我对Java比较陌生,经常发现需要对值进行Map<Key,Value>排序。
由于这些值不是唯一的,我发现自己将keySet转换为一个数组,并使用自定义比较器通过数组排序对该数组进行排序,该比较器根据与该键关联的值进行排序。
有没有更简单的方法?
我对Java比较陌生,经常发现需要对值进行Map<Key,Value>排序。
由于这些值不是唯一的,我发现自己将keySet转换为一个数组,并使用自定义比较器通过数组排序对该数组进行排序,该比较器根据与该键关联的值进行排序。
有没有更简单的方法?
当前回答
对于Java 8,您可以使用streams api以一种明显不那么冗长的方式来实现:
Map<K, V> sortedMap = map.entrySet().stream()
.sorted(Entry.comparingByValue())
.collect(Collectors.toMap(Entry::getKey, Entry::getValue, (e1, e2) -> e1, LinkedHashMap::new));
其他回答
static <K extends Comparable<? super K>, V extends Comparable<? super V>>
Map sortByValueInDescendingOrder(final Map<K, V> map) {
Map re = new TreeMap(new Comparator<K>() {
@Override
public int compare(K o1, K o2) {
if (map.get(o1) == null || map.get(o2) == null) {
return -o1.compareTo(o2);
}
int result = -map.get(o1).compareTo(map.get(o2));
if (result != 0) {
return result;
}
return -o1.compareTo(o2);
}
});
re.putAll(map);
return re;
}
@Test(timeout = 3000l, expected = Test.None.class)
public void testSortByValueInDescendingOrder() {
char[] arr = "googler".toCharArray();
Map<Character, Integer> charToTimes = new HashMap();
for (int i = 0; i < arr.length; i++) {
Integer times = charToTimes.get(arr[i]);
charToTimes.put(arr[i], times == null ? 1 : times + 1);
}
Map sortedByTimes = sortByValueInDescendingOrder(charToTimes);
Assert.assertEquals(charToTimes.toString(), "{g=2, e=1, r=1, o=2, l=1}");
Assert.assertEquals(sortedByTimes.toString(), "{o=2, g=2, r=1, l=1, e=1}");
Assert.assertEquals(sortedByTimes.containsKey('a'), false);
Assert.assertEquals(sortedByTimes.get('a'), null);
Assert.assertEquals(sortedByTimes.get('g'), 2);
Assert.assertEquals(sortedByTimes.equals(charToTimes), true);
}
Java 8提供了一个新的答案:将条目转换为流,并使用Map中的比较器组合符。条目:
Stream<Map.Entry<K,V>> sorted =
map.entrySet().stream()
.sorted(Map.Entry.comparingByValue());
这将允许您使用按值升序排序的条目。如果您想要递减值,只需反转比较器:
Stream<Map.Entry<K,V>> sorted =
map.entrySet().stream()
.sorted(Collections.reverseOrder(Map.Entry.comparingByValue()));
如果这些值不可比较,则可以传递显式比较器:
Stream<Map.Entry<K,V>> sorted =
map.entrySet().stream()
.sorted(Map.Entry.comparingByValue(comparator));
然后,您可以继续使用其他流操作来使用数据。例如,如果要在新地图中显示前10名:
Map<K,V> topTen =
map.entrySet().stream()
.sorted(Map.Entry.comparingByValue(Comparator.reverseOrder()))
.limit(10)
.collect(Collectors.toMap(
Map.Entry::getKey, Map.Entry::getValue, (e1, e2) -> e1, LinkedHashMap::new));
上面看到的LinkedHashMap按插入顺序迭代条目。
或打印到System.out:
map.entrySet().stream()
.sorted(Map.Entry.comparingByValue())
.forEach(System.out::println);
使用java.util.TreeMap。
映射根据其键的自然顺序进行排序,或由创建映射时提供的Comparator进行排序,具体取决于使用的构造函数
HashMap<String,Long>的最简单的暴力排序HashMap方法:您可以复制粘贴它,然后这样使用:
public class Test {
public static void main(String[] args) {
HashMap<String, Long> hashMap = new HashMap<>();
hashMap.put("Cat", (long) 4);
hashMap.put("Human", (long) 2);
hashMap.put("Dog", (long) 4);
hashMap.put("Fish", (long) 0);
hashMap.put("Tree", (long) 1);
hashMap.put("Three-legged-human", (long) 3);
hashMap.put("Monkey", (long) 2);
System.out.println(hashMap); //{Human=2, Cat=4, Three-legged-human=3, Monkey=2, Fish=0, Tree=1, Dog=4}
System.out.println(sortHashMap(hashMap)); //{Cat=4, Dog=4, Three-legged-human=3, Human=2, Monkey=2, Tree=1, Fish=0}
}
public LinkedHashMap<String, Long> sortHashMap(HashMap<String, Long> unsortedMap) {
LinkedHashMap<String, Long> result = new LinkedHashMap<>();
//add String keys to an array: the array would get sorted, based on those keys' values
ArrayList<String> sortedKeys = new ArrayList<>();
for (String key: unsortedMap.keySet()) {
sortedKeys.add(key);
}
//sort the ArrayList<String> of keys
for (int i=0; i<unsortedMap.size(); i++) {
for (int j=1; j<sortedKeys.size(); j++) {
if (unsortedMap.get(sortedKeys.get(j)) > unsortedMap.get(sortedKeys.get(j-1))) {
String temp = sortedKeys.get(j);
sortedKeys.set(j, sortedKeys.get(j-1));
sortedKeys.set(j-1, temp);
}
}
}
// construct the result Map
for (String key: sortedKeys) {
result.put(key, unsortedMap.get(key));
}
return result;
}
}
当你有两个相等的项目时,投票给最多的答案不起作用。TreeMap保留相等的值。
示例:未排序地图
key/value: D/67.3 key/value: A/99.5 key/value: B/67.4 key/value: C/67.5 key/value: E/99.5
后果
key/value: A/99.5 key/value: C/67.5 key/value: B/67.4 key/value: D/67.3
所以省略了E!!
