Java 对象内存执行分析-Array（三）

Arrays in Java store one of two things: either primitive values (int, char, ...) or references (a.k.a pointers).

Arrays 在Java 中存储二者之一： 原始数据类型（int,char,...）或者是引用（a.k.a 指针） When an object is creating by using "new", memory is allocated on the heap and a reference is returned. This is also true for arrays, since arrays are objects.

当一个对象通过使用"new"来创建，会在堆内存中分配并且返回一个引用。这也同样适用数组，因为数组是对象。

1. Single-dimension Array

int arr[] = new int[3];

The int[] arr is just the reference to the array of 3 integer. If you create an array with 10 integer, it is the same - an array is allocated and a reference is returned.

int数组arr 仅仅是三个Integer对象的数组的引用。如果你创建一个10个integer的数组，它是和一个数组相同分配在内存中，并且返回一个引用。

2. Two-dimensional Array

How about 2-dimensional array? Actually, we can only have one dimensional arrays in Java. 2D arrays are basically just one dimensional arrays of one dimensional arrays.

二维数组是如何实现的？普遍的上，在java中，我们只有一维数组。二维数组基本上仅公是一维数组中的一维数组。

int[ ][ ] arr = new int[3][ ];
arr[0] = new int[3];
arr[1] = new int[5];
arr[2] = new int[4];

Multi-dimensional arrays use the name rules.

多维数组也是相同的规则。

转载于:https://my.oschina.net/u/1273644/blog/761461