1 图形
2 java 冒泡排序
int[] arr = {5, 4, 3, 2, 1}; for(int i =0;i<arr.length-1;i++) {//arr.length = 5, i <= 3 for (int j = 0; j < arr.length-i-1; j++) { // j <= 3 if (arr[j] > arr[j + 1]) {// 和+1 元素比较,大于互换 int temp = arr[j]; arr[j] = arr[j + 1]; arr[j + 1] = temp; } } } for (int temp : arr){ System.out.print(temp + " "); }