数组常见操作【排序】

public class day_5 {
    public static void main(String[] args) {
        /*排序*/
        //选择排序
        int[] arr = {1, 2, 3, 5, 4};
        //排序前
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i]);
        }
        System.out.println();
        for (int i = 0; i < arr.length - 1; i++) {
            for (int j = i + 1; j < arr.length; j++) {
                if (arr[i] < arr[j]) {
                    int temp = arr[i];
                    arr[i] = arr[j];
                    arr[j] = temp;
                }
            }
        }
        //排序后
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i]);
        }
        System.out.println();

        //冒泡排序
        int[] arr1 = {1, 3, 2, 4, 5};
        for (int i = 0; i < arr1.length - 1; i++) {
            for (int j = 0; j < arr1.length - 1 - i; j++) {   //arr1.length - 1 - i和arr1.length -1一样效果
                if (arr1[j] < arr1[j + 1]) {
                    int temp = arr1[j];
                    arr1[j] = arr1[j + 1];
                    arr1[j + 1] = temp;
                }
            }
        }
        //排序后
        for (int i = 0; i < arr1.length; i++) {
            System.out.print(arr1[i]);
        }
    }
}