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978天前import java.util.ArrayList; |
import java.util.Collections; |
import java.util.Comparator; |
import java.util.HashMap; |
import java.util.Iterator; |
import java.util.List; |
import java.util.Map.Entry; |
import java.util.Scanner; |
public class StringChat { |
public static void main(String[] args) { |
|
Scanner sc = new Scanner(System.in); |
String s = sc.nextLine(); |
sc.close(); |
HashMap<Character, Integer> hashmap = new HashMap<Character, Integer>(); |
for (int i = 0; i < s.length(); i++) { |
if (hashmap.containsKey(s.charAt(i))) { |
hashmap.put(s.charAt(i), hashmap.get(s.charAt(i)) + 1); |
} else { |
hashmap.put(s.charAt(i), 1); |
} |
} |
Iterator<?> iter = hashmap.entrySet().iterator(); |
while (iter.hasNext()) { |
@SuppressWarnings("unchecked") |
Entry<Character, Integer> next = (Entry<Character, Integer>)iter.next(); |
Entry<Character, Integer> entry = next; |
Character c = (Character) entry.getKey(); |
Integer n = (Integer) entry.getValue(); |
System.out.println(c + " : " + n); |
} |
List<Entry<Character, Integer>> list = new ArrayList<Entry<Character, Integer>>(hashmap.entrySet()); |
Collections.sort(list, new Comparator<Entry<Character, Integer>>() { |
@Override |
public int compare(Entry<Character, Integer> o1, Entry<Character, Integer> o2) { |
return o1.getValue() - o2.getValue(); |
} |
}); |
StringBuilder strBuilder = new StringBuilder(); |
for (int i = 0; i < list.size(); i++) |
for (int j = 0; j < list.get(i).getValue(); j++) |
strBuilder.append(list.get(i).getKey()); |
System.out.println(strBuilder.toString()); |
} |
|
} |
