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第一次使用Extract Method(110) (三)

下一個(gè)步驟是找出程序中對于舊函數(shù)的所有引用(reference)點(diǎn),并修改它們,讓它們改用新函數(shù). 下面是原本的程序:
class Customer...
public String statement() {
    double totalAmount = 0;
    int frequentRenterPoints = 0;
    Enumeration rentals = _rentals.elements();
    String result = "Rental Record for * " + getName() + "\n";
    while(rentals.hasMoreElements()) {
       double thisAmount = 0;
       Rental each = (Rental)rentals.nextElement();    //取得一筆租借記錄

       thisAmount = amountFor(each);

       //   add frequent renter points(累加常客積點(diǎn))
          frequentRenterPoints ++;
          if((each.getMovie().getPriceCode() == Movie.NEW_RELEASE) &&
             each.getDaysRented() > 1)
             frequentRenterPoints ++;

          result += "\t" + each.getMovie().getTitle() + "\t" +
             String.valueOf(thisAmount) + "\n";
          totalAmount += thisAmount;
    }
//   add footer lines(結(jié)尾打印)
    result += "Amount owed is " + String.valueOf(totalAmount) + " \n";
    result += "You earned " + String.valueOf(frequentRenterPoints) +
       "frequent renter points";
    return result;
}

本例之中,這個(gè)步驟很簡單,因?yàn)槲也艅倓偖a(chǎn)生新函數(shù),只有一個(gè)地方使用了它.一般情況下你得在可能運(yùn)用該函數(shù)的所有classes中查找一遍.
class Customer
public String statement() {
    double totalAmount = 0;
    int frequentRenterPoints = 0;
    Enumeration rentals = _rentals.elements();
    String result = "Rental Record for * " + getName() + "\n";
    while(rentals.hasMoreElements()) {
       double thisAmount = 0;
       Rental each = (Rental)rentals.nextElement();    //取得一筆租借記錄

       thisAmount = each.getCharge();

       //   add frequent renter points(累加常客積點(diǎn))
          frequentRenterPoints ++;
          if((each.getMovie().getPriceCode() == Movie.NEW_RELEASE) &&
             each.getDaysRented() > 1)
             frequentRenterPoints ++;

          result += "\t" + each.getMovie().getTitle() + "\t" +
             String.valueOf(thisAmount) + "\n";
          totalAmount += thisAmount;
    }
//   add footer lines(結(jié)尾打印)
    result += "Amount owed is " + String.valueOf(totalAmount) + " \n";
    result += "You earned " + String.valueOf(frequentRenterPoints) +
       "frequent renter points";
    return result;
}

posted @ 2005-08-15 13:00 ivaneeo 閱讀(205) | 評論 (0) | 編輯收藏

第一次使用Extract Method(110) (二)

搬移[金額計(jì)算]代碼
觀察amountFor()時(shí),我發(fā)現(xiàn)這個(gè)函數(shù)使用了來自Rental class的信息,卻沒有使用來自Customer class的信息.

class Customer...
public double amountFor(Rental aRental) {
    double result = 0;
    switch(aRental.getMovie().getPriceCode()) {   //取得影片出租價(jià)格
          case Movie.REGULAR:   //普通片
             result+= 2;
             if(aRental.getDaysRented() > 2)
                result+= (aRental.getDaysRented() - 2) * 1.5;
             break;
          case Movie.NEW_RELEASE:   //新片
             result+= aRental.getDaysRented() * 3;
             break;
          case Movie.CHILDRENS:   //兒童片
             result+= 1.5;
             if(aRental.getDaysRented() > 3)
                result+= (aRental.getDaysRented() - 3) * 1.5;
             break;
       }
    return result;
}
這立刻使我懷疑它是否被放錯(cuò)了位置.大多數(shù)情況下,函數(shù)應(yīng)該放在它使用的數(shù)據(jù)的所屬object(或說class)內(nèi),所以amountFor()應(yīng)該移到Rental class去.為了這么做,我要運(yùn)用Move Method(142).首先把代碼拷貝到Rental class內(nèi),調(diào)整代碼使之適應(yīng)新家,然后重新編譯.下面這樣:

class Rental...
double getCharge() {
    double result = 0;
    switch(getMovie().getPriceCode()) {   //取得影片出租價(jià)格
          case Movie.REGULAR:   //普通片
             result+= 2;
             if(getDaysRented() > 2)
                result+= (getDaysRented() - 2) * 1.5;
             break;
          case Movie.NEW_RELEASE:   //新片
             result+= getDaysRented() * 3;
             break;
          case Movie.CHILDRENS:   //兒童片
             result+= 1.5;
             if(getDaysRented() > 3)
                result+= (getDaysRented() - 3) * 1.5;
             break;
       }
    return result;
}
這個(gè)例子里,[適應(yīng)新家]意味去掉參數(shù).此外,我還要在搬移的同時(shí)變更函數(shù)名稱.

