Read value from Java properties

Here, you will find the source code to read value of the key from properties file. java.util.Properties class extends Hashtable. Properties class creates the properties file which stores key - value pair using Hashtable. To retrieve value from properties file we have to follow following steps.

1. Create an object of Properties class.
2. Load properties file using FileInputStream into properties object.
3. Get value from properties object using getProperty() method passing key as an input.

The below code will help to understand more...

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;

public class PropertiesReadTest {

    public static void main(String[] args) {
        Properties properties = new Properties();
        try {
            properties.load(new FileInputStream("C:\\temp\\test.properties"));
            String value = properties.getProperty("key");
            System.out.println("Value = " + value);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Output is shown here in following image