Java array
Array declaration and creation
Array declaration
dataType[] arrayRefaVar;//首选
dataType arrayRefaVar[];
Create array
Use new to create array variables
dataType[] arrayRefaVar = new dataType[arraySize];
The length of the array
Using the length property of the array, each array has a length property.
Such as: get the length of the array named array
int length = array.length
Initialization of the array
Static initialization
The length of the array is not specified, the initial value is assigned at the time of declaration, and the length is automatically declared by the system
int[] array=｛1,2,3,4,5｝;
ObejcetType[] objects={
new ObjectType(2),new ObjectType(2)};
Dynamic initialization
int[] a = new int[2];
a[0]=1;
a[1]=2;
Default initialization
The array is a reference type , and its element type is equivalent to the instance variable of the class. Once space is allocated for the array, each element in it is implicitly initialized in the same way as the instance variable.