現(xiàn)在我可以測試新函數(shù)是否正常工作.只要改變Customer.amountFor()函數(shù)內(nèi)容,使它委托(delegate)新函數(shù)即可:

class Customer...
    private double amountFor(Rental aRental) {
       return aRental.getCharge();
    }

posted @ 2005-08-15 11:03 ivaneeo 閱讀(190) | 評論 (0) | 編輯收藏

第一次使用Extract Method(110) (一)

實(shí)例代碼:
public String statement() {
    double totalAmount = 0;
    int frequentRenterPoints = 0;
    Enumeration rentals = _rentals.elements();
    String result = "Rental Record for * " + getName() + "\n";
    while(rentals.hasMoreElements()) {
       double thisAmount = 0;
       Rental each = (Rental)rentals.nextElement();    //取得一筆租借記錄

       switch(each.getMovie().getPriceCode()) {   //取得影片出租價(jià)格
          case Movie.REGULAR:   //普通片
             thisAmount += 2;
             if(each.getDaysRented() > 2)
                thisAmount += (each.getDaysRented() - 2) * 1.5;
             break;
          case Movie.NEW_RELEASE:   //新片
             thisAmount += each.getDaysRented() * 3;
             break;
          case Movie.CHILDRENS:   //兒童片
             thisAmount += 1.5;
             if(each.getDaysRented() > 3)
                thisAmount += (each.getDaysRented() - 3) * 1.5;
             break;
       }

       //   add frequent renter points(累加常客積點(diǎn))
          frequentRenterPoints ++;
          if((each.getMovie().getPriceCode() == Movie.NEW_RELEASE) &&
             each.getDaysRented() > 1)
             frequentRenterPoints ++;

          result += "\t" + each.getMovie().getTitle() + "\t" +
             String.valueOf(thisAmount) + "\n";
          totalAmount += thisAmount;
    }

    //   add footer lines(結(jié)尾打印)
    result += "Amount owed is " + String.valueOf(totalAmount) + " \n";
    result += "You earned " + String.valueOf(frequentRenterPoints) +
       "frequent renter points";
    return result;
}

第一步驟是找出代碼的邏輯泥團(tuán)并運(yùn)用Extract Method(110).本例一個(gè)明顯的邏輯泥團(tuán)就是switch語句,把它提煉(extract)到獨(dú)立函數(shù)中似乎比較好.

首先我得在這段代碼里頭找出函數(shù)內(nèi)的局部變量(local variables)和參數(shù)(parameters).我找到了兩個(gè):each和thisAmount,前者并未被修改,后者會(huì)被修改.任何不會(huì)被修改的變量都可以被我當(dāng)成參數(shù)傳入新的函數(shù),至于會(huì)被修改的變量就需格外小心.如果只有一個(gè)變量會(huì)被修改,我可以把它當(dāng)作返回值.thisAmount是個(gè)臨時(shí) 變量,其值在每次循環(huán)起始處被設(shè)為0,并且在switch語句之前不會(huì)改變,所以我可以把新函數(shù)的返回值賦予它.

public String statement() {
    double totalAmount = 0;
    int frequentRenterPoints = 0;
    Enumeration rentals = _rentals.elements();
    String result = "Rental Record for * " + getName() + "\n";
    while(rentals.hasMoreElements()) {
       double thisAmount = 0;
       Rental each = (Rental)rentals.nextElement();    //取得一筆租借記錄

       thisAmount = amountFor(each);

