java.util.concurrent.ConcurrentSkipListSet的subSet()方法是Java中的内置函数,其中元素在此方法定义的范围内返回。该函数的语法使您可以清楚地了解指定元素,并附带示例。
用法:
subSet(E fromElement, E toElement) or subSet(E fromElement, boolean fromInclusive, E toElement, boolean toInclusive)
参数:
此方法的第一个变体采用两个参数,这些参数定义了将要返回的元素的范围。 toElement不包含在返回的集中。
第二个变体与第一个变体相似,但此处的布尔参数专门包含或排除了toElement和fromElement。
返回:
第一个方法变体返回此集合部分的视图,其元素范围从fromElement(包括)到toElement(不包括)。
第二种方法变体返回此集合部分的视图,该元素的范围从boolean inclusive参数定义的fromElement到toElements。
异常:
NullPointerException :如果指定的元素为NULL。
下面是示例程序,用于说明Java中的ConcurrentSkipListSet subSet():
范例:1
返回从30000到90000的元素,但排除90000。
// Java program to demonstrate ConcurrentSkipListSet subSet() method
import java.util.concurrent.ConcurrentSkipListSet;
class ConcurrentSkipListSetExample {
public static void main(String[] args)
{
// Initializing the set using ConcurrentSkipListSet()
ConcurrentSkipListSet<Integer>
set = new ConcurrentSkipListSet<Integer>();
// Adding elements to this set
set.add(65552);
set.add(34324);
set.add(93423);
set.add(41523);
set.add(90000);
// Printing the ConcurrentSkipListSet
System.out.println("ConcurrentSkipListSet:"
+ set);
// Printing the elements of ConcurrentSkipListSet that
// are retured by subSet() method
System.out.println("The returned elements are:"
+ set.subSet(30000, 90000));
}
}
输出:
ConcurrentSkipListSet:[34324, 41523, 65552, 90000, 93423] The returned elements are:[34324, 41523, 65552]
示例:2
在此示例中,还返回了元素400,因为布尔值包含为true。
// Java program to demonstrate ConcurrentSkipListSet subSet() method
import java.util.concurrent.ConcurrentSkipListSet;
class ConcurrentSkipListSetExample {
public static void main(String[] args)
{
// Initializing the set using ConcurrentSkipListSet()
ConcurrentSkipListSet<Integer>
set = new ConcurrentSkipListSet<Integer>();
// Adding elements to this set
set.add(652);
set.add(324);
set.add(400);
set.add(123);
set.add(200);
// Printing the ConcurrentSkipListSet
System.out.println("ConcurrentSkipListSet:"
+ set);
// Printing the elements of ConcurrentSkipListSet that
// are retured by subSet() method
System.out.println("The returned elements are:"
+ set.subSet(100, true, 400, true));
}
}
输出:
ConcurrentSkipListSet:[123, 200, 324, 400, 652] The returned elements are:[123, 200, 324, 400]
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