - the previous hash value returned by this method; 0 if it is the first call.
    
    newVal - the new value to put in
    
    Returns:
    
    the new hash value
  - hashCode
```
public static final int hashCode(boolean[] v)
```
    Generates hash codes for an array of boolean. It is suggested to cache the hash code.
    
    Parameters:
    
    v - the array
    
    Returns:
    
    the hash code
  - hashCode
```
public static final int hashCode(byte[] v)
```
    Generates hash codes for an array of bytes. It is suggested to cache the hash code.
    
    Parameters:
    
    v - the array
    
    Returns:
    
    the hash code
  - hashCode
```
public static final int hashCode(byte[] v,
                                 int len)
```
    Generates hash codes for an array of bytes up to the specified length. It is suggested to cache the hash code.
    
    Parameters:
    
    v - the array
    
    len - the maximal length to generate hashCode
    
    Returns:
    
    the hash code
  - hashCode
```
public static final int hashCode(char[] v)
```
    Generates hash codes for an array. It is suggested to cache the hash code.
    
    Parameters:
    
    v - the array
    
    Returns:
    
    the hash code
  - hashCode
```
public static final int hashCode(short[] v)
```
    Generates hash codes for an array. It is suggested to cache the hash code.
    
    Parameters:
    
    v - the array
    
    Returns:
    
    the hash code
  - hashCode
```
public static final int hashCode(int[] v)
```
    Generates hash codes for an array. It is suggested to cache the hash code.
    
    Parameters:
    
    v - the byte array
    
    Returns:
    
    the hash code
  - hashCode
```
public static final int hashCode(long[] v)
```
    Generates hash codes for an array. It is suggested to cache the hash code.
    
    Parameters:
    
    v - the array
    
    Returns:
    
    the hash code
  - hashCode
```
public static final int hashCode(Object o)
```
    Returns the object's hash code, or zero if null.
  - equals
```
public static final boolean equals(Object a,
                                   Object b)
```
    Tests whether two objects are equals.
    It takes care of the null case. Thus, it is helpful to implement Object.equals.
    Notice: it uses compareTo if BigDecimal is found. So, in this case, a.equals(b) might not be the same as Objects.equals(a, b).
    If both a and b are Object[], they are compared item-by-item.
  - toCharArray
```
public static final char[] toCharArray(Object o)
```
    Converts any object to a character array.
    
    Parameters:
    
    o - the object to convert
    
    Returns:
    
    the char array or null if o is null
  - toString
```
public static final String toString(Object o)
```
    Converts any object to a string. If o is an object array, it invokes ArraysX.toString(java.lang.Object[]) to make the string more readable.
  - toByteArray
```
public static final byte[] toByteArray(int v)
```
    Converts an integer to a big-endian byte array.
  - toByteArray
```
public static final byte[] toByteArray(long v)
```
    Converts a long to a big-endian byte array.
  - toByteArray
```
public static final byte[] toByteArray(short v)
```
    Converts a short to a big-endian byte array.
  - toByteArray
```
public static final byte[] toByteArray(byte v)
```
    Converts a byte to a big-endian byte array.
  - clone
```
public static final Object clone(Object o)
```
    Clones the specified object. Use clone() if Cloneable. Otherwise, try to serialize/deserialize it by use of MarshalledObject.
    If o is null, null is returned.
    
    Throws:
    
    SystemException - if failed to clone

Class Objects

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

UNKNOWN

ZERO_LONG

ZERO_INTEGER

ZERO_SHORT

ZERO_BYTE

ZERO_FLOAT

ZERO_DOUBLE

ZERO_BIG_DECIMAL

ZERO_BIG_INTEGER

NULL_CHARACTER

PATH_SEPARATOR_CHAR

PATH_SEPARATOR_STRING

BAR0_STRING

BAR1_STRING

BAR2_STRING

Constructor Detail

Objects

Method Detail

nextHashCode

hashCode

hashCode

hashCode

hashCode

hashCode

hashCode

hashCode

hashCode

equals

toCharArray

toString

toByteArray

toByteArray

toByteArray

toByteArray

clone