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【其它话题】求助一段java code
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【其它话题】求助一段java code<!--[if gte mso 9]><xml> <o:documentproperties> <o:author>Bruce Eckel</o:author> <o:version>14.00</o:version> </o:documentproperties> <o:officedocumentsettings> <o:allowpng /> </o:officedocumentsettings> </xml><![endif]--><!--[if gte mso 9]><xml> <w:worddocument> <w:view>Normal</w:view> <w:zoom>0</w:zoom> <w:trackmoves /> <w:trackformatting /> <w:punctuationkerning /> <w:validateagainstschemas /> <w:saveifxmlinvalid>false</w:saveifxmlinvalid> <w:ignoremixedcontent>false</w:ignoremixedcontent> <w:alwaysshowplaceholdertext>false</w:alwaysshowplaceholdertext> <w:donotpromoteqf /> <w:lidthemeother>EN-SG</w:lidthemeother> <w:lidthemeasian>ZH-CN</w:lidthemeasian> <w:lidthemecomplexscript>X-NONE</w:lidthemecomplexscript> <w:compatibility> <w:breakwrappedtables /> <w:snaptogridincell /> <w:wraptextwithpunct /> <w:useasianbreakrules /> <w:dontgrowautofit /> <w:splitpgbreakandparamark /> <w:enableopentypekerning /> <w:dontflipmirrorindents /> <w:overridetablestylehps /> 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name="Colorful Grid Accent 3" /> <w:lsdexception locked="false" priority="60" semihidden="false" unhidewhenused="false" name="Light Shading Accent 4" /> <w:lsdexception locked="false" priority="61" semihidden="false" unhidewhenused="false" name="Light List Accent 4" /> <w:lsdexception locked="false" priority="62" semihidden="false" unhidewhenused="false" name="Light Grid Accent 4" /> <w:lsdexception locked="false" priority="63" semihidden="false" unhidewhenused="false" name="Medium Shading 1 Accent 4" /> <w:lsdexception locked="false" priority="64" semihidden="false" unhidewhenused="false" name="Medium Shading 2 Accent 4" /> <w:lsdexception locked="false" priority="65" semihidden="false" unhidewhenused="false" name="Medium List 1 Accent 4" /> <w:lsdexception locked="false" priority="66" semihidden="false" unhidewhenused="false" name="Medium List 2 Accent 4" /> <w:lsdexception locked="false" priority="67" semihidden="false" unhidewhenused="false" name="Medium Grid 1 Accent 4" /> <w:lsdexception locked="false" priority="68" semihidden="false" unhidewhenused="false" name="Medium Grid 2 Accent 4" /> <w:lsdexception locked="false" priority="69" semihidden="false" unhidewhenused="false" name="Medium Grid 3 Accent 4" /> <w:lsdexception locked="false" priority="70" semihidden="false" unhidewhenused="false" name="Dark List Accent 4" /> <w:lsdexception locked="false" priority="71" semihidden="false" unhidewhenused="false" name="Colorful Shading Accent 4" /> <w:lsdexception locked="false" priority="72" semihidden="false" unhidewhenused="false" name="Colorful List Accent 4" /> <w:lsdexception locked="false" priority="73" semihidden="false" unhidewhenused="false" name="Colorful Grid Accent 4" /> <w:lsdexception locked="false" priority="60" semihidden="false" unhidewhenused="false" name="Light Shading Accent 5" /> <w:lsdexception locked="false" priority="61" semihidden="false" unhidewhenused="false" name="Light List Accent 5" /> <w:lsdexception locked="false" priority="62" semihidden="false" unhidewhenused="false" name="Light Grid Accent 5" /> <w:lsdexception locked="false" priority="63" semihidden="false" unhidewhenused="false" name="Medium Shading 1 Accent 5" /> <w:lsdexception locked="false" priority="64" semihidden="false" unhidewhenused="false" name="Medium Shading 2 Accent 5" /> <w:lsdexception locked="false" priority="65" semihidden="false" unhidewhenused="false" name="Medium List 1 Accent 5" /> <w:lsdexception locked="false" priority="66" semihidden="false" unhidewhenused="false" name="Medium List 2 Accent 5" /> <w:lsdexception locked="false" priority="67" semihidden="false" unhidewhenused="false" name="Medium Grid 1 Accent 5" /> <w:lsdexception locked="false" priority="68" semihidden="false" unhidewhenused="false" name="Medium Grid 2 Accent 5" /> <w:lsdexception locked="false" priority="69" semihidden="false" unhidewhenused="false" name="Medium Grid 3 Accent 5" /> <w:lsdexception locked="false" priority="70" semihidden="false" unhidewhenused="false" name="Dark List Accent 5" /> <w:lsdexception locked="false" priority="71" semihidden="false" unhidewhenused="false" name="Colorful Shading Accent 5" /> <w:lsdexception locked="false" priority="72" semihidden="false" unhidewhenused="false" name="Colorful List Accent 5" /> <w:lsdexception locked="false" priority="73" semihidden="false" unhidewhenused="false" name="Colorful Grid Accent 5" /> <w:lsdexception locked="false" priority="60" semihidden="false" unhidewhenused="false" name="Light Shading Accent 6" /> <w:lsdexception locked="false" priority="61" semihidden="false" unhidewhenused="false" name="Light List Accent 6" /> <w:lsdexception locked="false" priority="62" semihidden="false" unhidewhenused="false" name="Light Grid Accent 6" /> <w:lsdexception locked="false" priority="63" semihidden="false" unhidewhenused="false" name="Medium Shading 1 Accent 6" /> <w:lsdexception locked="false" priority="64" semihidden="false" unhidewhenused="false" name="Medium Shading 2 Accent 6" /> <w:lsdexception locked="false" priority="65" semihidden="false" unhidewhenused="false" name="Medium List 1 Accent 6" /> <w:lsdexception locked="false" priority="66" semihidden="false" unhidewhenused="false" name="Medium List 2 Accent 6" /> <w:lsdexception locked="false" priority="67" semihidden="false" unhidewhenused="false" name="Medium Grid 1 Accent 6" /> <w:lsdexception locked="false" priority="68" semihidden="false" unhidewhenused="false" name="Medium Grid 2 Accent 6" /> <w:lsdexception locked="false" priority="69" semihidden="false" unhidewhenused="false" name="Medium Grid 3 Accent 6" /> <w:lsdexception locked="false" priority="70" semihidden="false" unhidewhenused="false" name="Dark List Accent 6" /> <w:lsdexception locked="false" priority="71" semihidden="false" unhidewhenused="false" name="Colorful Shading Accent 6" /> <w:lsdexception locked="false" priority="72" semihidden="false" unhidewhenused="false" name="Colorful List Accent 6" /> <w:lsdexception locked="false" priority="73" semihidden="false" unhidewhenused="false" name="Colorful Grid Accent 6" /> <w:lsdexception locked="false" priority="19" semihidden="false" unhidewhenused="false" qformat="true" name="Subtle Emphasis" /> <w:lsdexception locked="false" priority="21" semihidden="false" unhidewhenused="false" qformat="true" name="Intense Emphasis" /> <w:lsdexception locked="false" priority="31" semihidden="false" unhidewhenused="false" qformat="true" name="Subtle Reference" /> <w:lsdexception locked="false" priority="32" semihidden="false" unhidewhenused="false" qformat="true" name="Intense Reference" /> <w:lsdexception locked="false" priority="33" semihidden="false" unhidewhenused="false" qformat="true" name="Book Title" /> <w:lsdexception locked="false" priority="37" name="Bibliography" /> <w:lsdexception locked="false" priority="39" qformat="true" name="TOC Heading" /> </w:latentstyles> </xml><![endif]--><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} </style> <![endif]-->小弟目前刚刚上手java, 看到think in java里有这一段code,如下:

