My java--Array (1)

I. One-dimensional arrays

1. Definition of a single-bit array

Type arrayname[]; or type [] arrayname;

(Java does not allocate memory for array elements in the definition of arrays so [] do not indicate the number of elements in the array (that is, the array length).)

Allocating memory space for an array to use the operator new

Example: int [] score=new int [3];

(the array uses new to allocate space for each element of the array to automatically assign a default value (integer 0, real number is 0.0, the character is ' + ', the Boolean is false, the reference type is null) This is because the array is actually a reference type variable and each of its elements is a member variable of the reference type variable )

"Example" Arraytest.java using an array

public class arraytest{

public static void Main (String [] args) {

int a[]=new int [5];

for (int i=0;i<a.length;i++)

A[i]=i;

for (int i=a.length-1;i>=0;i--)

System.out.println ("a[" +i+ "]=" +a[i]);

}

}

My java--Array (1)