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Showing content from http://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/jar/Attributes.html below:

Attributes (Java SE 15 & JDK 15)

All Implemented Interfaces:: Cloneable, Map<Object,Object>

public class Attributes
extends Object
implements Map<Object,Object>, Cloneable

The Attributes class maps Manifest attribute names to associated string values. Valid attribute names are case-insensitive, are restricted to the ASCII characters in the set [0-9a-zA-Z_-], and cannot exceed 70 characters in length. There must be a colon and a SPACE after the name; the combined length will not exceed 72 characters. Attribute values can contain any characters and will be UTF8-encoded when written to the output stream. See the

JAR File Specification

for more information about valid attribute names and values.

This map and its views have a predictable iteration order, namely the order that keys were inserted into the map, as with LinkedHashMap.

Since:: 1.2
See Also:: Manifest

Nested Class Summary Nested Classes Modifier and Type Class Description static class Attributes.Name
The Attributes.Name class represents an attribute name stored in this Map.
Nested classes/interfaces declared in interface java.util.MapMap.Entry<K,V>
Field Summary Fields Modifier and Type Field Description protected Map<Object,Object> map
The attribute name-value mappings.
Constructor Summary Constructors Constructor Description Attributes()
Constructs a new, empty Attributes object with default size.
Attributes(int size)
Constructs a new, empty Attributes object with the specified initial size.
Attributes(Attributes attr)
Constructs a new Attributes object with the same attribute name-value mappings as in the specified Attributes.
Method Summary Modifier and Type Method Description void clear()
Removes all attributes from this Map.
Object clone()
Returns a copy of the Attributes, implemented as follows:
boolean containsKey(Object name)
Returns true if this Map contains the specified attribute name (key).
boolean containsValue(Object value)
Returns true if this Map maps one or more attribute names (keys) to the specified value.
Set<Map.Entry<Object,Object>> entrySet()
Returns a Collection view of the attribute name-value mappings contained in this Map.
boolean equals(Object o)
Compares the specified object to the underlying
map
for equality.
Object get(Object name)
Returns the value of the specified attribute name, or null if the attribute name was not found.
String getValue(String name)
Returns the value of the specified attribute name, specified as a string, or null if the attribute was not found.
String getValue(Attributes.Name name)
Returns the value of the specified Attributes.Name, or null if the attribute was not found.
int hashCode()
Returns the hash code value for this Map.
boolean isEmpty()
Returns true if this Map contains no attributes.
Set<Object> keySet()
Returns a Set view of the attribute names (keys) contained in this Map.
Object put(Object name, Object value)
Associates the specified value with the specified attribute name (key) in this Map.
void putAll(Map<?,?> attr)
Copies all of the attribute name-value mappings from the specified Attributes to this Map.
String putValue(String name, String value)
Associates the specified value with the specified attribute name, specified as a String.
Object remove(Object name)
Removes the attribute with the specified name (key) from this Map.
int size()
Returns the number of attributes in this Map.
Collection<Object> values()
Returns a Collection view of the attribute values contained in this Map.
Methods declared in interface java.util.Mapcompute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Details
- map
  The attribute name-value mappings.
Constructor Details
- Attributes
  public Attributes()
  
  Constructs a new, empty Attributes object with default size.
- Attributes
  public Attributes(int size)
  
  Constructs a new, empty Attributes object with the specified initial size.
  
  Parameters:
  
  size - the initial number of attributes
- Attributes
  Constructs a new Attributes object with the same attribute name-value mappings as in the specified Attributes.
  
  Parameters:
  
  attr - the specified Attributes
Method Details
- get
  Returns the value of the specified attribute name, or null if the attribute name was not found.
  
  Specified by:
  
  get in interface Map<Object,Object>
  
  Parameters:
  
  name - the attribute name
  
  Returns:
  
  the value of the specified attribute name, or null if not found.
- getValue
  Returns the value of the specified attribute name, specified as a string, or null if the attribute was not found. The attribute name is case-insensitive.
  
  This method is defined as:
```
      return (String)get(new Attributes.Name((String)name));
 
```
  Parameters:
  
  name - the attribute name as a string
  
  Returns:
  
  the String value of the specified attribute name, or null if not found.
  
  Throws:
  
  IllegalArgumentException - if the attribute name is invalid
- getValue
  Returns the value of the specified Attributes.Name, or null if the attribute was not found.
  
  This method is defined as:
```
     return (String)get(name);
 
```
  Parameters:
  
  name - the Attributes.Name object
  
  Returns:
  
  the String value of the specified Attribute.Name, or null if not found.
- put
  Associates the specified value with the specified attribute name (key) in this Map. If the Map previously contained a mapping for the attribute name, the old value is replaced.
  