       //   add frequent renter points(累加常客積點(diǎn))
          frequentRenterPoints ++;
          if((each.getMovie().getPriceCode() == Movie.NEW_RELEASE) &&
             each.getDaysRented() > 1)
             frequentRenterPoints ++;

          result += "\t" + each.getMovie().getTitle() + "\t" +
             String.valueOf(thisAmount) + "\n";
          totalAmount += thisAmount;
    }
//   add footer lines(結(jié)尾打印)
    result += "Amount owed is " + String.valueOf(totalAmount) + " \n";
    result += "You earned " + String.valueOf(frequentRenterPoints) +
       "frequent renter points";
    return result;
}

public double amountFor(Rental each) {
    double thisAmount = 0;
    switch(each.getMovie().getPriceCode()) {   //取得影片出租價(jià)格
          case Movie.REGULAR:   //普通片
             thisAmount += 2;
             if(each.getDaysRented() > 2)
                thisAmount += (each.getDaysRented() - 2) * 1.5;
             break;
          case Movie.NEW_RELEASE:   //新片
             thisAmount += each.getDaysRented() * 3;
             break;
          case Movie.CHILDRENS:   //兒童片
             thisAmount += 1.5;
             if(each.getDaysRented() > 3)
                thisAmount += (each.getDaysRented() - 3) * 1.5;
             break;
       }
    return thisAmount;
}

現(xiàn)在,已經(jīng)把原本的函數(shù)分為兩塊,可以分別處理它們.我不喜歡amountFor()內(nèi)的某些變量名稱,現(xiàn)在是修改它們的時(shí)候.
下面是原本的代碼:
   public double amountFor(Rental each) {
    double thisAmount = 0;
    switch(each.getMovie().getPriceCode()) {   //取得影片出租價(jià)格
          case Movie.REGULAR:   //普通片
             thisAmount += 2;
             if(each.getDaysRented() > 2)
                thisAmount += (each.getDaysRented() - 2) * 1.5;
             break;
          case Movie.NEW_RELEASE:   //新片
             thisAmount += each.getDaysRented() * 3;
             break;
          case Movie.CHILDRENS:   //兒童片
             thisAmount += 1.5;
             if(each.getDaysRented() > 3)
                thisAmount += (each.getDaysRented() - 3) * 1.5;
             break;
       }
    return thisAmount;
}

下面是易名后的代碼:
public double amountFor(Rental aRental) {
    double result = 0;
    switch(aRental.getMovie().getPriceCode()) {   //取得影片出租價(jià)格
          case Movie.REGULAR:   //普通片
             result += 2;
             if(aRental.getDaysRented() > 2)
                result += (aRental.getDaysRented() - 2) * 1.5;
             break;
          case Movie.NEW_RELEASE:   //新片
             result += aRental.getDaysRented() * 3;
             break;
          case Movie.CHILDRENS:   //兒童片
             result += 1.5;
             if(aRental.getDaysRented() > 3)
                result += (aRental.getDaysRented() - 3) * 1.5;
             break;
       }
    return result;
}

posted @ 2005-08-15 10:15 ivaneeo 閱讀(422) | 評論 (0) | 編輯收藏

重構(gòu)詞匯(1)

1.邏輯泥團(tuán)(logical clump),這里是指類似下面的邏輯混在一起的代碼:
...
    switch(each.getMovie().getPriceCode()) {
       case Movie.REGULAR:
          thisAmount += 2;
       .....
       case Movie.CHILDRENDS:
          thisAmount += 1.5;
          if(each.getDaysRented() > 3)
             thisAmount += (each.getDaysRented() - 3)*1.5;
       break;
    }
...
2.重構(gòu)名錄(refactoring catalog)是指常用的重構(gòu)方法列出的名錄.

posted @ 2005-08-15 09:44 ivaneeo 閱讀(250) | 評論 (0) | 編輯收藏

快速而隨性

快速而隨性地(quick and dirty)地設(shè)計(jì)一個(gè)簡單的程序并沒有錯(cuò).

posted @ 2005-08-12 15:53 ivaneeo 閱讀(171) | 評論 (0) | 編輯收藏

在debian下jdk1.4.2中文亂碼的解決

1.首先,把windows的simsun.ttc文件考到指定目錄,重命名為simsun.ttf.

2.注冊字體:到JAVA_HOME下的jre/lib/fonts下.編輯fonts.dir.具體如下:第一行的數(shù)字加一.在最后一行加入一句: simsun.ttf -default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.
可選字體的還有: simsun.ttf -SungtiL GB-medium-r-normal--0-0-0-0-c-0-gb2312.1988-0
simsun.ttf -misc-SimSun-medium-r-normal--*-%d-*-*-c-*-iso10646-1

3.修改JAVA_HOME下的jre/lib/的font.properties文件(這里的font.properties文件最好做備份).
($cp -v font.properties.zh_CN.Sun font.properties)

修改的地方有三處:
A.類似如下的 serif.0=-b&h-lucidabright-medium-r-normal--*-%d-*-*-p-*-iso8859-1
serif.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0
看到xxxx.1=后面的字體全部改成已經(jīng)注冊的字體.

