[英]Read and Write in the same file simultaneously in Java
What i want is to write a "string" that is in file A in file B if it does not already exist in file B, knowing that B is empty at the beginning 我想要的是在文件B中的文件A中写一个“字符串”,如果它不存在于文件B中,则知道B开头是空的
BufferedReader bfA=new BufferedReader(new FileReader("A.txt"));
BufferedReader bfB=new BufferedReader(new FileReader("B.txt"));
BufferedWriter writerB=new BufferedWriter(new FileWriter("B.txt"));
String line1,line2;
boolean bool=false;
while((line1=bfA.readLine())!=null){
bfB=new BufferedReader(new FileReader("B.txt"));
while((line2=bfB.readLine())!=null){
if(line1.equals(line2)){
bool=true;}}
if(bool==false){
writerB.write(line1);
}
}
the problem is that if in the File A there's duplicate string 问题是,如果文件A中有重复的字符串
Following JB Nizet's answer, here some pseudo code 遵循JB Nizet的回答,这里有一些伪代码
readerA, writerB = "", memory = ""
while(readerA.hasNextLine()){
line = readerA.nextLine()
if(line isNotPresent in memory){
add line to memory
add line in writerB
}
}
Hope this helps 希望这可以帮助
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