  Specified by:
  
  put in interface Map<Object,Object>
  
  Parameters:
  
  name - the attribute name
  
  value - the attribute value
  
  Returns:
  
  the previous value of the attribute, or null if none
  
  Throws:
  
  ClassCastException - if the name is not a Attributes.Name or the value is not a String
- putValue
  Associates the specified value with the specified attribute name, specified as a String. The attributes name is case-insensitive. If the Map previously contained a mapping for the attribute name, the old value is replaced.
  
  This method is defined as:
```
      return (String)put(new Attributes.Name(name), value);
 
```
  Parameters:
  
  name - the attribute name as a string
  
  value - the attribute value
  
  Returns:
  
  the previous value of the attribute, or null if none
  
  Throws:
  
  IllegalArgumentException - if the attribute name is invalid
- remove
  Removes the attribute with the specified name (key) from this Map. Returns the previous attribute value, or null if none.
  
  Specified by:
  
  remove in interface Map<Object,Object>
  
  Parameters:
  
  name - attribute name
  
  Returns:
  
  the previous value of the attribute, or null if none
- containsValue public boolean containsValue
  (
  Object value)
  Returns true if this Map maps one or more attribute names (keys) to the specified value.
  
  Specified by:
  
  containsValue in interface Map<Object,Object>
  
  Parameters:
  
  value - the attribute value
  
  Returns:
  
  true if this Map maps one or more attribute names to the specified value
- containsKey public boolean containsKey
  (
  Object name)
  Returns true if this Map contains the specified attribute name (key).
  
  Specified by:
  
  containsKey in interface Map<Object,Object>
  
  Parameters:
  
  name - the attribute name
  
  Returns:
  
  true if this Map contains the specified attribute name
- putAll public void putAll
  (
  Map<?,?> attr)
  Copies all of the attribute name-value mappings from the specified Attributes to this Map. Duplicate mappings will be replaced.
  
  Specified by:
  
  putAll in interface Map<Object,Object>
  
  Parameters:
  
  attr - the Attributes to be stored in this map
  
  Throws:
  
  ClassCastException - if attr is not an Attributes
- clear
  public void clear()
  
  Removes all attributes from this Map.
  
  Specified by:
  
  clear in interface Map<Object,Object>
- size
  public int size()
  
  Returns the number of attributes in this Map.
  
  Specified by:
  
  size in interface Map<Object,Object>
  
  Returns:
  
  the number of key-value mappings in this map
- isEmpty
  public boolean isEmpty()
  
  Returns true if this Map contains no attributes.
  
  Specified by:
  
  isEmpty in interface Map<Object,Object>
  
  Returns:
  
  true if this map contains no key-value mappings
- keySet
  Returns a Set view of the attribute names (keys) contained in this Map.
  
  Specified by:
  
  keySet in interface Map<Object,Object>
  
  Returns:
  
  a set view of the keys contained in this map
- values
  Returns a Collection view of the attribute values contained in this Map.
  
  Specified by:
  
  values in interface Map<Object,Object>
  
  Returns:
  
  a collection view of the values contained in this map
- entrySet
  Returns a Collection view of the attribute name-value mappings contained in this Map.
  
  Specified by:
  
  entrySet in interface Map<Object,Object>
  
  Returns:
  
  a set view of the mappings contained in this map
- equals public boolean equals
  (
  Object o)
  Compares the specified object to the underlying
  map
  for equality. Returns true if the given object is also a Map and the two maps represent the same mappings.
  
  Specified by:
  
  equals in interface Map<Object,Object>
  
  Overrides:
  
  equals in class Object
  
  Parameters:
  
  o - the Object to be compared
  
  Returns:
  
  true if the specified Object is equal to this Map
  
  See Also:
  
  Object.hashCode(), HashMap
- hashCode
  public int hashCode()
  
  Returns the hash code value for this Map.
  
  Specified by:
  
  hashCode in interface Map<Object,Object>
  
  Overrides:
  
  hashCode in class Object
  
  Returns:
  
  a hash code value for this object.
  
  See Also:
  
  Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
- clone
  Returns a copy of the Attributes, implemented as follows:
```
     public Object clone() { return new Attributes(this); }
 
```
  Since the attribute names and values are themselves immutable, the Attributes returned can be safely modified without affecting the original.
  
  Overrides:
  
  clone in class Object
  
  Returns:
  
  a clone of this instance.
  
  See Also:
  
  Cloneable

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