Properties class in Java

The properties object contains key and value pair both as a string. The java.util.Properties class is the subclass of Hashtable.

It can be used to get property value based on the property key. The Properties class provides methods to get data from properties file and store data into properties file. Moreover, it can be used to get properties of system.

Advantage of properties file

Recompilation is not required, if information is changed from properties file: If any information is changed from the properties file, you don't need to recompile the java class. It is used to store information which is to be changed frequently.

Method Description
public void load(Reader r) loads data from the Reader object.
public void load(InputStream is) loads data from the InputStream object
public String getProperty(String key) returns value based on the key.
public void setProperty(String key,String value) sets the property in the properties object.
public void store(Writer w, String comment) writers the properties in the writer object.
public void store(OutputStream os, String comment) writes the properties in the OutputStream object.
storeToXML(OutputStream os, String comment) writers the properties in the writer object for generating xml document.

EXAMPLE

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