java - HashMap字典顺序java如果值相同

Question

我有以下HashMap<String,Integer>使用 Comparator 根据值按降序排序

Collections.sort(entryList, new Comparator<Map.Entry<String, Integer>>() {
@Override
public int compare(Entry<String, Integer> entry1, Entry<String, Integer> entry2) {
// TODO Auto-generated method stub
    return entry2.getValue().compareTo(entry1.getValue());
}

b=3, cococ=2, 5005=1, p=1, sees=1, k=1, dad=1, pip=1, peep=1

我现在想按字典顺序对该映射中的条目进行排序，前提是值相同(本例中为值 1)

b=3 cococ=2 5005 = 1 dad = 1 k = 1 peep = 1 p = 1 pip=1 sees=1

我该怎么做？

Answer 1

您需要使用双重标准对 map 进行排序，首先检查键是否相同，然后按键排序...

public int compare(Entry<String, Integer> entry1, Entry<String, Integer> entry2) {
    int ret = entry2.getValue().compareTo(entry1.getValue());
    if (ret == 0) {// if 0 the are the same then compare the keys
        return entry1.getKey().compareTo(entry2.getKey());
    }
    return ret;
}