File encoding

Apache Commons IO
Apache Commons Lang

import java.io.*;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.SystemUtils;
import org.apache.commons.io.FileUtils;

public class Main {

  public static void main(String[] args) throws Exception {
    String[] texts = {"台灣","中国","ニュース","한국","========="};
    String encoding = "UTF-8";
    File file = new File("text.txt");
    
    PrintStream ps = new java.io.PrintStream(new FileOutputStream(file));
    try {
      for (String text : texts) {
        ps.println(text); 
      }
    } finally {
      ps.close();
    }

    BufferedReader br = new BufferedReader(new InputStreamReader(
        new FileInputStream(file), encoding));
    try {
      String line;
      while ((line = br.readLine()) != null) {
        System.out.println(line);
      }
    } finally {
      br.close();
    }
        
    String data =StringUtils.join(texts, SystemUtils.LINE_SEPARATOR);
    FileUtils.writeStringToFile(file, data, encoding);
    
    System.out.println(FileUtils.readFileToString(file, encoding));
  }

}