Java 比较两个任意文件是否相同

import java.io.*;

public class FileCompare {
   public static void main(String[] args) {
       System.out.println("请依次输入两个文件的全路径和文件名：");
       System.out.println("firstFile:");
       String firstFile = inputFileName();
       System.out.println("secondFile:");
       String secondFile = inputFileName();
       System.out.println("Start to compare ...");
       FileCompare fileCompare = new FileCompare();
       fileCompare.compareFile(firstFile, secondFile);
   }

   private void compareFile(String firFile, String secFile) {
       try {
           BufferedInputStream fir = new BufferedInputStream(new FileInputStream(firFile));
           BufferedInputStream sec = new BufferedInputStream(new FileInputStream(secFile));
           //比较文件的长度是否一样
           if (fir.available() == sec.available()) {
               while (fir.read() != -1 && sec.read() != -1) {
                   if (fir.read() != sec.read()) {
                       System.out.println("Files not same!");
                       break;
                   }
               }
               System.out.println("two files are same!");
           } else {
               System.out.println("two files are different!");
           }
           fir.close();
           sec.close();
           return;
       } catch (FileNotFoundException e) {
           e.printStackTrace();
       } catch (IOException e) {
           e.printStackTrace();
       }
   }

   private static String inputFileName() {
       BufferedReader buffRead = new BufferedReader(new InputStreamReader(System.in));
       String fileName = null;
       try {
           fileName = buffRead.readLine();
       } catch (IOException e) {
           e.printStackTrace();
       }
       return fileName;
   }
}