Properties getProperty(key) method in Java with Examples

23 May, 2019
The getProperty(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 getProperty(String key)
Parameters: This method accepts a parameter key whose mapping is to be checked in this Properties object.
Returns: This method returns the value fetched corresponding to this key, if present. If there is no such mapping, then it returns null.
Below programs illustrate the getProperty(key) method:
Program 1:
// Java program to demonstrate// getProperty(key) 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());          // Getting the value of Pen        System.out.println("Value of Pen: "                           + properties                                 .getProperty("Pen"));          // Getting the value of Phone        System.out.println("Value of Phone: "                           + properties                                 .getProperty("Phone"));    }}
Properties: {Book=500, Mobile=5000, Pen=10, Clothes=400}
Value of Pen: null
Value of Phone: null

Program 2:
// Java program to demonstrate// getProperty(key) 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(1, "100RS");        properties.put(2, "500RS");        properties.put(3, "1000RS");          // Print Properties details        System.out.println("Current Properties: "                           + properties                                 .toString());          // Getting the value of 1        System.out.println("Value of 1: "                           + properties                                 .getProperty("1"));          // Getting the value of 5        System.out.println("Value of 5: "                           + properties                                 .getProperty("5"));    }}
Current Properties: {3=1000RS, 2=500RS, 1=100RS}
Value of 1: null
Value of 5: null

References: https://docs.oracle.com/javase/9/docs/api/java/util/Properties.html#getProperty-java.lang.String-
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