Java ConcurrentSkipListSet last()用法及代碼示例

java.util.concurrent.ConcurrentSkipListSet的last()方法是Java中的一個內置函數，它返回當前該集中的最後一個(最高)元素。

用法:

public E last()

返回值：該函數返回返回當前在此集合中的最後一個(最高)元素。

異常：如果此集合為空，則該函數將引發NoSuchElementException。

以下示例程序旨在說明ConcurrentSkipListSet.last()方法：

示例1:

// Java program to demonstrate last() 
// method of ConcurrentSkipListSet 
  
import java.util.concurrent.ConcurrentSkipListSet; 
  
class ConcurrentSkipListSetLastExample1 { 
    public static void main(String[] args) 
    { 
  
        // Initializing the set 
        ConcurrentSkipListSet<Integer> 
            set = new ConcurrentSkipListSet<Integer>(); 
  
        // Adding elements to this set 
        set.add(78); 
        set.add(64); 
        set.add(12); 
        set.add(45); 
        set.add(8); 
  
        // Printing the highest element of the set 
        System.out.println("The highest element of the set: "
                           + set.last()); 
    } 
}

輸出：

The highest element of the set: 78

示例2:程序以在last()中顯示NoSuchElementException。

// Java program to demonstrate last() 
// method of ConcurrentSkipListSet 
  
import java.util.concurrent.ConcurrentSkipListSet; 
  
class ConcurrentSkipListSetLastExample1 { 
    public static void main(String[] args) 
    { 
  
        // Initializing the set 
        ConcurrentSkipListSet<Integer> 
            set = new ConcurrentSkipListSet<Integer>(); 
        try { 
            // Printing the highest element of the set 
            System.out.println("The highest element of the set: "
                               + set.last()); 
        } 
        catch (Exception e) { 
            System.out.println("Exception: " + e); 
        } 
    } 
}

輸出：

Exception: java.util.NoSuchElementException

參考：https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#last–

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注：本文由純淨天空篩選整理自rupesh_rao大神的英文原創作品 ConcurrentSkipListSet last() method in Java。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。