How to initialize arrays in Java

Array initialization method:

1. Static initialization

Explicitly specify the initial value of each array element during initialization , the length of the array is determined by the system.

Format:

arrayName = new type[]{element1,element2,element3...}

Example:

int[] intArr; intArr = new int[]{1,2,3,4,5,9};

2. Simplified static initialization method

Format:

type[] arrayName = {element1,element2,element3...};

Example:

String[] strArr = {"张三","李四","王二麻"};

3. Dynamic initialization

During initialization, the programmer specifies the length of the array, and the system initializes the default value of each array element.

Format:

arrayName = new type[length];

Example:

int[] price = new int[4];

Note: Do not use static initialization and dynamic initialization at the same time, that is, do not perform array initialization , not only specifies the length of the array, but also assigns an initial value to each array element. Once the array is initialized, the space occupied by the array in memory will be fixed, so the length of the array cannot be changed.

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