将整数1-100存入一个List集合中并输出
你可以使用以下代码将1-100之间的数字存入List集合中：
然后可以使用以下代码来翻转40-60的元素：
Collections.reverse(list.subList(39,61));
System.out.println(list);
```c
List<Integer> list = new ArrayList<>();
for(int i=1;i<=100;i++){
list.add(i);
}
System.out.println(list);
```
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class Test {
public static void main(String[] args) {
List list=new ArrayList();
for (int i = 1; i <=100; i++) {
list.add(i);
}
System.out.println("翻转前:");
System.out.println(list);
Collections.reverse(list.subList(39, 60));
System.out.println("翻转后:");
System.out.println(list);
}
}
代码
import java.util.ArrayList;
import java.util.List;
public class Temp {
public static void main(String[] args) {
List<Integer> list = new ArrayList<>();
for (int i = 1; i < 101; i++) {
list.add(i);
}
System.out.println("初始集合：" + list);
// 翻转 第40到第60
bubbleSort(list, 39, 59, false);
System.out.println("最终集合：" + list);
}
public static void bubbleSort(List<Integer> list, int startIndex, int endIndex, boolean orderAsc) {
int temp = 0;
if (orderAsc) {
for (int i = startIndex; i < endIndex; i++) {
for (int j = startIndex; j < endIndex + startIndex - i; j++) {
if (list.get(j) > list.get(j + 1)) {
temp = list.get(j);
list.set(j, list.get(j + 1));
list.set(j + 1, temp);
}
}
}
} else {
for (int i = startIndex; i < endIndex; i++) {
for (int j = startIndex; j < endIndex + startIndex - i; j++) {
if (list.get(j) < list.get(j + 1)) {
temp = list.get(j);
list.set(j, list.get(j + 1));
list.set(j + 1, temp);
}
}
}
}
}
}
结果
初始集合：[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]
最终集合：[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]