主要运用双层for循环嵌套，进行冒泡排序
public class BubbleSortTest {
public static void main(String[] args) {
int[] arr = new int[]{-12,3,2,34,5,8,1};
//冒泡排序
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]){
int temp = arr[j];
arr[j] = arr[j+1];
arr[j+1] = temp;
}
}
}
//遍历
for (int i = 0; i < arr.length; i++) {
System.out.println(arr[i]+" ");
}
}
}