Properties getProperty(key, defaultValue) method in Java with Examples

The getProperty(key, defaultValue) 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 the defaultValue.

Syntax:

public String getProperty(String key, String defaultValue)

Parameters: This method accepts two parameter:

• key: whose mapping is to be checked in this Properties object.
• defaultValue: which is the default mapping of the key

Returns: This method returns the value fetched corresponding to this key, if present. If there is no such mapping, then it returns the defaultValue.

Below programs illustrate the getProperty(key, defaultValue) method:

Program 1:

// Java program to demonstrate
// getProperty(key, defaultValue) 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", 200));

        // Getting the value of Phone
        System.out.println("Value of Phone: "
                           + properties
                                 .getProperty("Phone", 200));
    }
}

Output:

Properties: {Book=500, Mobile=5000, Pen=10, Clothes=400}
Value of Pen: 10
Value of Phone: 200

Program 2:

// Java program to demonstrate
// getProperty(key, defaultValue) 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, "200RS"));

        // Getting the value of 5
        System.out.println("Value of 5: "
                           + properties
                                 .getProperty(5, "200RS"));
    }
}

Output:

Current Properties: {3=1000RS, 2=500RS, 1=100RS}
Value of 1: 100RS
Value of 5: 200RS

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