java对arraylist进行排序
时间: 2023-04-26 08:02:59 浏览: 63
Java中可以使用Collections.sort()方法对ArrayList进行排序,需要实现Comparable接口或者提供Comparator。
示例代码:
```
ArrayList<Integer> list = new ArrayList<>();
list.add(3);
list.add(1);
list.add(2);
Collections.sort(list);
```
相关问题
java对日期的arraylist进行排序
可以使用Java中的Collections.sort()方法来对日期的ArrayList进行排序。具体步骤如下:
1. 创建一个ArrayList来存储日期对象。
```java
ArrayList<Date> dateList = new ArrayList<Date>();
```
2. 向ArrayList中添加日期对象。
```java
dateList.add(new Date());
dateList.add(new Date(System.currentTimeMillis() - 3600 * 1000));
dateList.add(new Date(System.currentTimeMillis() + 3600 * 1000));
```
3. 使用Collections.sort()方法对ArrayList进行排序。
```java
Collections.sort(dateList);
```
完整代码示例:
```java
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
public class DateSortExample {
public static void main(String[] args) {
ArrayList<Date> dateList = new ArrayList<Date>();
dateList.add(new Date());
dateList.add(new Date(System.currentTimeMillis() - 3600 * 1000));
dateList.add(new Date(System.currentTimeMillis() + 3600 * 1000));
System.out.println("Before sorting: " + dateList);
Collections.sort(dateList);
System.out.println("After sorting: " + dateList);
}
}
```
输出结果:
```
Before sorting: [Mon Jul 05 17:05:09 CST 2021, Mon Jul 05 16:05:09 CST 2021, Mon Jul 05 18:05:09 CST 2021]
After sorting: [Mon Jul 05 16:05:09 CST 2021, Mon Jul 05 17:05:09 CST 2021, Mon Jul 05 18:05:09 CST 2021]
```
javaarraylist数组排序
要对Java ArrayList进行排序,可以使用Collections类中的sort方法。调用`Collections.sort(list)`方法可以实现升序排序。下面是一个示例代码:
```java
import java.util.ArrayList;
import java.util.Collections;
public class ArrayListTest {
public static void main(String[] args) {
ArrayList<Integer> list = new ArrayList<Integer>();
list.add(60);
list.add(20);
list.add(99);
list.add(10);
Collections.sort(list); //排序
System.out.println(list);
}
}
```
这段代码将输出排序后的ArrayList: [10, 20, 60, 99。。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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