如何使用Java NavigableSet类的headSet()方法
该headset()方法返回的元素达到定义为参数的限制。
首先，创建一个NavigableSet并添加元素-
NavigableSet<Integer> set = new TreeSet<>(); set.add(10); set.add(25); set.add(40); set.add(55); set.add(70); set.add(85); set.add(100);
现在，使用headset()方法-
set.headSet(55));
以下是一个例子-
示例
import java.util.NavigableSet;
import java.util.TreeSet;
public class Demo {
public static void main(String[] args) {
NavigableSet<Integer> set = new TreeSet<>();
set.add(10);
set.add(25);
set.add(40);
set.add(55);
set.add(70);
set.add(85);
set.add(100);
System.out.println("Returned Value = " + set.headSet(55));
System.out.println("Returned Value (high endpoint included) = " + set.headSet(55, true));
}
}输出结果
Returned Value = [10, 25, 40] Returned Value (high endpoint included) = [10, 25, 40, 55]