Java中的ConcurrentSkipListSet isEmpty()方法

爪哇。util。同时发生的ConcurrentSkipListSet。isEmpty()方法是Java中的一个内置函数,用于检查此集合是否为空。

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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为空,则返回true,否则返回false。

下面的程序演示了ConcurrentSkipListSet。IsEmpty()方法:

项目1: 在这个程序中,ConcurrentSkipListSet是非空的。

// 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.

项目2: 在此程序中,ConcurrentSkipListSet为空。

// 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: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#add(E)

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