How to define an integer two-dimensional array in java

1. Definition

int[][] arr2 = new int[3][3];
或
int[][] arr2 = new int[][]{{10,20,30},{40,50,60},{70,80,90}};

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The first 3 representatives This two-dimensional array is composed of three one-dimensional arrays;

The second 3 represents the number of elements in each one-dimensional array;

2. Two-dimensional array Classification

1. Regular two-dimensional array:

The number of elements of each one-dimensional array is the same

2. Irregular two-dimensional array:

The number of elements in each one-dimensional array is different

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