The properties protest will have esteem and key consolidate both as a string. It can be used to get the estimation of property in perspective of the property key. The Properties class offers procedures to get data from properties report and store data into properties record. Moreover, it can be used to get properties of the system. The java.util.Properties class is the subclass of Hashtable. The essential preferred standpoint of java.util.Properties class is that recompilation is not required. Following is the syntax declaration of the class. [java] public class Properties extends Hashtable<Object,Object> [/java]

Following are the constructors of the java.util Properties Class.

Following are the methods of the java.util Properties Class.

Following is the syntax declaration of the method. [java]public String getProperty(String key)[/java] DemoProperties.java [java] package com.SPlessons; import java.util.*; public class DemoProperties { public static void main(String[] args) { Properties prop = new Properties(); // add some properties prop.put("SPlessons", "200"); prop.put("splessons", "150"); prop.put("Scannable", "true"); // get two properties and print them System.out.println("" + prop.getProperty("SPlessons")); System.out.println("" + prop.getProperty("Scannable")); } } [/java] In the above example, for the given key corresponding value is going to be generated in the output. Output: Now compile the code result will be as follows. [java] 200 true [/java]

Following is the syntax declaration of the method. [java]public void list(PrintStream out)[/java] DemoProperties.java [java] package com.SPlessons; import java.util.*; public class DemoProperties { public static void main(String[] args) { Properties prop = new Properties(); // add some properties prop.put("SPlessons", "200"); prop.put("splessons", "150"); prop.put("Scannable", "true"); // print the list with System.out prop.list(System.out); } } [/java] In the above example, System.out is used to display the elements which were in the list. Output: Now compile the code result will be as follows. [java] -- listing properties -- splessons=150 SPlessons=200 Scannable=true [/java]

Following is the syntax declaration of the method. [java]public void list(PrintWriter out)[/java] DemoProperties.java [java] package com.SPlessons; import java.io.PrintWriter; import java.util.*; public class DemoProperties { public static void main(String[] args) { Properties prop = new Properties(); PrintWriter writer = new PrintWriter(System.out); // add some properties prop.put("SPlessons", "200"); prop.put("splessons", "150"); prop.put("Scannable", "true"); // print the list with a PrintWriter object prop.list(writer); // flush the stream writer.flush(); } } [/java] In the above example, PrintWriter belongs to java.io package. The java.util.Properties.list() method does not return any value. Output: Now compile the code result will be as follows. [java] -- listing properties -- splessons=150 SPlessons=200 Scannable=true [/java]

Following is the syntax declaration of the method. [java]public void load(InputStream inStream)[/java] DemoProperties.java [java] package com.SPlessons; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.PrintWriter; import java.util.*; public class DemoProperties { public static void main(String[] args) { Properties prop = new Properties(); String s = "SPLESSONS=200"; String s2 = "splessons=15"; try { // create a new input and output stream FileOutputStream fos = new FileOutputStream("properties.txt"); FileInputStream fis = new FileInputStream("properties.txt"); // write the first property in the output stream file fos.write(s.getBytes()); // change the line between the two properties fos.write("\n".getBytes()); // write next property fos.write(s2.getBytes()); // load from input stream prop.load(fis); // print the properties list from System.out prop.list(System.out); } catch (IOException ex) { ex.printStackTrace(); } } } [/java] Following is a method explanation diagram. Output: Now compile the code result will be as follows. [java] -- listing properties -- splessons=15 SPLESSONS=200 [/java]

Following is the syntax declaration of the method. [java]public Enumeration<?> propertyNames()[/java] DemoProperties.java [java] package com.SPlessons; import java.util.*; public class DemoProperties { public static void main(String[] args) { Properties prop = new Properties(); // add some properties prop.put("WWW.SPLESSONS.COM", "320"); prop.put("www.splessons.com", "215"); // assign the property names in a enumaration Enumeration<?> enumeration = prop.propertyNames(); // print the enumaration elements System.out.println("" + enumeration.nextElement()); System.out.println("" + enumeration.nextElement()); } } [/java] In the above example, enumeration of all keys will be displayed. Output: Now compile the code result will be as follows. [java] WWW.SPLESSONS.COM www.splessons.com [/java]

• The java.util.Properties.list() method is utilized for debugging.
• An enumeration of all the keys will be returned by java.util.Properties.propertyNames() method