added training demo codes

Author: AdityaKshettri

.idea/.gitignore

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+My name is Aditya Kshettri.

.idea/description.html

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+My name is Aditya Kshettri.

.idea/encodings.xml

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+package com.aditya.project.training;
+
+public class Main {
+
+    public static void main(String[] args) {
+	// write your code here
+    }
+}

.idea/inspectionProfiles/Project_Default.xml

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+package com.aditya.project.training.day1.collections;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+public class ArrayListDemo {
+
+    public static void main(String[] args) {
+
+        List<Integer> data = new ArrayList<>();
+        data.add(10);
+        data.add(20);
+        data.add(10);
+        data.add(30);
+        System.out.println("ArrayList size : " + data.size());
+        System.out.println(data);
+        data.add(0, 999);
+        System.out.println("After adding at 0th index : " + data);
+        data.remove(new Integer(20));
+        System.out.println("After removing 20 by value : " + data);
+        data.remove(2);
+        System.out.println("After removing 10 by index 2 : " + data);
+
+        System.out.println("Using iterator :");
+        Iterator<Integer> iterator = data.iterator();
+        while (iterator.hasNext()) {
+            Integer integer = iterator.next();
+            System.out.println(integer);
+        }
+
+        int sum = 0;
+        iterator = data.iterator();
+        while (iterator.hasNext()) {
+            Integer integer = iterator.next();
+            sum += integer;
+        }
+        System.out.println("Sum : " + sum);
+    }
+}

.idea/libraries/mysql_connector_java_8_0_24.xml

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+package com.aditya.project.training.day1.collections;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ArrayListEmployeeDemo {
+
+    public static void main(String[] args) {
+
+        List<Employee> employees = new ArrayList<>();
+        employees.add(new Employee());
+        employees.add(new Employee(1, "Aditya", 10000));
+        employees.add(new Employee(2, "Adi", 10000));
+        employees.add(new Employee(1, "Aditya", 10000));
+
+        System.out.println(employees);
+        System.out.println(employees.size());
+
+        boolean removed = employees.remove(new Employee(1, "Aditya", 10000));
+        System.out.println(removed);
+
+        System.out.println(employees);
+        System.out.println(employees.size());
+    }
+}

.idea/misc.xml

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+package com.aditya.project.training.day1.collections;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class ConcurrentHashMapEmployeeDemo {
+
+    public static void main(String[] args) {
+
+        Map<String, Employee> employees = new ConcurrentHashMap<>();
+        employees.put("a", new Employee());
+        employees.put("b", new Employee(1, "Adi", 5000));
+        employees.put("c", new Employee(2, "Aditya", 5000));
+
+        System.out.println(employees);
+        System.out.println(employees.size());
+
+        employees.put("a", new Employee(3, "Ksh", 3000));
+
+        System.out.println("After overriding value for key 'a'");
+        System.out.println(employees);
+        System.out.println(employees.size());
+
+        System.out.println("--- USING ITERATOR ---");
+        for (Map.Entry<String, Employee> entry : employees.entrySet()) {
+            System.out.println(entry.getKey() + " : " + entry.getValue());
+        }
+
+        System.out.println("--- KEYS ---");
+        employees.keySet().forEach(System.out::println);
+
+        System.out.println("--- VALUES ---");
+        employees.values().forEach(System.out::println);
+
+        System.out.println("--- KEY-VALUE ---");
+        employees.forEach((key, value) -> System.out.println(key + " : " + value));
+
+        for (Map.Entry<String, Employee> entry : employees.entrySet()) {
+            System.out.println(entry.getKey() + " : " + entry.getValue());
+            // Both create & update possible here
+            employees.put("a", new Employee(1, "Adi", 5000));
+            employees.put("d", new Employee(1, "Adi", 5000));
+        }
+    }
+}