Java Arrays class usage example analysis

1.toString method

Outputs the array as a string according to the default format.

public static void main(String[] args) {
    int dataA[] = new int[] {1,2,5,4,3};
    System.out.println(Arrays.toString(dataA));
}

2.sort method

Sort the array in ascending order.

Note

Parameter array analysis

(1) is a numerical value, the default is ascending order

(2) is a string (English) in ascending alphabetical order Sorting

(3) It is a string (Chinese) sorted in ascending order according to the encoding number of the string

(4) If it is a custom type, then the custom class must have a comparable or Comparator interface Support

int[] intTest={15,78,32,5,29,22,17,34};
Arrays.sort(intTest);
output(intTest);

3.equals

Compares whether array elements are equal.

int []arr1 = {1,2,3};
int []arr2 = {1,2,3};
System.out.println(Arrays.equals(arr1,arr2));

Note: If the element values ​​of two arrays are the same, but the corresponding position elements of the two arrays are different, the return result of Arrays.equals is false.

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