ArrayList クラスとは? わかりやすく解説

ArrayList クラス

必要に応じてサイズ動的に増加する配列使用して、IList インターフェイス実装ます。

名前空間: System.Collections
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Class ArrayList
    Implements IList, ICollection, IEnumerable, ICloneable
[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public class ArrayList : IList, ICollection,
 IEnumerable, 
    ICloneable
[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public ref class ArrayList : IList, ICollection,
 IEnumerable, 
    ICloneable
/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public class ArrayList implements IList, ICollection,
 
    IEnumerable, ICloneable
SerializableAttribute 
ComVisibleAttribute(true) 
public class ArrayList implements IList, ICollection,
 
    IEnumerable, ICloneable
解説解説
使用例使用例

ArrayList作成および初期化する方法と、その値を出力する方法次のコード例示します

Imports System
Imports System.Collections
Imports Microsoft.VisualBasic

Public Class SamplesArrayList    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a new ArrayList.
        Dim myAL As New
 ArrayList()
        myAL.Add("Hello")
        myAL.Add("World")
        myAL.Add("!")
        
        ' Displays the properties and values of the ArrayList.
        Console.WriteLine("myAL")
        Console.WriteLine("    Count:    {0}", myAL.Count)
        Console.WriteLine("    Capacity: {0}", myAL.Capacity)
        Console.Write("    Values:")
        PrintValues(myAL)
    End Sub

    Public Shared Sub PrintValues(myList
 As IEnumerable)
        Dim obj As [Object]
        For Each obj In
  myList
            Console.Write("   {0}", obj)
        Next obj
        Console.WriteLine()
    End Sub 'PrintValues

End Class


' This code produces output similar to the following:
' 
' myAL
'     Count:    3
'     Capacity: 4
'     Values:   Hello   World   !

using System;
using System.Collections;
public class SamplesArrayList  {

   public static void Main()
  {

      // Creates and initializes a new ArrayList.
      ArrayList myAL = new ArrayList();
      myAL.Add("Hello");
      myAL.Add("World");
      myAL.Add("!");

      // Displays the properties and values of the ArrayList.
      Console.WriteLine( "myAL" );
      Console.WriteLine( "    Count:    {0}", myAL.Count );
      Console.WriteLine( "    Capacity: {0}", myAL.Capacity );
      Console.Write( "    Values:" );
      PrintValues( myAL );
   }

   public static void PrintValues(
 IEnumerable myList )  {
      foreach ( Object obj in myList )
         Console.Write( "   {0}", obj );
      Console.WriteLine();
   }

}


/* 
This code produces output similar to the following:

myAL
    Count:    3
    Capacity: f
    Values:   Hello   World   !

*/
using namespace System;
using namespace System::Collections;
void PrintValues( IEnumerable^ myList );
int main()
{
   
   // Creates and initializes a new ArrayList.
   ArrayList^ myAL = gcnew ArrayList;
   myAL->Add( "Hello" );
   myAL->Add( "World" );
   myAL->Add( "!" );
   
   // Displays the properties and values of the ArrayList.
   Console::WriteLine( "myAL" );
   Console::WriteLine( "    Count:    {0}", myAL->Count );
   Console::WriteLine( "    Capacity: {0}", myAL->Capacity );
   Console::Write( "    Values:" );
   PrintValues( myAL );
}

void PrintValues( IEnumerable^ myList )
{
   IEnumerator^ myEnum = myList->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Object^ obj = safe_cast<Object^>(myEnum->Current);
      Console::Write( "   {0}", obj );
   }

   Console::WriteLine();
}

/* 
This code produces output similar to the following:

myAL
    Count:    3
    Capacity: 4
    Values:   Hello   World   !

*/
import System.*;
import System.Collections.*;

public class SamplesArrayList
{
    public static void main(String[]
 args)
    {
        // Creates and initializes a new ArrayList.
        ArrayList myAL = new ArrayList();

        myAL.Add("Hello");
        myAL.Add("World");
        myAL.Add("!");

        // Displays the properties and values of the ArrayList.
        Console.WriteLine("myAL");
        Console.WriteLine("    Count:    {0}", (Int32)myAL.get_Count());
        Console.WriteLine("    Capacity: {0}", (Int32)myAL.get_Capacity());
        Console.Write("    Values:");
        PrintValues(myAL);
    } //main

    public static void PrintValues(IEnumerable
 myList)
    {
        IEnumerator objMyEnum = myList.GetEnumerator();
        while (objMyEnum.MoveNext()) {
            Object obj = objMyEnum.get_Current();
            Console.Write("   {0}", obj);
        }
        Console.WriteLine();
    } //PrintValues
} //SamplesArrayList 
/* 
 This code produces output similar to the following:
 
 myAL
     Count:    3
     Capacity: 4
     Values:   Hello   World   !

 */
import System;
import System.Collections;

// Creates and initializes a new ArrayList.
var myAL : ArrayList = new ArrayList();
myAL.Add("Hello");
myAL.Add("World");
myAL.Add("!");

// Displays the properties and values of the ArrayList.
Console.WriteLine( "myAL" );
Console.WriteLine( "\tCount:    {0}", myAL.Count );
Console.WriteLine( "\tCapacity: {0}", myAL.Capacity );
Console.Write( "\tValues:" );
PrintValues( myAL );

 
function PrintValues( myList : IEnumerable )  {
   var myEnumerator : System.Collections.IEnumerator = myList.GetEnumerator();
   while ( myEnumerator.MoveNext() )
      Console.Write( "\t{0}", myEnumerator.Current );
   Console.WriteLine();
}
 /* 
 This code produces output similar to the following:
 
 myAL
     Count:    3
     Capacity: 4
     Values:    Hello    World    !
 */
継承階層継承階層
System.Object
  System.Collections.ArrayList
     System.Windows.Forms.DomainUpDown.DomainUpDownItemCollection
スレッド セーフスレッド セーフ
プラットフォームプラットフォーム
バージョン情報バージョン情報
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