Hashmap 问题在 Java 中从文件添加字符串

Question

I have a problem adding strings into hashmap in java. My file has inside the following

On top it has comments and after that it has two number in each line. I want to remove comments or just ignore them and set each number into the hashmap only once, so i have to check for reappearance. I wrote the code below but i have problems with counting. SOMETIMES it's random. I have set a static counter "mapcounter" that is the value of the map that after every key insertion i increase by one. Here is the code:

    String line = filemap.nextLine();
    while(filemap.hasNextLine()) {

        if(!line.startsWith("#")) {
            String word[]=new String[2];
            word[0]=filemap.next();
            word[1]=filemap.next();

            if(!map.containsKey(word[0])){
                map.put(word[0],mapcounter++);
            }
            if(!map.containsKey(word[1])){
                map.put(word[1],mapcounter++);
            }
        }
        line = filemap.nextLine();
    }

Some other details. I open the file with scanner and our file pointer is "filemap". i treat the numbers as Strings ! There are the keys of the map So when i print the value of the key "30" i get correct 0 , as it is the first key to add. when i check the value of key "1412" i get a number like 500+. And i don't know why, also for key "3" i get value 6..... Any ideas??

Extra explanation: i want to keep each different Number from both columns into the hash map so i can arrange them a value. From 0 to 1,2,3,4,5,.......,1890,..... and so on. Like that 30=0, 1412=1, 3352=2, 5254=3, 5543=4,7478=5,3=6, and so on. If a key appears again i want to ignore it because already has a value. Also i want to keep and from the second column, not just the first one. That's why i have word[2] Thanks for your help

Answer 1

Base on new information provided in comments.

Given a

 Map<String, Integer> map = new HashMap<>();

You can read in two values and update the counter based on their occurrence

        int mapcounter = 0;
        String line = filemap.nextLine();
        while(filemap.hasNextLine()) {
            if(!line.startsWith("#")) {

               // split the two node column into two values.
                String[] words = line.split("\\s+");

                if(!map.containsKey(word[0])){
                    map.put(word[0],mapcounter++);
                }
                if(!map.containsKey(word[1])){
                    map.put(word[1],mapcounter++);
                }
            }
            line = filemap.nextLine();
        }

In my first answer, I totally misunderstood what you wanted. Your solution was fine except for your two next() statements. You need eliminate them and replace with a String.split to split the line into the two words. The \\\\s+ is a regular expression that splits on one or more spaces.