Arraylist implementation

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Similar question:

  •  dynamic array implementation
  •  custom arraylist implementation
  •  own arraylist implementation


  1. class MyArray<E> {
  2. static int length = 0;
  3. static int capacity = 10;
  4. static Object arr[];
  5. MyArray(){
  6.  arr = new Object[capacity];
  7. }
  8. public void add(E value) {
  9. if (capacity == length) {
  10. increaseCapacity();
  11. }
  12. arr[length] = value;
  13. length++;
  14. }

  16. public static void increaseCapacity() {
  17. capacity=capacity*2;
  18. arr=Arrays.copyOf(arr, capacity);
  19. }

  21. public static int size() {
  22. return length;
  23. }
  24. public E get(int index) {
  25. if(index>length){
  26. throw new ArrayIndexOutOfBoundsException();
  27. }
  28. else return (E) arr[index];
  29. }
  30. public boolean contain(E value) {
  31. for(int i=0;i<length;i++){
  32. if(arr[i]==value)
  33. return true;
  34. }
  35. return false;
  36. }
  37. }


Test




  1. public class Array1 {
  2. public static void main(String[] args) {
  3. MyArray m2=new MyArray();
  4. m2.add(1);
  5. m2.add("2");
  6. for (int i = 0; i < m2.length; i++) {
  7. System.out.println(m2.get(i));
  8. }
  9. }
  10. }


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