Properties keySet() method in Java with Examples Last Updated : 23 May, 2019 Comments Improve Suggest changes Like Article Like Report The keySet() method of Properties class is used to create a set out of the key elements contained in the Properties. It basically returns a set view of the keys or we can create a new set and store the key elements in them. Syntax: public Set keySet() Parameters: This method accepts no parameters Returns: This method returns a Set view of the keys contained in this Properties object. Below programs show the implementation of int keySet() method. Program 1: Java // Java code to show the implementation of // keySet() method import java.util.*; public class GfG { // Main method public static void main(String[] args) { // Create a properties and add some values Properties properties = new Properties(); properties.put("Pen", 10); properties.put("Book", 500); properties.put("Clothes", 400); properties.put("Mobile", 5000); // Print Properties details System.out.println("Properties: " + properties.toString()); System.out.println("keySet: " + properties.keySet()); } } Output: Properties: {Book=500, Mobile=5000, Pen=10, Clothes=400} keySet: [Book, Mobile, Pen, Clothes] Program 2: Java // Java program to demonstrate // keySet() method. import java.util.*; public class GFG { // Main method public static void main(String[] args) { // Create a properties and add some values Properties properties = new Properties(); // Inserting elements into the properties properties.put("Geeks", 10); properties.put("4", 15); properties.put("Geeks", 20); properties.put("Welcomes", 25); properties.put("You", 30); // Print Properties details System.out.println("Current Properties: " + properties.toString()); System.out.println("keySet: " + properties.keySet()); } } Output: Current Properties: {You=30, Welcomes=25, 4=15, Geeks=20} keySet: [You, Welcomes, 4, Geeks] References: https://docs.oracle.com/javase/9/docs/api/java/util/Properties.html#keySet-- Comment More infoAdvertise with us Next Article Properties keySet() method in Java with Examples K Kirti_Mangal Follow Improve Article Tags : Java Java - util package Java-Functions Java-Properties Practice Tags : Java Similar Reads Properties keys() method in Java with Examples The keys() method of Properties class is used to get the enumeration of the keys in this Properties object. This enumeration can be used to traverse and iterate the keys sequentially. Syntax: public Enumeration keys() Parameters: This method accepts no parameters Returns: This method returns an Enum 2 min read Properties get(key) method in Java with Examples The get(key) method of Properties class is used to get the value mapped to this key, passed as the parameter, in this Properties object. This method will fetch the corresponding value to this key, if present, and return it. If there is no such mapping, then it returns null. Syntax: public Object get 2 min read Provider keySet() method in Java with Examples The keySet() method of java.security.Provider class is used to return an unmodifiable Set view of the property keys contained in this provider. Syntax: public Set keySet() Return Value: This method returns a set view of the keys contained in this map. Below are the examples to illustrate the keySet( 3 min read TreeMap keySet() Method in Java with Examples In Java, keySet() method of TreeMap class is present inside java.util package in Java is used to create a set out of the key elements contained in the treemap. It basically returns a set view of the keys or we can create a new set and store the key elements in them in ascending order. Since the set 3 min read Properties clear() method in Java with Examples The Java.util.Properties.clear() method is used to remove all the elements from this Properties instance. Using the clear() method only clears all the element from the Properties and does not delete the Properties. In other words, we can say that the clear() method is used to only empty an existing 2 min read Like