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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