B.類似如下的 fontset.serif.plain=\
-b&h-lucidabright-medium-r-normal--*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0
fontset.serif.plain=\后的第二行字體全部改成注冊的字體.

C.最后一行:appendedfontpath=/usr/share/fonts/truetype.這里的/usr/share/fonts/truetype是simsun.ttf的考到的目錄名.

具體文件如下：
# @(#)font.properties.zh_CN.Sun.linux 1.1 03/07/14
# Copyright 2003 Sun Microsystems, Inc. All rights reserved.
#

# Component Font Mappings For Linux zh_CN
#
serif.0=-b&h-lucidabright-medium-r-normal--*-%d-*-*-p-*-iso8859-1
serif.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

serif.italic.0=-b&h-lucidabright-medium-i-normal--*-%d-*-*-p-*-iso8859-1
serif.italic.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

serif.bold.0=-b&h-lucidabright-demibold-r-normal--*-%d-*-*-p-*-iso8859-1
serif.bold.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

serif.bolditalic.0=-b&h-lucidabright-demibold-i-normal--*-%d-*-*-p-*-iso8859-1
serif.bolditalic.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

sansserif.0=-b&h-lucidasans-medium-r-normal-sans-*-%d-*-*-p-*-iso8859-1
sansserif.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

sansserif.italic.0=-b&h-lucidasans-medium-i-normal-sans-*-%d-*-*-p-*-iso8859-1
sansserif.italic.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

sansserif.bold.0=-b&h-lucidasans-bold-r-normal-sans-*-%d-*-*-p-*-iso8859-1
sansserif.bold.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

sansserif.bolditalic.0=-b&h-lucidasans-bold-i-normal-sans-*-%d-*-*-p-*-iso8859-1
sansserif.bolditalic.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

monospaced.0=-b&h-lucidatypewriter-medium-r-normal-sans-*-%d-*-*-m-*-iso8859-1
monospaced.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

monospaced.italic.0=-b&h-lucidatypewriter-medium-r-normal-sans-*-%d-*-*-m-*-iso8859-1
monospaced.italic.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

monospaced.bold.0=-b&h-lucidatypewriter-bold-r-normal-sans-*-%d-*-*-m-*-iso8859-1
monospaced.bold.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

monospaced.bolditalic.0=-b&h-lucidatypewriter-bold-r-normal-sans-*-%d-*-*-m-*-iso8859-1
monospaced.bolditalic.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

dialog.0=-b&h-lucidasans-medium-r-normal-sans-*-%d-*-*-p-*-iso8859-1
dialog.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

dialog.italic.0=-b&h-lucidasans-medium-i-normal-sans-*-%d-*-*-p-*-iso8859-1
dialog.italic.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

dialog.bold.0=-b&h-lucidasans-bold-r-normal-sans-*-%d-*-*-p-*-iso8859-1
dialog.bold.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

dialog.bolditalic.0=-b&h-lucidasans-bold-i-normal-sans-*-%d-*-*-p-*-iso8859-1
dialog.bolditalic.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

dialoginput.0=-b&h-lucidatypewriter-medium-r-normal-sans-*-%d-*-*-m-*-iso8859-1
dialoginput.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

dialoginput.italic.0=-b&h-lucidatypewriter-medium-r-normal-sans-*-%d-*-*-m-*-iso8859-1
dialoginput.italic.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

dialoginput.bold.0=-b&h-lucidatypewriter-bold-r-normal-sans-*-%d-*-*-m-*-iso8859-1
dialoginput.bold.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

dialoginput.bolditalic.0=-b&h-lucidatypewriter-bold-r-normal-sans-*-%d-*-*-m-*-iso8859-1
dialoginput.bolditalic.1=-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

