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使用FileReader读取reader.txt文本文件中的数据,reader.txt中的内容为:abcimport java.io.*;public class Example01 { public static void main(String[] args) throws Exception { FileReader reader = new FileReader("reader.txt"); int ch; while ((ch = reader.read()) != -1) { System.out.print(ch+" "); } reader.close(); }}运行以上程序的结果是( )