Following are some difference as :
| Arrays |
ArrayList |
| 1 The Arrays are created of fix size. |
1 ArrayList is of not fix size. |
| 2 The size of array cannot be incremented or decremented int [] intArray= new int[1]; intArray[2] // will give ArraysOutOfBoundException. |
2 ArrayList the size is variable. |
| 3 Once the array is created its elements cannot be added or deleted from it at runtime. | 3 ArrayList the elements can be added and deleted at
runtime. List list = new ArrayList(); list.add(1); list.add(3); list.remove(0) // will remove the element from the 1st location. |
| 4 Array can be multidimensional. int[][][] intArray= new int[1][1][1]; // 3 dimensional array |
4 ArrayList is one dimensional. |
| 5 To create an array the size should be known or initialized
to some value. |
5 ArrayList is all about dynamic creation we don’t need any
size at initialisation time. |
| 6 Array initialized without caring the memory wastage. |
6 There is no wastage of memory. |
| 7 You can not use generics on array . |
7 ArrayList can be generics to ensure type-safety. |
| 8 Array is capable to store both primitive as well as non-primitive. | 8 you cannot store primitives in ArrayList. |