对Map中数据，按value值排序方法

//声明
Map<String,Integer> hashMap = new HashMap<String,Integer>();
//向Map中添加数据
//.....
//转换
ArrayList<Entry<String, Integer>> arrayList = new ArrayList<Entry<String, Integer>>(
hashMap.entrySet());
//排序
Collections.sort(arrayList, new Comparator<Map.Entry<String, Integer>>() {
public int compare(Map.Entry<String, Integer> map1,
Map.Entry<String, Integer> map2) {
return (map2.getValue() - map1.getValue());
}
});
//输出
for (Entry<String, Integer> entry : arrayList) {
System.out.println(entry.getKey() + "\t" + entry.getValue());
}

//声明
Map<String,Float> hashMap = new HashMap<String,Float>();
//向Map中添加数据
//.....
//转换
ArrayList<Entry<String, Float>> arrayList = new ArrayList<Map.Entry<String,Float>>(hashMap.entrySet());
//排序
Collections.sort(arrayList, new Comparator<Map.Entry<String, Float>>(){
public int compare(Map.Entry<String, Float> map1,
Map.Entry<String,Float> map2) {
return ((map2.getValue() - map1.getValue() == 0) ? 0
: (map2.getValue() - map1.getValue() > 0) ? 1
: -1);
}
});
//输出
for (Entry<String, Float> entry : arrayList) {
System.out.println(entry.getKey() + "\t" + entry.getValue());
}

//声明
Map<String,Double> hashMap = new HashMap<String,Double>();
//向Map中添加数据
//.....
//转换
ArrayList<Entry<String, Double>> arrayList = new ArrayList<Map.Entry<String,Double>>(hashMap.entrySet());
//排序
Collections.sort(arrayList, new Comparator<Map.Entry<String, Double>>(){
public int compare(Map.Entry<String, Double> map1,
Map.Entry<String,Double> map2) {
return ((map2.getValue() - map1.getValue() == 0) ? 0
: (map2.getValue() - map1.getValue() > 0) ? 1
: -1);
}
});
//输出
for (Entry<String, Double> entry : arrayList) {
System.out.println(entry.getKey() + "\t" + entry.getValue());
}