Homework3

src/main/java/homework3/Task1.java

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+package homework3;
+
+import java.util.*;
+
+public class Task1 {
+    public static void main(String[] args) {
+        String[] strArr = {"q", "w", "e", "r", "t", "y", "q", "w", "e", "q", "w", "q", "z"};
+        mapEx(strArr);
+    }
+
+    private static void mapEx(String[] str) {
+        Map<String, Integer> map = new HashMap();
+
+        for (int i = 0; i < str.length; i++) {
+            if (!map.containsKey(str[i])) {
+                map.put(str[i], 0); // инициализируем key-строки в map со назначим value = 0
+                //System.out.println(str[i] + " " + map.get(str[i]));
+            }
+            map.put(str[i], map.get(str[i]) + 1); // и для key-строк с value = 0 назначим value = 1; далее, если key-строка втретится еще раз, увеличим для нее счетчик
+            //System.out.println(str[i] + " " + map.get(str[i]));
+        }
+
+        for (Map.Entry<String, Integer> entry : map.entrySet()) {
+            System.out.println(entry.getKey() + " " + entry.getValue());
+        }
+    }
+}

src/main/java/homework3/Task2.java

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+package homework3;
+
+import java.util.*;
+
+public class Task2 {
+    public static void main(String[] args) {
+        Phonebook.add("Смирнов", "+799912345");
+        Phonebook.add("Смирнов", "+7999123451111");
+        Phonebook.add("Смирнов", "+799954321");
+        Phonebook.add("Сидоров", "+766666666");
+        Phonebook.add("Иванов", "+7111111111");
+
+        String s = Phonebook.get(Phonebook.map, "Смирнов");
+
+        System.out.println(s.substring(2));
+    }
+
+    public static class Phonebook {
+        private static final Map<String, String> map = new HashMap<>();
+
+        public static void add(String lastName, String phoneNumber) {
+            if (!map.containsKey(lastName))
+                map.put(lastName, "");
+            map.put(lastName, map.get(lastName) + "; " + phoneNumber);
+        }
+
+        public static String get(Map map, String lastName) {
+            return (String) map.get(lastName);
+        }
+    }
+}