Java ConcurrentSkipListSet isEmpty()方法
java.util.concurrent.ConcurrentSkipListSet.isEmpty()方法是Java中的一个内置函数,用于检查该集合是否为空。
语法
ConcurrentSkipListSet.isEmpty()
参数: 该函数不接受任何参数。
返回值: 该函数返回一个布尔值。如果ConcurrentSkipListSet是空的,返回true,否则返回false。
下面的程序说明了ConcurrentSkipListSet.IsEmpty()方法。
程序1: 在这个程序中,ConcurrentSkipListSet是不空的。
// Java Program to demonstrate isEmpty()
// method of ConcurrentSkipListSet()
import java.util.concurrent.*;
class ConcurrentSkipListSetIsEmptyExample1 {
public static void main(String[] args)
{
// Creating a set object
ConcurrentSkipListSet<Integer> Lset =
new ConcurrentSkipListSet<Integer>();
// Adding elements to this set
for (int i = 10; i <= 50; i += 10)
Lset.add(i);
// Checks if this set is empty or not
if (Lset.isEmpty())
System.out.println("The set is empty.");
else
System.out.println("The set is non-empty.");
}
}
输出。
The set is non-empty.
程序2: 在这个程序中,ConcurrentSkipListSet是空的。
// Java program to demonstrate isEmpty()
// method of ConcurrentSkipListSet()
import java.util.concurrent.*;
class ConcurrentSkipListSetIsEmptyExample2 {
public static void main(String[] args)
{
// Creating a set object
ConcurrentSkipListSet<Integer> Lset =
new ConcurrentSkipListSet<Integer>();
// Checks if this set is empty or not
if (Lset.isEmpty())
System.out.println("The set is empty.");
else
System.out.println("The set is non-empty.");
}
}
输出。
The set is empty.
参考资料 : https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#add(E)