比较两个文件在Java中

问题描述

我试图比较两个.txt文件（即它们的内容），但是当我执行这个代码时，我的应用程序进入了一个无限循环。为什么？

$ p $ public int compareFile（String fILE_ONE2，String fILE_TWO2）throws Exception
{

文件f1 =新文件（fILE_ONE2）; // OUTFILE
文件f2 =新文件（fILE_TWO2）; // INPUT

FileReader fR1 =新的FileReader（f1）;
FileReader fR2 =新的FileReader（f2）;

BufferedReader reader1 = new BufferedReader（fR1）;
BufferedReader reader2 = new BufferedReader（fR2）;

String line1 = null;
String line2 = null;
int flag = 1; （（flag = 1）&（（line1 = reader1.readLine（））！= null）&&（（line2 = reader2.readLine（））！= null））

{
if（！line1.equalsIgnoreCase（line2））
flag = 0;
else
flag = 1;
}
reader1.close（）;
reader2.close（）;
返回标志;





解决方案

我假设您正在比较两个小尺寸文本文件。

  import java.io. *; 
 $ b $ public class Diff {
 public static void main（String [] args）抛出FileNotFoundException，IOException {
 
文件f1 = new File（args [0]） ; //输出
文件f2 =新文件（args [1]）; // INPUT 
 
 FileReader fR1 =新FileReader（f1）; 
 FileReader fR2 =新的FileReader（f2）; 
 
 BufferedReader reader1 = new BufferedReader（fR1）; 
 BufferedReader reader2 = new BufferedReader（fR2）; 
 
 String line1 = null; 
 String line2 = null; 
 int flag = 1; （（flag = 1）&（（line1 = reader1.readLine（））！= null）
 
&&（（line2 = reader2.readLine（））！= null））{
 if（！line1.equalsIgnoreCase（line2））
 flag = 0; 
} 
 reader1.close（）; 
 reader2.close（）; 
 System.out.println（Flag+ flag）; 
 
 
 
 
 $ b我在2个不同的文本文件上运行它。这是输出。
  javac Diff.java&& java Diff a.txt b.txt 
 Flag 0 
  
如果你认为你有一个无限的循环，问题可能在其他地方。
 
I am trying to compare two .txt files (i.e their contents), but when I execute this code my application goes into an infinite loop.  Why?
public int compareFile(String fILE_ONE2, String fILE_TWO2)throws Exception
{

File f1 = new File(fILE_ONE2); //OUTFILE
File f2 = new File(fILE_TWO2); //INPUT

FileReader fR1 = new FileReader(f1);
FileReader fR2 = new FileReader(f2);

BufferedReader reader1 = new BufferedReader(fR1);
BufferedReader reader2 = new BufferedReader(fR2);

String line1 = null;
String line2 = null;
int flag=1;
while ((flag==1) &&((line1 = reader1.readLine()) != null)&&((line2 = reader2.readLine()) != null))
{
    if (!line1.equalsIgnoreCase(line2))
        flag=0;
    else
        flag=1;
}
reader1.close();
reader2.close();
return flag;


}
 解决方案 
I converted your code into a main program.  There is no infinite loop in this code.
I am assuming you are comparing 2 text files of a small-ish size.
import java.io.*;

public class Diff {
    public static void main(String[] args) throws FileNotFoundException, IOException {

        File f1 = new File(args[0]);// OUTFILE
        File f2 = new File(args[1]);// INPUT

        FileReader fR1 = new FileReader(f1);
        FileReader fR2 = new FileReader(f2);

        BufferedReader reader1 = new BufferedReader(fR1);
        BufferedReader reader2 = new BufferedReader(fR2);

        String line1 = null;
        String line2 = null;
        int flag = 1;
        while ((flag == 1) && ((line1 = reader1.readLine()) != null)
                && ((line2 = reader2.readLine()) != null)) {
            if (!line1.equalsIgnoreCase(line2))
                flag = 0;
        }
        reader1.close();
        reader2.close();
        System.out.println("Flag " + flag);
    }
}
I ran it on 2 small different text files.  This is the output.
javac Diff.java && java Diff a.txt b.txt
Flag 0
If you think you have an infinite loop, the issue might be elsewhere.
                        
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