Java 如何对 <Integer, MyObject> 映射进行排序
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how to sort <Integer, MyObject> map
提问by grep
I have map like that:
我有这样的地图：
Map<Integer, MyEntry> map = new HashMap<Integer, MyEntry>();
MyEntry is that:
MyEntry 是这样的：
public class MyEntry {
private String title;
private String value;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
after putting values in map , I want to sort it. First element to be smallest and the last element to be biggest.
将值放入 map 后，我想对其进行排序。第一个元素最小，最后一个元素最大。
采纳答案by Jeff Storey
For sorting by key, you can use a SortedMap- one common implementation is a TreeMap. Since Integers have a natural sort order, you don't need to do anything special other than just put them into a TreeMap
对于按键排序，您可以使用 a SortedMap- 一个常见的实现是 a TreeMap。由于整数有一个自然的排序顺序，除了将它们放入一个TreeMap
If you wanted to sort by values, there are a couple of techniques described in this question Sort a Map<Key, Value> by values (Java)
如果您想按值排序，在这个问题Sort a Map<Key, Value> by values (Java) 中描述了几种技术
回答by Suresh Atta
A HashMapdoes not guarantee the order after you sorted the map. If you want sort the map by keys, use TreeMap.
AHashMap不保证排序后的顺序map。如果要按 对地图进行排序keys，请使用TreeMap。
This might helpful:Order HashMap<String,Integer> according Integer
回答by MSA
If you want to sort you can use 2 types LinkedHashMapor most used is TreeaMap .
如果你想排序，你可以使用 2 种LinkedHashMap或者最常用的是TreeaMap。
Map<Integer, MyEntry> map = new LinkedHashMap<Integer, MyEntry>();
OR
或者
Map<Integer, MyEntry> map = new TreeMap<Integer, MyEntry>();
And to add some small sample, you can use this code:
并添加一些小样本，您可以使用以下代码：
Map<Integer, String> map = new TreeMap<Integer, String>();
map.put(1, "one");
map.put(3, "three");
map.put(2, "two");
// prints one two three
for(Integer key : map.keySet()) {
System.out.println(map.get(key);
}
Some usefull:
一些有用的：
Cheers,
干杯，