//: reusing/SprinklerSystem.java
// Composition for code reuse.
class WaterSource {
private String s;
WaterSource() {
System.out.println("WaterSource()");
s = "Constructed";
}
public String toString() { return s; }
}



public class SprinklerSystem {
private String valve1, valve2, valve3, valve4;
private WaterSource source = new WaterSource();
private int i;
private float f;
public String toString() {
return
"valve1 = " + valve1 + " " +
"valve2 = " + valve2 + " " +
"valve3 = " + valve3 + " " +
"valve4 = " + valve4 + "\n" +
"i = " + i + " " + "f = " + f + " " +
"source = " + source;
}
public static void main(String[] args) {
SprinklerSystem sprinklers = new SprinklerSystem();
System.out.println(sprinklers);
}
}
 
/* Output:
WaterSource()
valve1 = null valve2 = null valve3 = null valve4 = null
i = 0 f = 0.0 source = Constructed
*///:


实在不懂为什么最后output里的source=Constructed. 特地前来请教,在线等。

[about:home (8-16 14:53, Long long ago)] [ 传统版 | sForum ][登录后回复]1楼

前面那一大段吓到我了……想说,不是问java来着吗= =[小妖霖霖 (8-16 15:13, Long long ago)] [ 传统版 | sForum ][登录后回复]2楼