# Missing Glyph Character
#
default.char=274f

# Component Font Character Encodings
#
fontcharset.serif.0=sun.io.CharToByteISO8859_1
fontcharset.serif.1=sun.io.CharToByteGBK

fontcharset.sansserif.0=sun.io.CharToByteISO8859_1
fontcharset.sansserif.1=sun.io.CharToByteGBK

fontcharset.monospaced.0=sun.io.CharToByteISO8859_1
fontcharset.monospaced.1=sun.io.CharToByteGBK

fontcharset.dialog.0=sun.io.CharToByteISO8859_1
fontcharset.dialog.1=sun.io.CharToByteGBK

fontcharset.dialoginput.0=sun.io.CharToByteISO8859_1
fontcharset.dialoginput.1=sun.io.CharToByteGBK

# Exclusion Ranges
#

# XFontSet Information
#
fontset.serif.plain=\
-b&h-lucidabright-medium-r-normal--*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.serif.italic=\
-b&h-lucidabright-medium-i-normal--*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.serif.bold=\
-b&h-lucidabright-demibold-r-normal--*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.serif.bolditalic=\
-b&h-lucidabright-demibold-i-normal--*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.sansserif.plain=\
-b&h-lucidasans-medium-r-normal-sans-*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.sansserif.italic=\
-b&h-lucidasans-medium-i-normal-sans-*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.sansserif.bold=\
-b&h-lucidasans-bold-r-normal-sans-*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.sansserif.bolditalic=\
-b&h-lucidasans-bold-i-normal-sans-*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.monospaced.plain=\
-b&h-lucidatypewriter-medium-r-normal-sans-*-%d-*-*-m-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.monospaced.italic=\
-b&h-lucidatypewriter-medium-r-normal-sans-*-%d-*-*-m-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.monospaced.bold=\
-b&h-lucidatypewriter-bold-r-normal-sans-*-%d-*-*-m-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.monospaced.bolditalic=\
-b&h-lucidatypewriter-bold-r-normal-sans-*-%d-*-*-m-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.dialog.italic=\
-b&h-lucidasans-medium-i-normal-sans-*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.dialog.bold=\
-b&h-lucidasans-bold-r-normal-sans-*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.dialog.bolditalic=\
-b&h-lucidasans-bold-i-normal-sans-*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.dialog.plain=\
-b&h-lucidasans-medium-r-normal-sans-*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.dialoginput.italic=\
-b&h-lucidatypewriter-medium-r-normal-sans-*-%d-*-*-m-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.dialoginput.bold=\
-b&h-lucidatypewriter-bold-r-normal-sans-*-%d-*-*-m-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.dialoginput.bolditalic=\
-b&h-lucidatypewriter-bold-r-normal-sans-*-%d-*-*-m-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.dialoginput.plain=\
-b&h-lucidatypewriter-medium-r-normal-sans-*-%d-*-*-m-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

fontset.default=\
-b&h-lucidasans-medium-r-normal-sans-*-%d-*-*-p-*-iso8859-1,\
-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.

filename.-default-simsun-medium-r-normal--*-100-*-*-c-*-gb2312.1980-0.=/usr/share/fonts/truetype/simsun.ttf

appendedfontpath=/usr/share/fonts/truetype

posted @ 2005-08-11 13:38 ivaneeo 閱讀(729) | 評論 (0) | 編輯收藏

一個(gè)有用的從Reader向InputStream轉(zhuǎn)換的類

public class ReaderInputStream extends InputStream {
   protected Reader reader;
   protected ByteArrayOutputStream byteArrayOut;
   protected Writer writer;
   protected char[] chars;
   protected byte[] buffer;
   protected int index, length;

      /**
       * 帶Reader參數(shù)構(gòu)造函數(shù)
       *
       * @param reader - InputStream使用的Reader
       */
      public ReaderInputStream(Reader reader) {
        this.reader = reader;
        byteArrayOut = new ByteArrayOutputStream();
        writer = new OutputStreamWriter(byteArrayOut);
        chars = new char[1024];
      }

      /**
       * 帶Reader和字符編碼格式參數(shù)的構(gòu)造函數(shù)
       *
       * @param reader   - InputStream使用的Reader
       * @param encoding - InputStream使用的字符編碼格式.
       * @throws 如果字符編碼格式不支持,則拋UnsupportedEncodingException異常
       */
      public ReaderInputStream(Reader reader, String encoding)
       throws UnsupportedEncodingException {
        this.reader = reader;
        byteArrayOut = new ByteArrayOutputStream();
        writer = new OutputStreamWriter(byteArrayOut, encoding);
        chars = new char[1024];
      }

