反转整个ArrayList或C#中指定范围内的元素顺序
要反转整个ArrayList中元素的顺序，代码如下-
示例
using System;
using System.Collections;
public class Demo {
public static void Main(String[] args) {
ArrayList list1 = new ArrayList();
list1.Add("A");
list1.Add("B");
list1.Add("C");
list1.Add("D");
list1.Add("E");
list1.Add("F");
list1.Add("G");
list1.Add("H");
list1.Add("I");
Console.WriteLine("Elements in ArrayList1...");
foreach (string res in list1) {
Console.WriteLine(res);
}
ArrayList list2 = new ArrayList();
list2.Add("A");
list2.Add("B");
list2.Add("C");
list2.Add("D");
list2.Add("E");
list2.Add("F");
list2.Add("G");
list2.Add("H");
list2.Add("I");
Console.WriteLine("Elements in ArrayList2...");
foreach (string res in list2) {
Console.WriteLine(res);
}
ArrayList list3 = new ArrayList();
Console.WriteLine("Current capacity of ArrayList3: " + list3.Capacity);
list3 = list2;
Console.WriteLine("Current capacity of ArrayList3 (Updated) " + list3.Capacity);
Console.WriteLine("Is ArrayList3 equal to ArrayList2? = "+list3.Equals(list2));
Console.WriteLine("Count of elements in ArrayList2 = " + list2.Count);
list2.Reverse();
Console.WriteLine("Elements in ArrayList2...Reversed");
foreach (string res in list2) {
Console.WriteLine(res);
}
}
}输出结果
这将产生以下输出-
Elements in ArrayList1... A B C D E F G H I Elements in ArrayList2... A B C D E F G H I Current capacity of ArrayList3: 0 Current capacity of ArrayList3 (Updated) 16 Is ArrayList3 equal to ArrayList2? = True Count of elements in ArrayList2 = 9 Elements in ArrayList2...Reversed I H G F E D C B A
示例
让我们看另一个例子-
using System;
using System.Collections;
public class Demo {
public static void Main(String[] args) {
ArrayList list = new ArrayList();
list.Add("Andy");
list.Add("Gary");
list.Add("Katie");
list.Add("Amy");
Console.WriteLine("Elements in ArrayList...");
foreach (string res in list) {
Console.WriteLine(res);
}
string[] strArr = { "John", "Jacob" };
list.AddRange(strArr);
Console.WriteLine("Elements in ArrayList...UPDATED");
foreach(String str in list) {
Console.WriteLine(str);
}
list.Reverse(1, 3);
Console.WriteLine("Elements in ArrayList2...Reversed 3 elements beginning from index 1");
foreach (string res in list) {
Console.WriteLine(res);
}
}
}输出结果
这将产生以下输出-
Elements in ArrayList... Andy Gary Katie Amy Elements in ArrayList...UPDATED Andy Gary Katie Amy John Jacob Elements in ArrayList2...Reversed 3 elements beginning from index 1 Andy Amy Katie Gary John Jacob