1 标准方法： 
   var MyArr: array[0..10] of Integer; //定义静态数组

 2 可以使用非0下标： 
   var MyArr: array[9..10] of Integer; //不能提倡，这样不容易与系统函数沟通

 3 根据预定义类型来声明数组： 
   type TMyArr = array[0..10] of Integer; //先定义一个数组类型 var MyArr: TMyArr; //再定义静态数组

 4 在非过程区可以直接赋值： 
   var MyArr: array[0..2] of Integer = (11,22,33);//过程中无法直接赋值操作

 6 多维数组： 
   var MyArr: array[0..2, 0..2] of Integer; begin //使用 MyArr[1,2] := 100; end;

 7 根据子界定义数组： 
   type TRange = 0..10; var MyArr: array[TRange] of Integer;

 8 根据枚举定义数组： 
   type TEnums = (Enum1,Enum2,Enum3); 
　　var MyArr: array[TEnums] of string; 
　　begin MyArr[Enum1] := '万一';//Enum1,Enum2,Enum3就相当于普通数组的下标
　　ShowMessage(MyArr[Enum1]); //万一 end;

9 根据其他类型定义数组： 
  var MyArr: array[Byte] of Char; begin MyArr[255] := #65; ShowMessage(MyArr[255]); //A end;

  应尽量不使用内建类型，可以新建类型： 
  type TNewByte = Byte; var MyArr: array[TNewByte] of Char; begin MyArr[255] := #65; ShowMessage(MyArr[255]); //A end; 


  也可以使用类型别名： 
  type TChar = type Char; var MyArr: array[TChar] of Byte; begin MyArr['C'] := 255; ShowMessage(IntToStr(MyArr['C'])); //255 end; 


  同时定义类型: 
  type MyRec = record s: string; r: Real; b: Byte; end; var Arr1: array[0..100] of MyRec; Arr2: array[0..100] of record s: string; r: Real; b: Byte; end; 
  可以直接这样定义： 
  Arr3: packed array[0..100] of MyRec; //压缩数组定义, 好像没有区别?

1 常规定义： 
 var StrArr: array of String; //动态数组定义时不与维数 begin SetLength(StrArr,6); //分配6个元素位置: 0-5 StrArr[0] := '万一';

2 指针复制操作与Copy函数：
 var
   Arr1,Arr2: array of Integer;
 begin
   SetLength(Arr1,6);
   Arr1[5] := 100;
   Arr2 := Arr1;//指针赋值操作
   ShowMessage(IntToStr(Length(arr2)));//arr2引用了arr1，所以arr2长度也为6.
   ShowMessage(IntToStr(arr2[5]));//arr2引用了arr1，结果100
     Arr2[5]:= 99;                  //动态数组也是一个指针，改变其中一个数组元素值，另外一个也会改变
     ShowMessage(IntToStr(arr1[5]));//结果99
     arr2 := nil;
     ShowMessage(IntToStr(arr1[5]));//释放其中一个数组，另外一个没有影响
     Arr2  := Copy(arr1);//Copy函数是将两个相同类型的数组进行赋值，此时复制的是所有数组元素
     ShowMessage(IntToStr(arr2[5]));//结果99，这种操作与指针不同，两个数组之间没有联系。

3 动态多维数组:
  var Arr: array of array of Integer; begin SetLength(Arr,5,5); //分配空间 Arr[0,3] := 100; //赋值 ShowMessage(IntToStr(Arr[0,3])); //取值

4 变体数组：
 var
    Arr: array[0..3] of Variant;// Variant为变体类型关键字
  begin
    Arr[0] := 123;
    Arr[1] := 'wy';
    Arr[2] := True;
    Arr[3] := VarArrayOf([1,'wanyi',1.5]); //变体数组的元素也可以是变体数组
    ShowMessage(Arr[0]); //123,不需要转换
    ShowMessage(Arr[1]); //wy
    ShowMessage(Arr[2]); //True
    ShowMessage(Arr[3][1]); //wanyi
  end;

