ΠΠΎΠ΄ΡΠΊΠ°ΠΆΠΈΡΠ΅, ΠΏΠΎΡΠ΅ΠΌΡ ΠΏΠΎΠ»ΡΡΠ°Π΅ΡΡΡ Π΄Π°Π½Π½Π°Ρ ΠΎΡΠΈΠ±ΠΊΠ°. ΠΠ½Π΅ ΠΊΠ°ΠΆΠ΅ΡΡΡ, ΡΡΠΎ Π΅Ρ ΡΡΡ Π½Π΅ Π΄ΠΎΠ»ΠΆΠ½ΠΎ Π±ΡΡΡ, ΡΠ°ΠΊ ΠΊΠ°ΠΊ Ρ ΠΏΠΎΡΡΠΎΡΠ½Π½ΠΎ ΡΠΎΠ·Π΄Π°Ρ Π½ΠΎΠ²ΡΠ΅ ΠΊΠΎΠ»Π»Π΅ΠΊΡΠΈΠΈ ΠΈ Π½Π΅ ΠΌΠΎΠ΄ΠΈΡΠΈΡΠΈΡΡΡ Π² ΡΠ°Π·Π½ΠΎΠ΅ Π²ΡΠ΅ΠΌΡ ΠΎΠ΄Π½Ρ ΠΈ ΡΡ ΠΆΠ΅.
package com.javarush.task.task08.task0817;
import java.util.HashMap;
import java.util.Map;
import java.util.Iterator;
import java.util.Set;
import java.util.HashSet;
/*
ΠΠ°ΠΌ ΠΏΠΎΠ²ΡΠΎΡΡ Π½Π΅ Π½ΡΠΆΠ½Ρ
*/
public class Solution {
public static Map<String, String> createMap() {
//Π½Π°ΠΏΠΈΡΠΈΡΠ΅ ΡΡΡ Π²Π°Ρ ΠΊΠΎΠ΄
Map<String, String> persons = new HashMap<>();
persons.put("A1", "B");
persons.put("A2", "C");
persons.put("A3", "D");
persons.put("A4", "B");
persons.put("A5", "E");
persons.put("A6", "B");
persons.put("A7", "B");
persons.put("A8", "F");
persons.put("A9", "B");
persons.put("A10", "G");
return persons;
}
public static void removeTheFirstNameDuplicates(Map<String, String> map) {
//Π½Π°ΠΏΠΈΡΠΈΡΠ΅ ΡΡΡ Π²Π°Ρ ΠΊΠΎΠ΄
Map<String, String> copy = new HashMap<>(map);
Set<String> passedNames = new HashSet<>();
String currentName;
Iterator<Map.Entry<String, String>> iter = copy.entrySet().iterator();
while(iter.hasNext()) {
Map.Entry<String, String> pair = iter.next();
currentName = pair.getValue();
if (passedNames.contains(currentName)) {
removeItemFromMapByValue(copy, currentName);
}
passedNames.add(currentName);
}
}
public static void removeItemFromMapByValue(Map<String, String> map, String value) {
Map<String, String> copy = new HashMap<>(map);
for (Map.Entry<String, String> pair : copy.entrySet()) {
if (pair.getValue().equals(value)) {
map.remove(pair.getKey());
}
}
System.out.println(copy);
}
public static void main(String[] args) {
Map<String, String> map = createMap();
removeTheFirstNameDuplicates(map);
}
}
removeItemFromMapByValue
. ΠΠΎΠ»ΡΡΠ°Ρ: