继承和创建UTF-8文件时出现错误

我已经测试了最好、更安全的生产方式 UTF-8型 文本文件,但当我在多个文件中使用它时 抽象类 ,它生产 ANSI格式 文件不是UTF-8格式! 有什么bug或什么东西可以阻止它吗? 同样,我的代码是正确的,当我将所有代码放在一个类中时,程序可以创建 UTF-8型 文件没有任何问题。

我通过测试所需的3个类文件为您提供代码:

类A0.java:

public class A0 extends A1 {

public static void main(String[] args) {
    // if you want to use A1 which is extended by this class
    // uncomment this two lines
    // A1 run = new A1();
    // run.save();
    // But if you want to use A2 which isn't extended or inherited
    // uncomment this lines
    // A2 a2 = new A2();
    // try {
    // a2.create_new_file("c:/test.txt");
    // a2.append_line_to_file("برنامه نویسی");
    // } catch (Exception e) {
    // }
    // Question: Why in A1 we cannot produce properly UTF-8 text file?
 }
}

A1.java类:

public class A1 extends A2{
protected void save() {
    A2 a2 = new A2();
    try {
        a2.create_new_file("c:/test.txt");
        a2.append_line_to_file("برنامه نویسی");
    } catch (Exception e) {
    }
 }
}

类A2.java:

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;

public class A2 {
private BufferedWriter writer;

public void create_new_file(String file_address) throws Exception {
    writer = new BufferedWriter(new FileWriter(file_address, true));
    Files.newBufferedWriter(Paths.get(file_address), Charset.forName("UTF8"));
    writer = new BufferedWriter(new FileWriter(file_address, true));
}

public void append_line_to_file(String line) throws IOException {
    try {
        writer.write(line);
        writer.newLine();
        writer.flush();
    } catch (Exception e) {
    }
 }
}