 5 枚举数组：
   procedure TForm1.Button1Click(Sender: TObject);
   type
     TMyEnum = (Monday,Tuesday,Wednesday,Thursday,Friday,Saturday,Sunday); //定义枚举}
   var
     weekArr: array[TMyEnum] of string; //定义数组 数组元素是String类型
     myEnum: TMyEnum; //定义枚举变量}
   begin //数组赋值}
     weekArr[Monday] := '星期一';
     weekArr[Tuesday] := '星期二';
     weekArr[Wednesday] := '星期三';
     weekArr[Thursday] := '星期四';
     weekArr[Friday] := '星期五';
     weekArr[Saturday] := '星期六';
     weekArr[Sunday] := '星期天'; 
     ShowMessage(weekArr[Sunday]); //星期天}
     //遍历数组 必须定义myEnum: TMyEnum枚举变量，因为TmyEnum是数组维数，也就是下标 
     for myEnum := Low(weekArr) to High(weekArr) do
     begin
       ShowMessage(weekArr[myEnum]); //将分别显示: 星期一 ... 星期天}
     end;
   end;

数组定义时,如果唯数是以枚举开始的话,编译指令是从Low()..High() 
所以带有负数值的枚举用来定义数组常量会出错. 
 Type 
 TErrorCode = (ecNOERROR = 0, 
 ecDisConnect = -1, 
 ecOtherError = -2); 
 Const 
 ErrorLabels : array [TErrorCode] of String =( 
'无错误' , '断开连接' , '其他错误'); 
procedure TForm1.FormCreate(Sender: TObject); 
begin 
Caption := ErrorLabels[ecOtherError]; 
end; 
Caption得到的是:无错误,那是因为Low(TErrorCode)=ecOtherError 
High(TErrorCode)就是ecNOERROR 

 6 子界数组： 

   procedure TForm1.Button1Click(Sender: TObject);
 type
   TABC = 'A'..'G'; //定义子界}
 var
   abcArr: array[TABC] of Integer; //定义数组 数组元素是 Integer类型
   abc: TABC; //定义子界变量}
 begin //数组赋值}
   abcArr['A'] := 11;
   abcArr['B'] := 22;
   abcArr['C'] := 33;
   abcArr['D'] := 44;
   abcArr['E'] := 55;
   abcArr['F'] := 66;
   abcArr['G'] := 77;
   ShowMessage(IntToStr(abcArr['G'])); //77
   //遍历数组 必须定义子界变量abc: TABC 因为 TABC 是数组维数，也就是下标
   for abc := Low(abcArr) to High(abcArr) do
   begin
     ShowMessage(IntToStr(abcArr[abc])); //11 22 33 44 55 66 77
   end;
 end;
 end.

常规：
procedure TForm1.Button1Click(Sender: TObject);
const
  //因为过程中var无法直接赋值，所以需要const
  arr: array[0..1] of Char = ('A','B');
begin
  ShowMessage(arr); //AB
  ShowMessage(IntToStr(Length(arr))); //2
end;

数组的其他定义方式：
procedure TForm1.Button1Click(Sender: TObject);
const
  arr: array[Boolean] of Char = ('A','B');
begin
  ShowMessage(arr); //AB
  ShowMessage(IntToStr(Length(arr))); //2
  //访问元素
  ShowMessage(arr[False]); //A
  ShowMessage(arr[True]); //B
  //也可以这样访问
  ShowMessage(arr[Low(arr)]); {A}
  ShowMessage(arr[High(arr)]); {B}
  //但不能这样访问} // ShowMessage(arr[0]); // ShowMessage(arr[1]);
  //但可以变通一下}
  ShowMessage(arr[Boolean(0)]); //A
  ShowMessage(arr[Boolean(1)]); //B
end;

procedure TForm1.Button1Click(Sender: TObject);
const
  arr: array[Byte] of Integer = ( 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,
    21,22,23,24,25,26,27,28,29, 30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,
    47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,
    73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,
    99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,
    119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,
    139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,
    159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,
    179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,
    199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,
    219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,
    239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,256);
begin
  ShowMessage(IntToStr(arr[Low(arr)])); //1
  ShowMessage(IntToStr(arr[High(arr)])); //256
  ShowMessage(IntToStr(Length(arr))); //256
end;
end.

procedure TForm1.Button1Click(Sender: TObject);
const
  BoolStr: array[Boolean] of string = ('False', 'True');//过程区直接赋值，所以需要Const 关键字
var
  b: Boolean;
begin
  b := True;
  ShowMessage(BoolStr[b]); {True}
  b := not b;
  ShowMessage(BoolStr[b]); {False}
end;
end.

 动态数组一般是不需要手动释放的, 如果需要.：
  var arr: array of Integer; begin {设置动态数组维数}     
  SetLength(arr,10); 
  arr := nil;//释放方法一 
  SetLength(arr, 0);//释放方法二
  Finalize(arr); //释放方法三 
  end;