How to create an array in java

How to create an array in java: declare the array name to open up space and assign a value, such as [int[] arr;arr = new int[]{1,2,3, …};]. You can also specify the number of elements and then assign values ​​when declaring the array, such as [int[] arr1= new int[3];].

There are roughly three ways to create an array in Java

Explanation: Here, int is used as the data type and arr is used as the array name to demonstrate

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1. Declaration and assignment

int[] arr = {1,2,4, …};

Note that the curly braces here are not statement blocks, and after the curly braces The semicolon cannot be omitted,...it is not an element, it means you can specify multiple elements

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 Then assign 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. Above Create a multi-dimensional array based on The number of elements in the first square bracket cannot be omitted

"new data type []{}" When creating an array, the curly brackets can be omitted, but the array must be filled in "[ ]" Number

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