How to create an array in Java:
Note: Here, int is used as the data type and arr is used as the array name for demonstration.
1. Declaration and assignment
int[] arr = {1,2,4, …};
Note: The curly braces here are not statement blocks, and the semicolon after the curly braces cannot be omitted.
2. Declare the array name to open up space and assign the value
int[] arr; arr = new int[]{1,2,3, …};
3. Specify the number of elements when declaring the array and assign the value
int[] arr1= new int[3];
Note: The maximum element subscript is 2, and all element values are 0.
Assignment generally uses a for loop
4. Create a multi-dimensional array based on the above
int[][] arr = {{1,2,3},{4,5,6},{7,8,9}}; //每个子数组的个数不要求均相同 int[][] arr = new int[m][n]; //其中n可以省略 int[][][] arr = new int[m][n][q]; //同样其中n、q可以省略
Summary ：
No matter what kind of method declaration, there must be: data type [ ] such as: int [ ].
When creating a multi-dimensional array, the number of elements in the first square bracket after new cannot always be omitted.
new data type []{} where the curly braces can be omitted, but the number of arrays must be filled in [ ].
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