java二维数组字符数组_Java中的二维数组

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java二维数组字符数组

Today we will look into Two-dimensional array in java. An array is like a container that can hold a certain number of values.

今天，我们将研究Java中的二维数组。 数组就像可以容纳一定数量值的容器。

## Java中的二维数组 **(****Two Dimensional Array in Java****)** ##

Let’s look at a few examples of defining java two-dimensional array or 2d array.

让我们看一些定义Java二维数组或2d数组的示例。

### 基本类型的Java二维数组 **(****Java Two Dimensional Array of primitive type****)** ###

int[][] arr = new int[2][3];
    for (int i = 0; i < arr.length; i++) {
    	for (int j = 0; j < arr[i].length; j++) {
    		arr[i][j] = j;
    		System.out.print(arr[i][j] + " ");
    	}
    	System.out.println("");
    }

### Java二维对象数组 **(****Java Two Dimensional Array of Objects****)** ###

String[][] arrStr = new String[3][4];
    for (int i = 0; i < arrStr.length; i++) {
    	for (int j = 0; j < arrStr[i].length; j++) {
    		arrStr[i][j] = "Str" + j;
    		System.out.print(arrStr[i][j] + " ");
    	}
    	System.out.println("");
    }

So we can define a two dimensional array of primitive data types as well as objects. If you look at the above examples, two dimensional array looks like a matrix, something like below image.

因此，我们可以定义原始数据类型和对象的二维数组。 如果看上面的例子，二维数组看起来像矩阵，就像下面的图像。

However, in Java, there is no concept of a two-dimensional array. A two-dimensional [array in java][] is just an array of array. So below image correctly defines two-dimensional array structure in java.

但是，在Java中，没有二维数组的概念。 [Java中][array in java]的二维[数组][array in java]只是数组的数组。 因此，下面的图像在Java中正确定义了二维数组结构。

### Java多维数组示例 **(****Java multidimensional array example****)** ###

Now if two-dimensional array in java is an array-of-arrays, then it should also support non-symmetric sizes as shown in below image.

现在，如果java中的二维数组是一个数组数组，那么它也应该支持非对称大小，如下图所示。

Well, it’s absolutely fine in java. Below is an example program that depicts above multidimensional array.

好吧，在Java中绝对没问题。 以下是描述上述多维数组的示例程序。

public class MultidimensionalArrayExample {
    
    	public static void main(String[] args) {
    
    		// creating and initializing two dimensional array with shortcut syntax
    		int[][] arrInt = { { 1, 2 }, { 3, 4, 5 } };
    		for (int i = 0; i < arrInt.length; i++) {
    			for (int j = 0; j < arrInt[i].length; j++) {
    				System.out.print(arrInt[i][j] + " ");
    			}
    			System.out.println("");
    		}
    
    		// showing multidimensional arrays initializing
    		int[][] arrMulti = new int[2][]; // yes it's valid
    
    		arrMulti[0] = new int[2];
    		arrMulti[1] = new int[3];
    
    		arrMulti[0][0] = 1;
    		arrMulti[0][1] = 2;
    		arrMulti[1][0] = 3;
    		arrMulti[1][1] = 4;
    		arrMulti[1][2] = 5;
    		for (int i = 0; i < arrInt.length; i++) {
    			for (int j = 0; j < arrInt[i].length; j++) {
    				System.out.print(arrInt[i][j] + " ");
    			}
    			System.out.println("");
    		}
    	}
    }

If we run the above program, it will produce the following output.

如果我们运行上面的程序，它将产生以下输出。

1 2 
    3 4 5 
    1 2 
    3 4 5

That’s all about two-dimensional array in java. In a similar way, we can define a multidimensional array in java too.

这就是Java中的二维数组。 以类似的方式，我们也可以在java中定义多维数组。

Reference: [Java Array Oracle page][]

参考： [Java Array Oracle页面][Java Array Oracle page]

> 翻译自: [https://www.journaldev.com/747/two-dimensional-array-java][https_www.journaldev.com_747_two-dimensional-array-java]

java二维数组字符数组

[array in java]: https://www.journaldev.com/16851/java-array
[Java Array Oracle page]: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html
[https_www.journaldev.com_747_two-dimensional-array-java]: https://www.journaldev.com/747/two-dimensional-array-java