      /**
       * @see java.io.InputStream#read()
       */
      public int read() throws IOException {
        if (index >= length)
          fillBuffer();
        if (index >= length)
          return -1;
        return 0xff & buffer[index++];
      }

      protected void fillBuffer() throws IOException {
        if (length < 0)
          return;
        int numChars = reader.read(chars);
        if (numChars < 0) {
          length = -1;
        } else {
          byteArrayOut.reset();
          writer.write(chars, 0, numChars);
          writer.flush();
          buffer = byteArrayOut.toByteArray();
          length = buffer.length;
          index = 0;
        }
      }

      /**
       * @see java.io.InputStream#read(byte[], int, int)
       */
      public int read(byte[] data, int off, int len) throws IOException {
        if (index >= length)
          fillBuffer();
        if (index >= length)
          return -1;
        int amount = Math.min(len, length - index);
        System.arraycopy(buffer, index, data, off, amount);
        index += amount;
        return amount;
      }

      /**
       * @see java.io.InputStream#available()
       */
      public int available() throws IOException {
        return (index < length) ? length - index :
            ((length >= 0) && reader.ready()) ? 1 : 0;
      }

      /**
       * @see java.io.InputStream#close()
       */
      public void close() throws IOException {
        reader.close();
      }

}

posted @ 2005-08-11 09:27 ivaneeo 閱讀(2318) | 評論 (0) | 編輯收藏

使用縮略語(Abbreviations)

1. 啟動(dòng)emacs.
2.打開jde-mode方式.
3.在打開jde-abbrev-mode方式.

然后輸入if,接著按空格鍵(輸入if的條件);展開if語句.
if(i == 0) {
} // end of if (i == 0)

表 1. Abbreviations

語句	Abbreviation
`if-then`	`if`
`else`	`else`
`if-then-else`	`ife`
`else-if`	`eif`
`while`	`while`
`for`	`for`
`for (int I=0;I<UL;I++)`	`fori`
`for (Iterator i = c.iterator(); i.hasNext();)`	`foriter`
`main method`	`main`
`switch`	`switch`
`case`	`case`
`try`	`try`
`catch`	`catch`
`try finally`	`tryf`
`finally`	`finally`

posted @ 2005-08-09 11:01 ivaneeo 閱讀(172) | 評論 (0) | 編輯收藏

在jde里注冊jdk

首先,需打開jde模式.(M-x jde-mode)

在JDEE里注冊一個(gè)新的jdk:

打開emacs.
輸入 M-x customize-variable 并回車.
Emacs 提示你要自定義的變量名.
輸入 jde-jdk-registry 并回車.
jde-jdk-registry 的配置界面.
按 INS 按鈕.
顯示 JDK 項(xiàng).
輸入JDK的版本號和 JDK 的安裝路徑.
重復(fù)先前的步驟.
按 State 按鈕.
State 菜單顯示.
選擇 Save for Future Sessions .
Note
This saves the setting of jde-jdk-registry in your .emacs file.
按 Finish button保存.

選擇JDK

選擇 JDK:

輸入 M-x customize-variable 并回車.

Emacs 提示你要自定義的變量.
輸入 jde-jdk 并回車.
jde-jdk 的配置界面.
緩沖區(qū)里顯示注冊的jdk的列表.
按radio button 選擇你要使用的jdk.
按State 按鈕.
State 菜單顯示.
選擇 Save for Future Sessions.
按 Finish 按鈕保存設(shè)置.

posted @ 2005-08-08 17:16 ivaneeo 閱讀(363) | 評論 (0) | 編輯收藏

在firefox里安裝java插件

我的java是jre1.4.2的.
首先是進(jìn)入firefox的插件目錄.我的是~/.mozilla/plugins.
然后是確定jre的插件目錄.我的是~/programs/j2sdk1.4.2_08/jre/plugin/i386/ns610-gcc32.這里是使用gcc32的系統(tǒng).
最后是做連接.具體如下:
$cd ~/.mozilla/plugins
$ln -s ~/programs/j2sdk1.4.2_08/jre/plugin/i386/ns610-gcc32/libjavaplugin_oji.so
重起firefox,確定插件是否安裝成功.在firefox輸入about:plugins.有就成功了.

posted @ 2005-08-08 14:54 ivaneeo 閱讀(997) | 評論 (0) | 編輯收藏

僅列出標(biāo)題