对我来说,它可以很好地调整比较器,如果它等于,则不返回0,而是返回-1。
在示例中:
类ValueComparator实现Comparator{地图库;公共ValueComparator(地图库){this.base=基数;}public int compare(对象a,对象b){如果((双)base.get(a)<(双)base.get(b)){返回1;}否则如果((双)base.get(a)==(双)base.get(b)){返回-1;}其他{返回-1;}}}
现在它返回:
未排序地图:
key/value: D/67.3 key/value: A/99.5 key/value: B/67.4 key/value: C/67.5 key/value: E/99.5
结果:
key/value: A/99.5 key/value: E/99.5 key/value: C/67.5 key/value: B/67.4 key/value: D/67.3
作为对《外国人》的回应(2011年11月22日):我将此解决方案用于整数Id和名称的映射,但想法是相同的,因此上面的代码可能不正确(我将在测试中编写并给您正确的代码),这是基于上面解决方案的map排序代码:
package nl.iamit.util;
import java.util.Comparator;
import java.util.Map;
public class Comparators {
public static class MapIntegerStringComparator implements Comparator {
Map<Integer, String> base;
public MapIntegerStringComparator(Map<Integer, String> base) {
this.base = base;
}
public int compare(Object a, Object b) {
int compare = ((String) base.get(a))
.compareTo((String) base.get(b));
if (compare == 0) {
return -1;
}
return compare;
}
}
}
这是测试类(我刚刚测试了它,这适用于Integer,StringMap:
package test.nl.iamit.util;
import java.util.HashMap;
import java.util.TreeMap;
import nl.iamit.util.Comparators;
import org.junit.Test;
import static org.junit.Assert.assertArrayEquals;
public class TestComparators {
@Test
public void testMapIntegerStringComparator(){
HashMap<Integer, String> unSoretedMap = new HashMap<Integer, String>();
Comparators.MapIntegerStringComparator bvc = new Comparators.MapIntegerStringComparator(
unSoretedMap);
TreeMap<Integer, String> sorted_map = new TreeMap<Integer, String>(bvc);
//the testdata:
unSoretedMap.put(new Integer(1), "E");
unSoretedMap.put(new Integer(2), "A");
unSoretedMap.put(new Integer(3), "E");
unSoretedMap.put(new Integer(4), "B");
unSoretedMap.put(new Integer(5), "F");
sorted_map.putAll(unSoretedMap);
Object[] targetKeys={new Integer(2),new Integer(4),new Integer(3),new Integer(1),new Integer(5) };
Object[] currecntKeys=sorted_map.keySet().toArray();
assertArrayEquals(targetKeys,currecntKeys);
}
}
以下是地图比较器的代码:
public static class MapStringDoubleComparator implements Comparator {
Map<String, Double> base;
public MapStringDoubleComparator(Map<String, Double> base) {
this.base = base;
}
//note if you want decending in stead of ascending, turn around 1 and -1
public int compare(Object a, Object b) {
if ((Double) base.get(a) == (Double) base.get(b)) {
return 0;
} else if((Double) base.get(a) < (Double) base.get(b)) {
return -1;
}else{
return 1;
}
}
}
这是一个测试用例:
@Test
public void testMapStringDoubleComparator(){
HashMap<String, Double> unSoretedMap = new HashMap<String, Double>();
Comparators.MapStringDoubleComparator bvc = new Comparators.MapStringDoubleComparator(
unSoretedMap);
TreeMap<String, Double> sorted_map = new TreeMap<String, Double>(bvc);
//the testdata:
unSoretedMap.put("D",new Double(67.3));
unSoretedMap.put("A",new Double(99.5));
unSoretedMap.put("B",new Double(67.4));
unSoretedMap.put("C",new Double(67.5));
unSoretedMap.put("E",new Double(99.5));
sorted_map.putAll(unSoretedMap);
Object[] targetKeys={"D","B","C","E","A"};
Object[] currecntKeys=sorted_map.keySet().toArray();
assertArrayEquals(targetKeys,currecntKeys);
}
当然,你可以让它更通用,但我只需要一个案例(地图)