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

public class JProperties {
    public static void main(String[]args)throws IOException{
        // create and load default properties
        Properties defaultProps = new Properties();
        FileInputStream in = new FileInputStream("properties.txt");
        defaultProps.load(in);
        in.close();
        System.out.println((String)defaultProps.get("txt"));
    }

}