Java-27, an array

• The array can be seen as a combination of a plurality of the same type of data, the unified management of these data.
• Array variable is a reference type, can also be seen as an array of objects, each element in the array corresponds to a member variable of the object.
• Elements in the array may be any type of data, including basic and reference types.

 

　　One-dimensional array declaration ways:

　　Type was []; 或 type [] was;

　　E.g:

　　int a1 [] ;  int [] a2;

　　double  b [];

　　Person [] p1;

　　String s1 [];

　　Java language does not specify the length declared in the array, for example:

　　int a [5]; // illicit

 

Creating an array of objects

Java keyword used to create an array of new objects in the format: 　　　　Array name = [number of array elements] The new type of array elements E.g

package com.nyist; public class TestArray { public static void main(String[] args) { int[] s; s = new int[5]; for(int i=0;i<5;i++) { s[i]=2*i+1; } } }

 

 

 

 

 

 

 

 

 

 

 

 

ps: In addition to the basic types, all other reference types in Java (reference types are additionally allocated space)