package writeToProperties;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
public class WriteToProperties {
public void addUser(String name??String password){
FileInputStream fis = null;
Properties pro = new Properties();
/*
* ?ó????properties?????????properties??????????
*/
try {
fis = new FileInputStream("user.properties");//???????????
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
pro.load(fis);  //????
} catch (IOException e) {
e.printStackTrace();
}
pro.setProperty(name?? password);   //???properties
/*
* ????????propertiesд?????
*/
FileOutputStream fos = null;
try {
fos = new FileOutputStream("user.properties");  //?????????????
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
pro.store(fos??"#");        //д?????
} catch (IOException e) {
e.printStackTrace();
}
try {
fis.close();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
WriteToProperties wtp = new WriteToProperties();
wtp.addUser("lucy"?? "123");
wtp.addUser("lily"?? "123");
}
}
????????????IO??????????????????????????????????????????????????
?????????user.propertiesλ??????????
???????裺???????????????檔