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1. Declaration of assignment
Assignment is done when declaring.
int[] array={1,2,3,4};
2. Declare first, then create, then assign value
In fact, before assignment, the array will be assigned a default value. This value will vary depending on the data type. , will be different. For reference type arrays, null is generally assigned, such as String type arrays. For int type arrays, 0 is generally assigned, and floating point arrays are assigned 0.0. The code is as follows (the difference here That is, the array will be assigned a default value after it is created, but for local variables, there is no default value)
Note: In Java, the array subscript starts from 0 and increases until the array length is -1. The count of length starts from 1.
public class Demo { public static void main(String[] args) { int[] num=new int[5];//提升性能 int length=num.length; for(int i=0;i<length;i++) { num[i]=i+90; System.out.println(num[i]); } } }
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