Simple definition and usage example of Java two-dimensional array

This article describes the simple definition and use of Java two-dimensional array. Share with you for your reference, as follows:

Java's two-dimensional array first creates a one-dimensional array, and then the elements of the array reference another one-dimensional array. When using a two-dimensional array, use two brackets [] to access the reference of each layer of dimension until the final data is accessed.

In the above code, when instantiating a two-dimensional array, the length of the second dimension is not specified, and it is not necessary to specify it, because their lengths can be different. The length of arr.length in the above example is 3, but arr [i] The length of length is uncertain. The output results are as follows:

The length of Java array can be changed dynamically. Programmers can arbitrarily expand the dimensions of the array, and the number of elements in each dimension can be different.

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