升序&降序：
public static void main(String[] args) {
float[] arr = {2.1F, 15.34F, 41.22F, 67F, 29.33F, 38.7F,12,3,1};
System.out.println("开始咯");
for (float item : arr) {
System.out.print(item + "\t");
}
System.out.println();
for (int i = 0; i < arr.length - 1; i++) {
for (int j = 0; j < arr.length - 1 - i; j++) {
if (arr[j] > arr[j + 1]) {
float temp = arr[j];
arr[j] = arr[j + 1];
arr[j + 1] = temp;
}
}
}
System.out.println("倒序");
for (float value : arr) {
System.out.print(value + "\t");
}
System.out.println();
for (int i = 0; i < arr.length - 1; i++) {
for (int j = 0; j < arr.length - 1 - i; j++) {
if (arr[j] < arr[j + 1]) {
float temp = arr[j];
arr[j] = arr[j + 1];
arr[j + 1] = temp;
}
}
}
System.out.println("正序");
for (float value : arr) {
System.out.print(value + "\t");
}
System.out.println("结束啦");
}