PropertiesMain.java

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
 
public class PropertiesMain {
 
    /**
     * @param args
     * @author tolpp
     */
    public static void main(String[] args) {
        addToProperties();
        printProperties();
    }
 
    private static void addToProperties() {
        Properties prop = new Properties();
 
        try {
            // property verileri atanır
            prop.setProperty("database", "default");
            prop.setProperty("dbuser", "root");
            prop.setProperty("dbpassword", "");
 
            // config dosyası kaydedilir.
            prop.store(new FileOutputStream("config.properties"), null);
 
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
 
    private static void printProperties() {
        Properties prop = new Properties();
 
        try {
            prop.load(new FileInputStream("config.properties"));
 
            System.out.println("=== Istenilen Propertyler ===");
            System.out.println(prop.getProperty("database"));
            System.out.println(prop.getProperty("dbuser"));
            System.out.println(prop.getProperty("dbpassword","")); //dbpassword propertysi yoksa default olarak bos string doner
 
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
}