Java文件-打开文件并写入文件

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BufferedWriter out = null;try {    FileWriter fstream = new FileWriter("out.txt", true); //true tells to append data.    out = new BufferedWriter(fstream);    out.write("nsue");}catch (IOException e) {    System.err.println("Error: " + e.getMessage());}finally {    if(out != null) {        out.close();    }}