In this blog, we will see How to Read Data From Properties File in Java. This will be asked in the most of the interview questions.

Things to Remember:

1. Mostly, the properties file is used to maintain the configurable parameters of the project.
2. Extension for this file is “.properties”
3. Properties file data will be in a Key and Value pair format.
4. whenever you’re creating a properties file, maintain the keys in unique format. Don’t use the existing key for your new value.
   • If you use the existing key again, then whenever control searches for that key it will return the last searched value. This might leads to conflicts.

#CONFIG File
username = Username
password = pass
firstname = fname

In the below snippet, we have done the following to Read Data from properties file:

1. Created a new folder under our project and created  a new properties file with some data
2. Created a object and assigned the file location of this newly created properties file using FileInputStream class.
3. Created a object for the Properties class.
4. Loaded all the properties of our file using Properties.load() method.
5. Using .getProperty() method, we can load all our data using Key as a parameter.
6. Then, it prints the corresponding value of that key.

package Javaprograms;

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

public class ReadDataFromPropertiesFile {

	public static void main(String[] args) throws Exception {
		FileInputStream fis = new FileInputStream("E:/Selenium/SeleniumPrgrms/resources/config.properties");
		Properties prop = new Properties();
		
		prop.load(fis);
		
		String user = prop.getProperty("username");
		String pword = prop.getProperty("password");
		String fname = prop.getProperty("firstname");
		
		System.out.println(user);
		System.out.println(pword);
		System.out.println(fname);
	}

}

Output:
--------
username = Username
password = pass
firstname = fname

Please watch the Youtube video for better understanding.

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