Java Initialization notes

Constructor initialization
Static blocks differ from non- static blocks: The object is created with block initialization, non- static blocks are initialized only when the instance is created, andstatic blocks are initialized when the class is first loaded.

Array initialization Note points:
1. When defining an array, it is best to initialize it at the same time
2. How to define the array: int[] A; (recommend this) int a[];
3. Array initialization mode: int[] A = new int[]{1,2,3,}; the last comma is optional;
Int[] A = {one-way}; (This can only be used where the array is defined, the former may be used anywhere, such as inside a method call)
4. If no array is initialized, a run-time error is generated

Java Initialization notes