Properties Class in Java | Java Collections | Colletion Framework | Java Tutorial For Beginners смотреть онлайн

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Properties class is child class of Hashtable.
Values which changes frequently can be managed using properties files.
Values which changes frequently can not be hard coded in the java program. Each change in the source file requires recompile, rebuild, redeploy of the application which is very costly operation.
Ex: DB UserName
DB Password
Application URL
To avoid these things, need to configure these properties in Properties file.
Properties object can be used to hold the properties which are coming from the Properties file.
Properties file can be used to represent a group of Key-Value pairs where both the key and values are of String type.

Methods:

String getProperty(String propertyName): Returns value associated with the specified property.
String setProperty(String propertyName, String propertyValue): It set the new property in the properties file and returns the old value if the property already available. Returns null if the specified property not available.
Enumeration propertyNames(): Returns all property names.
void load(InputStream is): To load properties from Properties File to Java Properties Object.
void store(OutputStream os, String comment): To store properties from Java Properties Object to Properties File.


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