如何在 Java 中对 ArrayList 进行升序排序
java 8object oriented programmingprogramming更新于 2025/6/26 21:22:17
要对 ArrayList 进行升序排序，最简单的方法是使用 Collections.sort() 方法。使用此方法，您只需将 ArrayList 设置为参数，如下所示 −
Collections.sort(ArrayList)
现在让我们看一个对 ArrayList 进行升序排序的示例。这里，我们使用整数元素对 ArrayList 进行排序 −
示例
import java.util.ArrayList;
import java.util.Collections;
public class Demo {
public static void main(String args[]) {
ArrayList<Integer> myList = new ArrayList<Integer>();
myList.add(50);
myList.add(29);
myList.add(35);
myList.add(11);
myList.add(78);
myList.add(64);
myList.add(89);
myList.add(67);
System.out.println("Points
"+ myList);
Collections.sort(myList);
System.out.println("Points (ascending order)
"+ myList);
}
}
输出
Points [50, 29, 35, 11, 78, 64, 89, 67] Points (ascending) [11, 29, 35, 50, 64, 67, 78, 89]
以下是另一段在 Java 中按升序对 ArrayList 进行排序的代码。这里，我们使用字符串值对 ArrayList 进行排序 −
示例
import java.util.ArrayList;
import java.util.Collections;
public class Demo {
public static void main(String args[]) {
ArrayList<String> myList = new ArrayList<String>();
myList.add("Tim");
myList.add("John");
myList.add("Steve");
myList.add("Andy");
myList.add("Devillers");
myList.add("Jacob");
myList.add("Franco");
myList.add("Amy");
System.out.println("Student Names
"+ myList);
Collections.sort(myList);
System.out.println("Student Names (ascending)
"+ myList);
}
}
输出
Student Names [Tim, John, Steve, Andy, Devillers, Jacob, Franco, Amy] Student Names (ascending) [Amy, Andy, Devillers, Franco, Jacob, John, Steve, Tim]
