Java 中的 ConcurrentSkipListSet last()方法
原文:https://www . geeksforgeeks . org/concurrentskiplistset-last-in-method-Java/
java . util . concurrentskiplistset的 last() 方法是 Java 中的一个内置函数，它返回当前在这个集合中的最后一个(最高的)元素。
语法:
public E last()
返回值:函数返回当前在这个集合中的最后一个(最高的)元素。
异常:如果该集合为空，函数抛出 NoSuchElementException。
下面的程序说明了 ConcurrentSkipListSet.last()方法:
程序 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());
}
}
输出:
The highest element of the set: 78
程序 2: 程序在最后()显示 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);
}
}
}
输出:
Exception: java.util.NoSuchElementException
参考:https://docs . Oracle . com/javase/8/docs/API/Java/util/concurrentskiplistset . html # last–
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