ArrayList lesson & examples added

Author: halilozel1903

src/ArrayList.kt

@@ -0,0 +1,78 @@
+fun main() {
+
+    /*
+
+    ArrayList class is used to create a dynamic array.
+    Which means the size of ArrayList class can be increased or decreased according to requirement.
+    ArrayList class provides both read and write functionalities.
+
+    ArrayList class follows the sequence of insertion order.
+    ArrayList class is non synchronized and it may contains duplicate elements.
+    The elements of ArrayList class are accessed randomly as it works on index basis.
+
+     */
+
+    val arrayList = ArrayList<String>() // Creating an empty arraylist
+    arrayList.add("Kotlin")
+    arrayList.add("Java")
+    arrayList.add("Swift")
+    arrayList.add("Objective-C")
+
+    // print ArrayList elements
+    for (language in arrayList) {
+
+        println("Mobile Programming Language : $language")
+    }
+
+
+    // Let's create an ArrayList class with initialize its initial capacity.
+    // The capacity of ArrayList class is not fixed and it can be change later in program according to requirement.
+    val ageList = ArrayList<Int>(3)
+    ageList.add(12) // Adding object in ageList
+    ageList.add(21)
+    ageList.add(33)
+
+    for (age in ageList) {
+
+        println("Age : " + age)
+    }
+
+
+    // arrayList size
+    println("size of ageList : ${ageList.size}")
+
+
+    // The get() function of ArrayList class is used to retrieve the element present at given specified index.
+    println("ageList.get(1) : ${ageList.get(1)}")
+
+
+    // The set() function of ArrayList class is used to set the given element at specified index and replace
+    // if any element present at specified index.
+    ageList.set(0, 45)
+
+
+    // The indexOf() function of ArrayList class is used to retrieve the index value of first occurrence of element or
+    // return -1 if the specified element in not present in the list.
+    println(ageList.indexOf(45))
+
+
+    // new element add
+    ageList.add(45)
+
+    // The lastIndexOf() function of ArrayList class is used to retrieve the index value of last occurrence of
+    // element or return -1 if the specified element in not present in the list.
+    println(ageList.lastIndexOf(45))
+
+
+    // The remove () function of ArrayList class is used to remove the first occurrence of element if it is
+    // present in the list.
+    ageList.remove(12)
+
+
+    // The removeAt() function of ArrayList class is used to remove the element of specified index from the list.
+    ageList.removeAt(2)
+
+
+    // The clear() function of ArrayList class is used to remove (clear) all the elements of list.
+    ageList.clear()
+}