第6天第2节：类的封装性

===Representation:

Use tool "Power Designer" to Desgin and generate the code
-------------        ---------------
Classname        Person
--------------      ----------------
properties         +String name
--------------      - int age
method            ----------------
--------------      +void setAge
                        ----------------

第6天 第1节: 面向对象（基础）

OOA: Analysis + OOD: Design + OOP: Programming

==Object Oriented Features
1. encapsulation
2. Inheritance
3. Polymorphism

==Class and objects
1. default properties and methods are public
2. don't have to have constructor and disconstructor
3. object creation steps
    step1: Person per=null;    ==> per is on stack
    step2: per = new Person();  ==> create object properties on heap
    Note: method on globl instruction area when class created.
4. reference
    Person per1 = new Person();
    Person per2 = new Person();
    Person per3 = per1;
    per2 = per1;  ==> the original object referred by per2 will be collected by java

第5天第7节： 新特性对数组的支持

After JDK1.5

==foreach for array
int y[]={1,3,5,};
for(int z:y)System.out.print(z+"\t");  ==>1 3 5

==varying number of args
    int y[]={1,3,5}
    fun(1,3,5,7);
    fun(1);
    fun(y);

    public static void fun(int ... arg) {
        for(int x:arg)System.out.print(x+"\t");
        System.out.println();
    }

第5天第6节： 数组与方法

==definition
int a[] = new int[10] ;
int[] a = new int[10]; 
int a[]={1,3,5,7,9};
both allocates memeoty on heap
a.length  ==>10;

Two steps:
1. int a[] = null;  ==> creates variable a on stack
2. a = new int[10] ==> allocates memory on heap

==reference
int b[]=a;

==2D array

int a[][] = new int[10][2] ;

int[][] a = new int[10][2]; 
int b[][]=a;
a.length ==> 12
a[1].length ==> 2

==Method or Fucntion
naming rule: the first letter of first word is little, the first letter of rest word is capital
function overload: different arg type or different number of args, but not different return type
recursive call: may cause stack overflow

==passing and returning array:
    public static void main (String argvs[] ) {
        int x[]={1,3,5,8};
        int y[];
        y=print(x);
        System.out.println();
        for(int i=0;i<y.length;i++)System.out.print("y["+i+"]="+y[i]+"\t");
        System.out.println();
    }

    public static int[] print(int tx[]) {
        for(int i=0;i<tx.length;i++)System.out.print("tx["+i+"]="+tx[i]+"\t");
        int ty[]={2,4,6};
        return ty;
    }

==Array utility
java.util.Array.sort(y);
System.arraycopy(x,<start_pos>,y,<start_pos>,<num_of_iterm>)

第5天第5节： 基本程序控制语句

==if
if ...
if...else...
if...else if... else ...
switch...case:...default:...  break;

==do
while....
do....while...
for...

break;
continue;

使用EditPlus配置Java编译环境

         在配置EditPlus之前是先将Java的运行环境安装且调试好，然后进入EditPlus，从菜单“工具
（Tools）”;“配置用户工具...”进入用户工具设置，选择“组和工具条目”中的“Group 1”，点击面板右边的“组名称...”按钮，将文本Group1”修改成“Java编译程序”，点击“添加工具”按钮，选择应用程序，然后就是修改属性：

1. 添加编译功能
“菜单文本”里的内容修改为“Javac”；
“命令”选择安装JDK后的Bin目录中的编译程序javac.exe，我的JDK 安装路径为“C:\Program
Files\JDK\j2sdk1.4.2_08”，那么此路径为“C:\Program Files\Java\jdk1.5.0\bin\javac.exe”；
“参数”选择“文件名”，即显示为“$(FileName)”；
“初始目录”选择“文件目录”，显示为“$(FileDir)”；选择“捕获输出”复选框

2. 添加执行功能
“菜单文本”里的内容修改为“Java”；
“命令”选择安装JDK后的BIN目录中的编译程序java.exe，路径为“C:\Program Files\Java\jdk1.5.0\bin\java.exe”；“参数”选择“不带扩展名的文件名”，即显示为“$(FileNameNoExt)”；
“初始目录”选择“文件目录”，显示为“$(FileDir)”；选择“捕获输出”复选框！

这样就完成了EditPlus的基本设置，可以写一段Java程序进行调试，通过Ctrl+1进行编译，使用Ctrl+2运行程序，还可以添加工具栏按钮。

错误提示都会显示在输出窗口中，双击某一行错误信息，EditPlus会自动定位到出错行，怎么样？一个简单的Java IDE界面就出现了。

ps: 要把你写的.java代码保存到你的java文件夹里才行

[solution] How to add menu and toolbar into gvim

==Add menu is easy. Add the following into your .vimrc on Linux or _vimrc on Windows
    amenu &Often.&Easy\ Mode :set im!<cr>
    amenu &Often.Line\ &Wrap :set wrap!<cr>
    amenu &Often.Line\ &Number :set nu!<cr>

This will create three menus Often->Easy Mode, Often->Line Wrap and Often->Line Number. The letter after & is for keyboard shortcuts

==Add Toolbar is two steps.

Step A: Creating 16x16 16 color bmp file

             1. Create a 16x16 icon in Visual Studio, and save to .ico file

             2. Rename .ico file into .bmp file and open in mspaint

             3. Save to 16 color .bmp file ( overwriting the original one ) -- must step

             4. Place the .bmp file in .vim/bitmaps on Linux or vimfiles\bitmaps\

Step B: Add the following into your .vimrc on Linux or _vimrc on Windows

    amenu ToolBar.easy :set im!<cr>

    amenu ToolBar.linewrap :set wrap!<cr>

    amenu ToolBar.linenum :set nu!<cr>

 Where easy, linewrap and linenum are the filename of .bmp file ( without extension )