Package com.sun.interview
Class Properties2
- java.lang.Object
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- java.util.Dictionary<K,V>
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- java.util.Hashtable<java.lang.String,java.lang.Object>
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- com.sun.interview.Properties2
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Cloneable
,java.util.Map<java.lang.String,java.lang.Object>
public class Properties2 extends java.util.Hashtable<java.lang.String,java.lang.Object>
TheProperties
class represents a persistent set of properties. TheProperties
can be saved to a stream or loaded from a stream. Each key and its corresponding value in the property list is a string.A property list can contain another property list as its "defaults"; this second property list is searched if the property key is not found in the original property list.
This class is similar to java.util.Properties, but has upgraded capabilities.
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description protected Properties2
defaults
A property list that contains default values for any keys not found in this property list.
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Constructor Summary
Constructors Constructor Description Properties2()
Creates an empty property list with no default values.Properties2(Properties2 defaults)
Creates an empty property list with the specified defaults.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.String
getProperty(java.lang.String key)
Searches for the property with the specified key in this property list.java.lang.String
getProperty(java.lang.String key, java.lang.String defaultValue)
Searches for the property with the specified key in this property list.void
list(java.io.PrintWriter out)
Prints this property list out to the specified output stream.void
load(java.io.Reader in)
Reads a property list from an input stream.void
load(java.util.Properties source)
java.util.Enumeration<java.lang.String>
propertyNames()
Returns an enumeration of all the keys in this property list, including the keys in the default property list.void
save(java.io.Writer out, java.lang.String header)
Stores this property list to the specified output stream.-
Methods inherited from class java.util.Hashtable
clear, clone, compute, computeIfAbsent, computeIfPresent, contains, containsKey, containsValue, elements, entrySet, equals, forEach, get, getOrDefault, hashCode, isEmpty, keys, keySet, merge, put, putAll, putIfAbsent, rehash, remove, remove, replace, replace, replaceAll, size, toString, values
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Field Detail
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defaults
protected Properties2 defaults
A property list that contains default values for any keys not found in this property list.
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Constructor Detail
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Properties2
public Properties2()
Creates an empty property list with no default values.
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Properties2
public Properties2(Properties2 defaults)
Creates an empty property list with the specified defaults.- Parameters:
defaults
- the defaults.
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Method Detail
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load
public void load(java.util.Properties source)
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load
public void load(java.io.Reader in) throws java.io.IOException
Reads a property list from an input stream.- Parameters:
in
- the input stream.- Throws:
java.io.IOException
- if an error occurred when reading from the input stream.
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save
public void save(java.io.Writer out, java.lang.String header)
Stores this property list to the specified output stream. The string header is printed as a comment at the beginning of the stream.- Parameters:
out
- an output stream.header
- a description of the property list.
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getProperty
public java.lang.String getProperty(java.lang.String key)
Searches for the property with the specified key in this property list. If the key is not found in this property list, the default property list, and its defaults, recursively, are then checked. The method returnsnull
if the property is not found.- Parameters:
key
- the property key.- Returns:
- the value in this property list with the specified key value.
- See Also:
defaults
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getProperty
public java.lang.String getProperty(java.lang.String key, java.lang.String defaultValue)
Searches for the property with the specified key in this property list. If the key is not found in this property list, the default property list, and its defaults, recursively, are then checked. The method returns the default value argument if the property is not found.- Parameters:
key
- the hashtable key.defaultValue
- a default value.- Returns:
- the value in this property list with the specified key value.
- See Also:
defaults
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propertyNames
public java.util.Enumeration<java.lang.String> propertyNames()
Returns an enumeration of all the keys in this property list, including the keys in the default property list.- Returns:
- an enumeration of all the keys in this property list, including the keys in the default property list.
- See Also:
Enumeration
,defaults
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list
public void list(java.io.PrintWriter out)
Prints this property list out to the specified output stream. This method is useful for debugging.- Parameters:
out
- an output stream.
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