import java.util.*;
import java.io.*;
class Main{
public static void main(String[] args) throws Exception{
String[] ts={"A.txt","B.txt","C.txt"};
Scanner[] ss=new Scanner[ts.length];
for(int i=0;i<ts.length;i++){
ss[i] = new Scanner(new File(ts[i]));
}
ArrayList<String> list1=new ArrayList<String>();
while(ss[0].hasNext()){
list1.add(ss[0].next());
}
ArrayList<String> list2=new ArrayList<String>();
while(ss[1].hasNext()){
String n=ss[1].next();
if(list1.contains(n)){
list2.add(n);
}
}
while(ss[2].hasNext()){
String n=ss[2].next();
if(list2.contains(n)){
list2.remove(n);
}
}
for(int i=0;i<ss.length;i++){
ss[i].close();
}
System.out.println(list2.size());
}
}
追问结果是多少
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