Best way to build a String out of characters

This question already has an answer here:

Read/convert an InputStream to a String 56 answers

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你可以做类似的事情

public String readTextFile(File file) {
      StringBuilder sb = new StringBuilder();
      try(BufferedReader br = new BufferedReader(new FileReader(file))){
          String line;
          while ((line = br.readLine()) != null){
              sb.append(line);
          }
      }
      return sb.toString();
}

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