不知道有没解释对SprinklerSystem类里面定义了soure这一变量
private WaterSource source = new WaterSource();
也就是说source 这个变量属于WaterSource类
然后main程序中System.out.println(sprinklers)会调用
public String toString() {

return

"valve1 = " + valve1 + " " +

"valve2 = " + valve2 + " " +

"valve3 = " + valve3 + " " +

"valve4 = " + valve4 + "\n" +

"i = " + i + " " + "f = " + f + " " +

"source = " + source;

}

这里面"source = " + source;这一句又会调用source这一变量(属于WaterSource类)中的
public String toString() { return s; }
而s的初始值是 Constructed
[月之女祭司 (8-16 15:23, Long long ago)] [ 传统版 | sForum ][登录后回复]3楼

(引用 月之女祭司:不知道有没解释对SprinklerSystem类里面定义了soure这一变量 private WaterSource source = new WaterSource(); 也就是说source 这个变量...)先送些分给你~~~[小妖霖霖 (8-16 15:26, Long long ago)] [ 传统版 | sForum ][登录后回复]4楼

(引用 月之女祭司:不知道有没解释对SprinklerSystem类里面定义了soure这一变量 private WaterSource source = new WaterSource(); 也就是说source 这个变量...)谢谢 很清楚“ 这里面"source = " + source;这一句又会调用source这一变量(属于WaterSource类)中的
public String toString() { return s; }
而s的初始值是 Constructed ”
 
不过在"source = " + source; 这一句里,如果调用的是source这一变量的toString method, 那么不应该写成
"source = " +source.toString(); 么?
难道source可以被默认成source.toString()?
 
PS:其实这一章的标题是reusing class 和composition syntax, 一直高不懂什么意思?没看出来这个例子和composition 有什么关系。。
[about:home (8-16 15:32, Long long ago)] [ 传统版 | sForum ][登录后回复]5楼

(引用 小妖霖霖:前面那一大段吓到我了……想说,不是问java来着吗= =)学好java来华新抓虫。。。。[about:home (8-16 15:41, Long long ago)] [ 传统版 | sForum ][登录后回复]6楼

(引用 about:home:谢谢 很清楚“ 这里面"source = " + source;这一句又会调用source这一变量(属于WaterSource类)中的 public String toString() { return ...)我也不是很清楚 求高手啊。。。。不过这段代码确实是表达“composition合成”的意思吧
就是利用已有的类,组成新的类啊
就是SprinklerSystem里用到了watersource
[月之女祭司 (8-16 15:49, Long long ago)] [ 传统版 | sForum ][登录后回复]7楼

(引用 about:home:谢谢 很清楚“ 这里面"source = " + source;这一句又会调用source这一变量(属于WaterSource类)中的 public String toString() { return ...)这些都可以在网上查到的http://en.wikipedia.org/wiki/Object_composition
http://docs.oracle.com/javase/6/docs/api/
 

[Pokka (8-16 16:08, Long long ago)] [ 传统版 | sForum ][登录后回复]8楼

(引用 月之女祭司:不知道有没解释对SprinklerSystem类里面定义了soure这一变量 private WaterSource source = new WaterSource(); 也就是说source 这个变量...)+1我也是这么理解的[yuwu (8-16 16:11, Long long ago)] [ 传统版 | sForum ][登录后回复]9楼

(引用 about:home:学好java来华新抓虫。。。。)华新好像是PHP的。。。。。。。。[济癫 (8-16 16:12, Long long ago)] [ 传统版 | sForum ][登录后回复]10楼

(引用 about:home:谢谢 很清楚“ 这里面"source = " + source;这一句又会调用source这一变量(属于WaterSource类)中的 public String toString() { return ...)java中对String overload了'+'这个运算符当'+'右侧不是String时,会主动调用该Object的toString()方法[zhj (8-16 16:31, Long long ago)] [ 传统版 | sForum ][登录后回复]11楼

(引用 Pokka:这些都可以在网上查到的http://en.wikipedia.org/wiki/Object_composition http://docs.oracle.com/javase/6/docs/api/   ...)好像理解错你的问题了应该是这两个连接
http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.18.1

http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.1.11
 [本文发送自华新手机Wap版] [Pokka (8-16 16:56, Long long ago)] [ 传统版 | sForum ][登录后回复]12楼

(引用 Pokka:好像理解错你的问题了应该是这两个连接 http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.18.1 http://docs.oracl...)谢谢 @pokka @zhj @月之女祭祀 明白了[about:home (8-16 22:14, Long long ago)] [ 传统版 | sForum ][登录后回复]13楼


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