1.升序排列
public static void main(String[] args) {
int[] arr = {9,21,34,1,17};
for(int i = 0; i< arr.length - 1; i++) {
for(int j = 0;j< arr.length - i -1;j++) {
if(arr[j] > arr[j+1]) {
int temp = arr[j];
arr[j] = arr[j+1];
arr[j+1] = temp;
}
}
}
for (int i : arr) {
System.out.print(i + " ");
}
}
2.降序排列(就是把if当中的判断改为”<”)
public static void main(String[] args) {
int[] arr = {9,21,34,1,17};
for(int i = 0; i< arr.length - 1; i++) {
for(int j = 0;j< arr.length - i -1;j++) {
if(arr[j] < arr[j+1]) {
int temp = arr[j];
arr[j] = arr[j+1];
arr[j+1] = temp;
}
}
}
for (int i : arr) {
System.out.print(i + " ");
}
}