如何在Java中使用Comparator以降序对List进行排序
让我们首先创建一个ArrayList-
ArrayList<Integer>arrList = new ArrayList<Integer>(); arrList.add(10); arrList.add(50); arrList.add(100); arrList.add(150); arrList.add(250);
使用Comparators接口以相反的顺序排序reverseOrder()-
Comparator comparator = Collections.reverseOrder(); Now, sort with Collections: Collections.sort(arrList, comparator);
示例
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
public class Demo {
public static void main(String[] args) {
ArrayList<Integer>arrList = new ArrayList<Integer>();
arrList.add(10);
arrList.add(50);
arrList.add(100);
arrList.add(150);
arrList.add(250);
arrList.add(100);
arrList.add(150);
arrList.add(250);
Comparator comparator = Collections.reverseOrder();
System.out.println("List = "+arrList);
Collections.sort(arrList, comparator);
System.out.println("Sorted List in descending order = "+arrList);
}
}输出结果
List = [10, 50, 100, 150, 250, 100, 150, 250] Sorted List in descending order = [250, 250, 150, 150, 100, 100, 50, 10]
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