我有以下類型的列表：RepoID，Userid，事件計(jì)數(shù)（8種類型）例子：Repoid1, user1,8,1,0,2,3,4,5,9Repoid1, user2,5,6,0,0,0,4,5,9Repoid2, user1,5,0,5,2,3,4,5,1Repoid3, user4,0,6,9,2,3,4,5,2對(duì)于每個(gè)回購(gòu)，我想查找用戶的每種事件類型的計(jì)數(shù)。我正在使用hashmap的hashmap，但是由于文件太大，我不想使用2個(gè)循環(huán)。有沒(méi)有辦法在單個(gè)循環(huán)中執(zhí)行此操作或使用2個(gè)單個(gè)循環(huán)？我目前正在使用2個(gè)循環(huán)：for (int i = 0; i < data.size(); i++) { //data is an arraylist    String[] seq = data.get(i).split(",");    String repo=seq[0];    for (int j = 0; j < data.size(); j++) {        seq = data.get(j).split(",");        if(seq[0].equals(repo)){            usermap.put(seq[1],"seq[2] + "," + seq[3] + "," + seq[4] + "," + seq[5] +                 "," + seq[6]    + "," + seq[7] + "," + seq[8] + "," + seq[9]");        }     }    RepoUserMap.put(repo, EventsMap);}