java – 如何将一个Map Entry添加到ArrayList？

我需要能够按值对ArrayList进行排序,以便我可以按其值排序单词.

我有两个问题：

>我不知道将映射条目添加到ArrayList的语法
>我不确定如何对ArrayList进行排序

任何帮助非常感谢！

protected void addKeywords(Status status) {
    // get tweet
    String str = status.getText();
    // split into an array remove punctuation and make lower case
    String[] splited = str.replaceAll("[^a-zA-Z ]","").toLowerCase()
            .split("s+");
    // vars used in loop
    String thisStr;
    int wordTot;
    Entry<String,Integer> newEntry = null;

    for (int i = 0; i < splited.length; i++) {
        // get word from array
        thisStr = splited[i].toLowerCase();
        thisStr = "hi";

        // if this is the first word to be added
        if (mapList.size() == 0) {
            //this is the syntax that I don't know!
            newEntry.key = theStr;
            newEntry.value = 1;
            mapList.add(newEntry);
        } else {
            boolean alreadyExists = false;
            //iterate through mapList
            for (Entry<String,Integer> entry : mapList) {
                // already exists
                if (entry.getKey() == thisStr) {
                    wordTot = entry.getValue();
                    //increment the value
                    wordTot++;
                    entry.setValue(wordTot);
                    break; 
                } 

            }
            //if we have reached here the value must not be in the arraylist so add it

            //again - this is the syntax that I don't know!
            newEntry.key = theStr;
            newEntry.value = 1;
            mapList.add(newEntry);
        }

    }

}

-EDIT – 工作代码
嗨,我添加了新的代码,将地图条目添加到ArrayList,这很有用.

我还更新了我的排序代码,这也很有效：

private void sortMap() {            
    Collections.sort(mapList,new Comparator<Map.Entry<String,Integer>>() {
          @Override
          public int compare(Map.Entry<String,Integer> o1,Map.Entry<String,Integer> o2) {
            if (o1.getValue()>o2.getValue()){
                return 1;
            }else if (o1.getValue()<o2.getValue()){
                return -1;
            }else{
                return 0;
            }
          }
        });
}