- Java.util Package Classes
- Java.util - Home
- Java.util - ArrayDeque
- Java.util - ArrayList
- Java.util - Arrays
- Java.util - BitSet
- Java.util - Calendar
- Java.util - Collections
- Java.util - Currency
- Java.util - Date
- Java.util - Dictionary
- Java.util - EnumMap
- Java.util - EnumSet
- Java.util - Formatter
- Java.util - GregorianCalendar
- Java.util - HashMap
- Java.util - HashSet
- Java.util - Hashtable
- Java.util - IdentityHashMap
- Java.util - LinkedHashMap
- Java.util - LinkedHashSet
- Java.util - LinkedList
- Java.util - ListResourceBundle
- Java.util - Locale
- Java.util - Observable
- Java.util - PriorityQueue
- Java.util - Properties
- Java.util - PropertyPermission
- Java.util - PropertyResourceBundle
- Java.util - Random
- Java.util - ResourceBundle
- Java.util - ResourceBundle.Control
- Java.util - Scanner
- Java.util - ServiceLoader
- Java.util - SimpleTimeZone
- Java.util - Stack
- Java.util - StringTokenizer
- Java.util - Timer
- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
- Java.util - Useful Resources
- Java.util - Discussion
Java Properties propertyNames() Method
Description
The java Properties propertyNames() method returns an enumeration of all the keys in this property list, including distinct keys in the default property list if a key of the same name has not already been found from the main properties list.
Declaration
Following is the declaration for java.util.Properties.propertyNames() method
public Enumeration<?> propertyNames()
Parameters
NA
Return Value
This method returns an enumeration of all the keys in this property list, including the keys in the default property list.
Exception
ClassCastException − if any key in this property list is not a string.
Getting a Names of the Keys from a Properties Example
The following example shows the usage of java.util.Properties.propertyNames() method.
package com.tutorialspoint; import java.util.Enumeration; import java.util.Properties; public class PropertiesDemo { public static void main(String[] args) { Properties prop = new Properties(); // add some properties prop.put("Height", "200"); prop.put("Width", "15"); // assign the property names in a enumaration Enumeration<?> enumeration = prop.propertyNames(); // print the enumaration elements while(enumeration.hasMoreElements()) { System.out.println("" + enumeration.nextElement()); } } }
Output
Let us compile and run the above program, this will produce the following result −
Width Height
java_util_properties.htm
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